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University of KwaZulu-Natal
1.
Hoosen, Zayd Goolam.
Defining the spectral characteristics of rocks within the Mambulu Complex, Natal Belt, South Africa.
Degree: MS, Geology, 2013, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/9739 
► Field and laboratory spectroscopy are sub-fields of remote sensing, where the radiometric data of materials are individually measured either where the materials occur in situ…
(more)
▼ Field and laboratory spectroscopy are sub-fields of remote sensing, where the radiometric data of materials are individually measured either where the materials occur in situ or in a controlled laboratory environment. Both applications require the use of a spectroradiometer to record this reflected electromagnetic radiation. The spectral properties of rocks from the Mambulu Complex in the Natal Belt have not been studied previously. Four dominant rock types, namely, massif-type anorthosite, leuco-gabbro, pyroxenite and magnetitite were sampled from the Mambulu Complex and their spectral reflectances measured. Absorption features were determined after continuum removal was applied to the spectra.
Anorthosite showed absorption features at 480-490, 592, 603, 608, 627-726, 765, 1410, 1905-1955, 2200, 2250 and 2330nm. For leuco-gabbro absorption features were observed at 481, 950-1010, 1407, 1917, 2206, 2252, and 2300-2340nm. Magnetitite displayed absorption features at 414, 460-515, 620-715, 982, 1380-1480, 1800, 1905-1930 and 2145-2330nm. For medium-grained pyroxenite absorption features were present at 410-420, 483, 680, 977-993, 1410-1415, 1800, 1920, 2205, 2250, 2307, 2400 and 2430nm. Coarse-grained pyroxenite showed absorption features at 460-727, 979, 1000, 1401, 1422, 1800, 1913, 1930, 2203, 2258, 2321, 2388 and 2421nm. ANOVAs and Bonferroni tests were applied to the spectral data to calculate significant spectral differences and between which pairs of rocks these significant differences occurred. Results showed that there were significant spectral differences between all the rock types of the Mambulu Complex. The variability of spectral characteristics within rock species was attributed to the difference in composition of fresh and weathered surfaces; and the significant spectral differences between rock samples can be attributed primarily to differences in mineral composition.
Advisors/Committee Members: McCourt, Stephen (advisor), Ahmed, Fethi B (advisor).
Subjects/Keywords: Geology.
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APA (6th Edition):
Hoosen, Z. G. (2013). Defining the spectral characteristics of rocks within the Mambulu Complex, Natal Belt, South Africa. (Masters Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/9739
Chicago Manual of Style (16th Edition):
Hoosen, Zayd Goolam. “Defining the spectral characteristics of rocks within the Mambulu Complex, Natal Belt, South Africa.” 2013. Masters Thesis, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/9739.
MLA Handbook (7th Edition):
Hoosen, Zayd Goolam. “Defining the spectral characteristics of rocks within the Mambulu Complex, Natal Belt, South Africa.” 2013. Web. 05 Dec 2019.
Vancouver:
Hoosen ZG. Defining the spectral characteristics of rocks within the Mambulu Complex, Natal Belt, South Africa. [Internet] [Masters thesis]. University of KwaZulu-Natal; 2013. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/9739.
Council of Science Editors:
Hoosen ZG. Defining the spectral characteristics of rocks within the Mambulu Complex, Natal Belt, South Africa. [Masters Thesis]. University of KwaZulu-Natal; 2013. Available from: http://hdl.handle.net/10413/9739
University of KwaZulu-Natal
2.
Naicker, Sivashni.
Conventional hydrogeological, hydrochemical and environmental isotope study of the Sandspruit River Catchment, Berg River Basin, South Africa.
Degree: MS, Geology, 2013, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/9773
► The Sandspruit River catchment, found within the heart of the Swartland region is infamous for wheat and wine production. Variable groundwater quality and low productivity…
(more)
▼ The Sandspruit River catchment, found within the heart of the Swartland region is infamous
for wheat and wine production. Variable groundwater quality and low productivity is
encountered within the folded and fractured Malmesbury Group aquifer, whilst the most
productive and better quality groundwater is found within the Table Mountain Group
sandstone. The Sandspruit catchment (a tributary of the Berg River) represents a drainage
system, whereby saline groundwater with TDS up to 10870 mg/l, and EC up to 2140 mS/m
has been documented. The catchment belongs to the winter rainfall region with precipitation
seldom exceeding 400mm/yr, as such, groundwater recharge occurs predominantly from
May to August. Recharge estimation using the catchment water-balance method, chloride
mass balance method, and qualified guesses produced recharge rates between 8-70 mm/yr.
To understand the origin, occurrence and dynamics of the saline groundwater, a coupled
analysis of major ion hydrochemistry and environmental isotopes (δ¹⁸O, δ²H and ³H) data
supported by conventional hydrogeological information has been undertaken. Research data
were collected in three seasonal field sampling campaigns within the study catchment.
These spatial and multi-temporal hydrochemical and environmental isotope data provided
insight into the origin, mechanisms and spatial evolution of the groundwater salinity. These
data also illustrate that the saline groundwater within the catchment can be attributed to the
combined effects of evaporation, salt dissolution, and groundwater mixing. The
geology
together with the local and regional faults control the chemistry of the groundwater, whereby
relatively fresh groundwater can be observed in certain direct recharge areas. The salinity of
the groundwater tends to vary seasonally and evolves in the direction of groundwater flow.
The stable isotope signatures further indicate two possible mechanisms of recharge; namely,
(1) a slow diffuse type modern recharge through a relatively low permeability material as
explained by heavy isotope signal and (2) a relatively quick recharge prior to evaporation
from a distant high altitude source as explained by the relatively depleted isotopic signal and
sub-modern to old tritium values. A conceptual hydrogeological model based on the
hydrogeological, hydrochemical, and environmental isotope data was developed for the
Sandspruit catchment. This model, together with statistical and groundwater quality analysis
has lead to the development of a proposed local optimized monitoring scheme for the
catchment.
Advisors/Committee Members: Demlie, Molla B (advisor).
Subjects/Keywords: Geology.
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APA ·
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APA (6th Edition):
Naicker, S. (2013). Conventional hydrogeological, hydrochemical and environmental isotope study of the Sandspruit River Catchment, Berg River Basin, South Africa. (Masters Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/9773
Chicago Manual of Style (16th Edition):
Naicker, Sivashni. “Conventional hydrogeological, hydrochemical and environmental isotope study of the Sandspruit River Catchment, Berg River Basin, South Africa.” 2013. Masters Thesis, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/9773.
MLA Handbook (7th Edition):
Naicker, Sivashni. “Conventional hydrogeological, hydrochemical and environmental isotope study of the Sandspruit River Catchment, Berg River Basin, South Africa.” 2013. Web. 05 Dec 2019.
Vancouver:
Naicker S. Conventional hydrogeological, hydrochemical and environmental isotope study of the Sandspruit River Catchment, Berg River Basin, South Africa. [Internet] [Masters thesis]. University of KwaZulu-Natal; 2013. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/9773.
Council of Science Editors:
Naicker S. Conventional hydrogeological, hydrochemical and environmental isotope study of the Sandspruit River Catchment, Berg River Basin, South Africa. [Masters Thesis]. University of KwaZulu-Natal; 2013. Available from: http://hdl.handle.net/10413/9773
University of KwaZulu-Natal
3.
Walker, Shonagh.
Characterisation of geotechnical, geochemical and metallurgical properties for mine-to-mill optimisation at Sandsloot open pit platinum mine, South Africa.
Degree: MS, Geology, 2008, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/1039
► Sandsloot open pit mine extracts platinum, copper and nickel from the Platreef orebody in the Northern Limb of the Bushveld Complex. At present, it is…
(more)
▼ Sandsloot open pit mine extracts platinum, copper and nickel from the Platreef orebody in the Northern Limb of the Bushveld Complex. At present, it is the world's largest open pit platinum mine, but it is one of the smaller of six pits to be mined in this area by Potgietersrust Platinums Limited (PPRust). As mining progresses and the mine operations expand, sound knowledge of the subsurface ground, the orebody properties and their performance in the processing plant is imperative. An accurately characterised orebody, in terms of its geotechnical, geochemical and metallurgical properties, will facilitate the development of appropriate and cost effective mining practices and processing plant design. It will improve the prediction and performance of materials in each of the steps involved in converting the orebody rock mass into a concentrate /marketable product, which ultimately leads to mine-to-mill optimisation. This dissertation has focused on the geotechnical and metallurgical strength properties of the Platreef orebody at Sandsloot; the geochemical properties of the various lithologies and defined for each orebody rock type the associations and correlations within and between these properties. The petrography of the orebody material was studied to identify and classify the rock types. A rigorous testing programme was conducted and an extensive database of petrographic, geotechnical, geochemical and metallurgical information was assembled. The corresponding results within and across the different studies were grouped together and statistical analysis and interrogation of the data sets were performed. The research identified diverse rock types with contrasting physical properties in the Sandsloot open pit orebody. For each of the rock types the distinguishing characteristics and the variations in properties were identified. Significant differences and relationships between rock types for each property were assessed for predictability in mining. Statistical associations and correlations between the properties of each study were defined and models for predicting strength and rock type were developed.
Subjects/Keywords: Geology.
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APA (6th Edition):
Walker, S. (2008). Characterisation of geotechnical, geochemical and metallurgical properties for mine-to-mill optimisation at Sandsloot open pit platinum mine, South Africa. (Masters Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/1039
Chicago Manual of Style (16th Edition):
Walker, Shonagh. “Characterisation of geotechnical, geochemical and metallurgical properties for mine-to-mill optimisation at Sandsloot open pit platinum mine, South Africa.” 2008. Masters Thesis, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/1039.
MLA Handbook (7th Edition):
Walker, Shonagh. “Characterisation of geotechnical, geochemical and metallurgical properties for mine-to-mill optimisation at Sandsloot open pit platinum mine, South Africa.” 2008. Web. 05 Dec 2019.
Vancouver:
Walker S. Characterisation of geotechnical, geochemical and metallurgical properties for mine-to-mill optimisation at Sandsloot open pit platinum mine, South Africa. [Internet] [Masters thesis]. University of KwaZulu-Natal; 2008. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/1039.
Council of Science Editors:
Walker S. Characterisation of geotechnical, geochemical and metallurgical properties for mine-to-mill optimisation at Sandsloot open pit platinum mine, South Africa. [Masters Thesis]. University of KwaZulu-Natal; 2008. Available from: http://hdl.handle.net/10413/1039
University of KwaZulu-Natal
4.
Krynauw, Johannes Reynhardt.
The petrology and geochemistry of intrusions at selected nunataks in the Ahlmannryggen and Giaeverryggen, western Dronning Maud Land, Antarctica.
Degree: PhD, Geology, 2014, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/11570
► The mid-Proterozoic Borgmassivet intrusions of western Dronning Maud Land intrude Archaean granites and a volcano-sedimentary sequence, the Ritscherflya Supergroup. They are SiO2-rich ultramafic to mafic…
(more)
▼ The mid-Proterozoic Borgmassivet intrusions of western Dronning Maud Land
intrude Archaean granites and a volcano-sedimentary sequence, the Ritscherflya
Supergroup. They are SiO2-rich ultramafic to mafic tholeiitic rocks which
occur as layered bodies of unknown dimensions and sills up to 400 m thick.
This thesis records detailed field, petrographic and whole rock geochemical
studies on Borgmassivet intrusions at three widely-spaced localities within an
area of approximately 20 000 km in the Ahlmannryggen and Giaeverryggen.
Annandagstoppane-Juletoppane-Forstefjell area: The Annandagstoppane
intrusions form part of a layered body or bodies, of which only a small part
is exposed. They consist of a medium-grained 'main suite ' of gabbronorites
and minor anorthosites, and a Iyounger suite ' of quartz diorite pegmatites,
basaltic dykes, fine- to medium-grained gabbroic sills and minor albitite
veins. The main suite rocks are ortho-cumulates in which plagioclase,
orthopyroxene and clinopyroxene were primocrysts which crystallized in situ.
The dykes and sills show typical basaltic and doleritic textures. Geochemical
evidence suggests that the main and younger suites may be consanguineous.
Robertskollen-Krylen area: The layered complex at Robertskollen
comprises a lower, rhythmically layered ultramafic unit, overlain by a mafic
unit. Olivine, orthopyroxene and clinopyroxene are the dominant cumulus
phases in the ultramafic rocks, whereas plagioclase, orthopyroxene and
clinopyroxene fractionation occurred during crystallization of the mafic
rocks. Metastable co-existence of quartz with olivine and anomalous
incompatible trace element characteristics of the Robertskollen complex
suggest contamination of the magma(s) by crustal material. The Krylen
intrusions show petrographic and geochemical characteristics similar to those
of the main suite at Juletoppane. A felsic dyke at Krylen may represent a
rheomorphic product derived from Ritscherflya sediments.
(iii) Grunehogna-Jekselen area: The Grunehogna sill is a medium-grained
diorite of unknown thickness, characterized by varying amounts of plagioclase
and amphibole and a high Fe-Ti oxide content. It is overlain by a 50 m-thick
quartz diorite pegmatite. The overlying 400 m-thick Kullen sill varies in
composition from gabbronorite to gabbro and diorite and shows evidence for
contamination by crustal material. Vugs, evidence for fusion, destruction of
sedimentary structures and deformation in sedimentary contact zones and
xenoliths and the abundance of pegmatites suggest that the sills intruded wet,
unconsolidated or partially lithified sediments. The Jekselen complex
consists of quartz diorites intruding Ritscherflya sediments. Amygdales in
the upper zones of the complex indicate the subvolcanic nature of the
intrusion.
Major, trace and rare earth element data of the Borgmassivet intrusions and
the Straumsnutane basalts (Watters, 1969a, 1969b, 1972, pers. comm., 1985) show
a strong regional coherence, indicating that the rocks may be consanguineous.
Abundance ratio patterns…
Advisors/Committee Members: Hunter, Don R (advisor), Wilson, Allen H (advisor).
Subjects/Keywords: Geology.
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Krynauw, J. R. (2014). The petrology and geochemistry of intrusions at selected nunataks in the Ahlmannryggen and Giaeverryggen, western Dronning Maud Land, Antarctica. (Doctoral Dissertation). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/11570
Chicago Manual of Style (16th Edition):
Krynauw, Johannes Reynhardt. “The petrology and geochemistry of intrusions at selected nunataks in the Ahlmannryggen and Giaeverryggen, western Dronning Maud Land, Antarctica.” 2014. Doctoral Dissertation, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/11570.
MLA Handbook (7th Edition):
Krynauw, Johannes Reynhardt. “The petrology and geochemistry of intrusions at selected nunataks in the Ahlmannryggen and Giaeverryggen, western Dronning Maud Land, Antarctica.” 2014. Web. 05 Dec 2019.
Vancouver:
Krynauw JR. The petrology and geochemistry of intrusions at selected nunataks in the Ahlmannryggen and Giaeverryggen, western Dronning Maud Land, Antarctica. [Internet] [Doctoral dissertation]. University of KwaZulu-Natal; 2014. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/11570.
Council of Science Editors:
Krynauw JR. The petrology and geochemistry of intrusions at selected nunataks in the Ahlmannryggen and Giaeverryggen, western Dronning Maud Land, Antarctica. [Doctoral Dissertation]. University of KwaZulu-Natal; 2014. Available from: http://hdl.handle.net/10413/11570
University of KwaZulu-Natal
5.
Moseki, Molatlhegi Larty Lostman.
The geology and tectonic setting of the Shashe-Foley-Tonota area (Central Motloutse Complex), NE Botswana.
Degree: Geology, 2015, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/11830
► The well-developed NE-SW structural grain of the Shashe, Foley and Tonota (SFT) region is used to separate it from the NW-SE trending structures that characterise…
(more)
▼ The well-developed NE-SW structural grain of the Shashe, Foley and Tonota (SFT) region is used to separate it from the NW-SE trending structures that characterise the Matsitama belt and adjacent area previously described as the Shashe belt. The study area is divided into 4 domains showing different geometrical and geological characteristics. Domain 2 (Shashe Dam shear zone) and Domain 3 lie to the NW and SE of the metasedimentary belt (Domain1). Domain 4 (the Gulushabe shear zone) is to the NE of the metasedimentary rocks. The rocks are characterised by NNE to ENE striking foliation present in both the the metasedimentary belt (supracrustal rocks) and the granitoid rocks. The metasedimentary rocks are deformed into large map scale NE to ENE trending folds structures (the Foley synform and the Gulushabe antiform) that deform bedding (So) and foliation (S1). The deformation involved NW-SE or NNW-SSE horizontal compression and is explained by two main episodes of NE-ENE coaxial (F1/F2) folding followed by a younger phase (F3) that produced NNE trending folds. The effect of F3 folding is reflected in stereographic plots of poles to bedding and foliation in Domains 1and Domain 2 which indicate folds plunging to the NNE. The foliation and the shape of deformed pebbles in the pebbly-quartzite is a product of oblate strain (flattening) in response to NW or NNW horizontal compression. This pebble elongation is considered to reflect the end result of F1 and F2 folding produced by oblate strain. Likewise, the shape of the K-feldspar megacrysts in the megacrystic granite gneiss in Domain 2 can be attributed to flattening (pure shear) rather than simple shear. The kinematics of the deformation features recognized are not compatible with the accretion-linked models proposed by previous workers for the SW margin of the Zimbabwe craton.
Field based intrusive relationship studies indicate the granitoid gneisses were derived from igneous protoliths. Neoarchaean U-Pb zircon ages obtained confirm the order of granitoid emplacement obtained from field based studies. The ages obtained are 2724±48 Ma (Tonota biotite gneiss), 2698.9±9.2Ma (tonalite gneiss), 2647±24 Ma (megacrystic granite gneiss) and 2631.5±4 Ma (pink granite). Granitoid magmatism occurred between about 2724 Ma (biotite gneiss) and 2631 Ma (pink granite), a duration of ~ 94 Ma. The foliation (S1) in the tonalitic gneiss (2699 Ma) and the megacrystic gneiss (2647 Ma) predate intrusion of the pink gneissic granite (2631 Ma). Since S1 in the granitoid rocks is equated with S2 in the metasedimentary sequence, deformation fabrics in both the metasedimentary sequence and granitoid rocks predate 2631 Ma. The U-Pb ages obtained in this study, together with previous U-Pb zircon ages for granitoids from adjacent parts of the Motloutse Complex, the Limpopo belt and the Mosetse Complex indicate a geotectonic link between the terranes during the interval 2.6-2.7 Ga
Domain 3 fabric is parallel to large scale ENE-WSW trending ductile dextral strike-slip shear zones (Regional D4…
Advisors/Committee Members: McCourt, Stephen (advisor).
Subjects/Keywords: Geology.
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APA (6th Edition):
Moseki, M. L. L. (2015). The geology and tectonic setting of the Shashe-Foley-Tonota area (Central Motloutse Complex), NE Botswana. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/11830
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Moseki, Molatlhegi Larty Lostman. “The geology and tectonic setting of the Shashe-Foley-Tonota area (Central Motloutse Complex), NE Botswana.” 2015. Thesis, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/11830.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moseki, Molatlhegi Larty Lostman. “The geology and tectonic setting of the Shashe-Foley-Tonota area (Central Motloutse Complex), NE Botswana.” 2015. Web. 05 Dec 2019.
Vancouver:
Moseki MLL. The geology and tectonic setting of the Shashe-Foley-Tonota area (Central Motloutse Complex), NE Botswana. [Internet] [Thesis]. University of KwaZulu-Natal; 2015. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/11830.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moseki MLL. The geology and tectonic setting of the Shashe-Foley-Tonota area (Central Motloutse Complex), NE Botswana. [Thesis]. University of KwaZulu-Natal; 2015. Available from: http://hdl.handle.net/10413/11830
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of KwaZulu-Natal
6.
Jele, Nkosinathi Luvuno.
The genesis of the quartz-sericite schists of the Toggekry Formation, Nondweni Greenstone Belt, South Africa.
Degree: Geology, 2015, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/11844
► The aim of this study was to investigate the origin of sulphide-bearing quartz sericite-schists of the Toggekry Formation in the Archaean Nondweni greenstone belt (NGB)…
(more)
▼ The aim of this study was to investigate the origin of sulphide-bearing quartz sericite-schists of
the Toggekry Formation in the Archaean Nondweni greenstone belt (NGB) in the SE Kaapvaal
craton, and to compare them with similar units in the Barberton greenstone belt (BGB).
Geochemical studies reveal that the quartz-sericite schists had a rhyolite protolith. These rocks
were subjected to two major deformation phases. D1 involved thrusting and stacking of the
greenstone stratigraphy while D2 formed the large syncline structure of the greenstone belt.
Within the study area, the F2 buckling mechanism seems to have been tangential longitudinal
strain. Peak metamorphism occurred after D2 at 3230 Ma when the Mvunyana granodiorite
intruded. The extensive alteration of the schists is interpreted as being partially due to the
deformation and metamorphism but mainly because of the position of the schists in the contact
metamorphic aureole of the Mvunyana granodiorite.
The tholeiitic and calc-alkaline signatures of both the mafic and felsic rocks of the Toggekry
Formation indicate that they formed in a back-arc setting. The enrichment in LREE relative to
HREE that the rocks display is characteristic of crustal contamination and/or subduction zone
magmas, enriched mantle source or small degrees of melting. The positive Pb anomalies and
negative Nb-Ta are characteristic of subduction zone processes and indicate crustal involvement
in the magma process. Epsilon Hf data suggests derivation either from a depleted mantle source
with contamination by older continental crust or from a depleted mantle at an earlier age
followed by re-melting.
The Toggekry Formation has an age of 3.54 Ga and is indistinguishable in age to the Theespruit
Complex of BGB. Both sequences are lithologically similar and interpreted as forming in backarc
settings. However significant geochemical differences indicate that they formed in coeval
but separate basins. Four models are proposed to account for this. The peak metamorphic event
at ca. 3.2 Ga in both areas is considered to reflect an accretionary event during the formation of the Kaapvaal craton.
Advisors/Committee Members: Watkeys, Michael K (advisor).
Subjects/Keywords: Geology.
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APA ·
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APA (6th Edition):
Jele, N. L. (2015). The genesis of the quartz-sericite schists of the Toggekry Formation, Nondweni Greenstone Belt, South Africa. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/11844
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jele, Nkosinathi Luvuno. “The genesis of the quartz-sericite schists of the Toggekry Formation, Nondweni Greenstone Belt, South Africa.” 2015. Thesis, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/11844.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jele, Nkosinathi Luvuno. “The genesis of the quartz-sericite schists of the Toggekry Formation, Nondweni Greenstone Belt, South Africa.” 2015. Web. 05 Dec 2019.
Vancouver:
Jele NL. The genesis of the quartz-sericite schists of the Toggekry Formation, Nondweni Greenstone Belt, South Africa. [Internet] [Thesis]. University of KwaZulu-Natal; 2015. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/11844.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jele NL. The genesis of the quartz-sericite schists of the Toggekry Formation, Nondweni Greenstone Belt, South Africa. [Thesis]. University of KwaZulu-Natal; 2015. Available from: http://hdl.handle.net/10413/11844
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of KwaZulu-Natal
7.
Vicente, Enoque Mendes.
Aspects of the engineering geology of Maputo City, Mozambique.
Degree: PhD, Geology, 2011, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/8078
► The geological formations of Maputo City, which are mainly unconsolidated materials with soil like properties, are described in terms of their engineering geological and geotechnical…
(more)
▼ The geological formations of Maputo City, which are mainly unconsolidated materials with soil
like properties, are described in terms of their engineering geological and geotechnical
characteristics with relevance to their distribution patterns and spatial trends. Problematic
conditions such as collapse potential characteristics, loose aeolian sand dune deposits and loose
sand plains characterize many of the materials. The geological characteristics combined with
anthropogenic interference such as intensive urbanization with inappropriate land use,
construction in sensitive areas like steep sandy slopes has led to many problems including slope
stability. Foundation problems with building settlement and gully erosion also occur. The aim
of this research was to study the engineering geological characteristics and the geotechnical
properties of the geological formations of Maputo City and various related problems. Special
relevance has been given to the understanding of three specific problems: building damage,
gully erosion and slope instability.
The geological formations are predominantly sandy (coarse to very fine sand) with very low
clay content, are non-plastic and are classified as from the group SP-SM which are poorlygraded
sand with silt. The majority of the materials are loose and normally consolidated with a
high level of residual strength. Assessment of collapse settlement through double consolidation
technique indicated soil compressibility and significant sensibility to collapse upon wetting.
Truly collapsible soils that show full collapse of the soil structure were identified in 33% of the
tested materials where the highest collapse behaviour reached values above 5%, predicted to
cause moderate trouble in foundation design. Some of the bonded materials are bonded (evident
in 67% of samples tested). Bonding was confirmed by comparing the compressibility of the
undisturbed and remoulded samples. The remoulded samples showed a significantly higher
compression than that of the bonded materials as part of the stress applied is carried by the
bonds themselves, as the bonded material is stiffer than the same without bonds. The curves of
the remoulded samples were used to establish the limit between the stable and meta-stable states
of the material.
A qualitative evaluation of the erosion susceptibility was investigated by physical tests such as
the crumb test, shear strength and chemical indicators while a quantitative evaluation of the
erodibility characteristics was obtained using a flume test. Some correlations were found
between the results of various methods. Almost all samples that were found to be dispersive
with ESP were also dispersive with TDS vs. %Na and SAR. Results of the flume erodibility
test have very little correlation with the chemical properties related to dispersion revealing that
the erosion susceptibility and gullying in Maputo City have more relation to the physical
processes than to the dispersion related chemical properties of the soils. The positive
identification of dispersive and…
Advisors/Committee Members: Schreiner, Deneys (advisor), Jermy, Colin A (advisor), Richards., Nick (advisor).
Subjects/Keywords: Geology.
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APA (6th Edition):
Vicente, E. M. (2011). Aspects of the engineering geology of Maputo City, Mozambique. (Doctoral Dissertation). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/8078
Chicago Manual of Style (16th Edition):
Vicente, Enoque Mendes. “Aspects of the engineering geology of Maputo City, Mozambique.” 2011. Doctoral Dissertation, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/8078.
MLA Handbook (7th Edition):
Vicente, Enoque Mendes. “Aspects of the engineering geology of Maputo City, Mozambique.” 2011. Web. 05 Dec 2019.
Vancouver:
Vicente EM. Aspects of the engineering geology of Maputo City, Mozambique. [Internet] [Doctoral dissertation]. University of KwaZulu-Natal; 2011. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/8078.
Council of Science Editors:
Vicente EM. Aspects of the engineering geology of Maputo City, Mozambique. [Doctoral Dissertation]. University of KwaZulu-Natal; 2011. Available from: http://hdl.handle.net/10413/8078
University of KwaZulu-Natal
8.
Roelofse, Tiani.
Mineralogy and geochemistry of clay sediments in pans of the Northern Cape Province, South Africa.
Degree: MS, Geology, 2010, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/5355
► This thesis reports the results of a mineralogical and geochemical study of pans situated in the Northern Cape Province with special emphasis on the clay…
(more)
▼ This thesis reports the results of a mineralogical and geochemical study of pans situated in the
Northern Cape Province with special emphasis on the clay minerals. From east to west the
depth and size of the pans increase and associated with this increased maturity the abundance
of salt (halite and thenardite) and the quantity of green sediment are also enhanced.
Chemically the sediments are dominated by SiO2 that also dilutes Fe2O3, K2O, Na2O, Al2O3
and MgO (when associated with dolomite) concentrations. Authigenic calcite, dolomite,
analcime and loughlinite (Na-sepiolite) occur in some of the pans to the west and FTIR
spectrometry indicates that all the pans host glauconite and/or celadonite. However, smectite,
illite/smectite interstratification, kaolinite and/or chlorite and loughlinite only occur in some
pans. The glauconite and/or celadonite does not occur as discrete mineral grains, but forms
part of the fine-grained matrix common to all of the pans and no evidence of any precursor
minerals were observed. The pan environment appears to present a closed, saline setting that
is conducive for the direct precipitation of a mica with a chemical composition between that
of glauconite and celadonite. The influence of the water-table on the formation of the
glauconite and/or celadonite appears to be significant, as the highest abundance of salt is
invariably associated with the position in the profile where the sediment appears to reach its
most intense green colour. In the case of Koi Pan, the celadonite component of the solid
solution seems to increase as the green colour intensifies. Loughlinite in Koi Pan and Brak
Pan sediments also appear to be authigenic and it is suggested that it forms after precipitation
of low Mg calcite that leads to Mg enrichment of the system and consequent sepiolite
formation associated with minor dolomite. Thermoluminescence ages obtained from the Koi
Pan sediment range between 37ka and 48ka before present at a depth of ~120cm below the
surface, while for Brak Pan, at roughly the same depth, an age of between 110ka and older
than 150ka before present was obtained. This may suggest different sedimentation rates in the
pans or much younger ages and thus faster formation of glauconite and/or celadonite in Koi
Pan since it is suggested that the mineral is authigenic.
Advisors/Committee Members: Cloete, M (advisor), Dunlevey, J. M (advisor).
Subjects/Keywords: Geology.
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Roelofse, T. (2010). Mineralogy and geochemistry of clay sediments in pans of the Northern Cape Province, South Africa. (Masters Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/5355
Chicago Manual of Style (16th Edition):
Roelofse, Tiani. “Mineralogy and geochemistry of clay sediments in pans of the Northern Cape Province, South Africa.” 2010. Masters Thesis, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/5355.
MLA Handbook (7th Edition):
Roelofse, Tiani. “Mineralogy and geochemistry of clay sediments in pans of the Northern Cape Province, South Africa.” 2010. Web. 05 Dec 2019.
Vancouver:
Roelofse T. Mineralogy and geochemistry of clay sediments in pans of the Northern Cape Province, South Africa. [Internet] [Masters thesis]. University of KwaZulu-Natal; 2010. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/5355.
Council of Science Editors:
Roelofse T. Mineralogy and geochemistry of clay sediments in pans of the Northern Cape Province, South Africa. [Masters Thesis]. University of KwaZulu-Natal; 2010. Available from: http://hdl.handle.net/10413/5355
University of KwaZulu-Natal
9.
Young, Paul Michael.
An integrated marine GIS bathymetric dataset for KwaZulu-Natal.
Degree: MS, Geology, 2009, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/8294
► Bathymetry forms the basis for studies in marine geology, biology and oceanography and is essential for the Extended Continental Shelf Claim (ECSC), a legal framework…
(more)
▼ Bathymetry forms the basis for studies in marine
geology, biology and oceanography and is
essential for the Extended Continental Shelf Claim (ECSC), a legal framework established by
the United Nations (UN) to encourage a nation’s governance and management of its marine
resources. This research provides the first digital, integrated, Geographical Information System
(GIS) based bathymetric dataset for KwaZulu-Natal that combines near-shore and deep-water
datasets for use in marine sciences.
A total of 32 datasets acquired using a range of techniques and instruments between 1911 and
2006 were considered. Twenty nine of these were near-shore datasets with data densities
varying from 6 to 57 406 points per km2. Of these, 15 were acquired by the Council for
Geoscience (CGS), 9 by the South African Navy and 5 by the African Coelacanth Ecosystem
Programme (ACEP). Two of the remaining 3 deep-water datasets were grids acquired digitally
for this work, while the third was a digitised contour dataset. The 2003 General Bathymetric
Chart of the Oceans (GEBCO) grid is based on digitised point and contour data with a point
every 1 852 m, while the 1997 Smith and Sandwell grid is based on predicted satellite altimetry
data with a point every 3 704. The third deep-water dataset was digitised from a northern Natal
Valley bathymetric contour map developed in 1978 and has data densities varying from 0.02 to
1 point per km2.
Datasets were prioritised in the following descending order of quality defined by the available
metadata: multi-beam echo-sounder-derived datasets, followed by single-beam
echo-sounder-derived datasets and lastly lead line datasets. The digitised northern Natal
Valley bathymetric contour dataset after Dingle et al. (1978) was considered authoritative for
the deep-water areas, while the 2-minute interval Smith and Sandwell satellite derived
bathymetry dataset was integrated south of 31o S where no other dataset coverage existed.
Availability of good metadata describing bathymetric dataset positioning and depth measuring
instruments were essential. Where good metadata did exist, interrogation, integration and
quality control were straightforward. However, where the year of acquisition and depth
measuring instrument type were the only available metadata, information about positioning and
depth measuring instruments were inferred. The digitised northern Natal Valley bathymetric
contour dataset offered the best deep-water coverage and was derived from heterogeneous
point datasets about which no metadata was available. Metadata for the Smith and Sandwell
satellite derived bathymetric dataset suggested limited ship track data control for the study
area, while it was known to contain noise caused by an unquantified, rough sea state.
The integration process was successful but noticeable artefacts were recognised. Concentric
contour artefacts were present where the digitised northern Natal Valley bathymetric contour
dataset and the South African Navy Admiralty Fair Chart 34 dataset were integrated. Regional
conjoined arc-like…
Advisors/Committee Members: Uken, Ronald (advisor), Ramsay, Peter John (advisor), Whitmore, Greg P (advisor).
Subjects/Keywords: Geology.
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Young, P. M. (2009). An integrated marine GIS bathymetric dataset for KwaZulu-Natal. (Masters Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/8294
Chicago Manual of Style (16th Edition):
Young, Paul Michael. “An integrated marine GIS bathymetric dataset for KwaZulu-Natal.” 2009. Masters Thesis, University of KwaZulu-Natal. Accessed December 05, 2019.
http://hdl.handle.net/10413/8294.
MLA Handbook (7th Edition):
Young, Paul Michael. “An integrated marine GIS bathymetric dataset for KwaZulu-Natal.” 2009. Web. 05 Dec 2019.
Vancouver:
Young PM. An integrated marine GIS bathymetric dataset for KwaZulu-Natal. [Internet] [Masters thesis]. University of KwaZulu-Natal; 2009. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10413/8294.
Council of Science Editors:
Young PM. An integrated marine GIS bathymetric dataset for KwaZulu-Natal. [Masters Thesis]. University of KwaZulu-Natal; 2009. Available from: http://hdl.handle.net/10413/8294
Colorado State University
10.
Pyanoe, Dominic.
Fluid inclusion and metal ratio analysis of cordilleran Pb-Zn-Cu-(Ag-Au) veins of the Montezuma district| Summit County Colorado, USA.
Degree: 2016, Colorado State University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1606517
► Evidence from fluid inclusion microthermometry in Pb-Zn-Cu-(Ag-Au) veins and district scale metal ratio zonation analysis indicate that the Cordilleran veins of the Montezuma mining…
(more)
▼ Evidence from fluid inclusion microthermometry in Pb-Zn-Cu-(Ag-Au) veins and district scale metal ratio zonation analysis indicate that the Cordilleran veins of the Montezuma mining district Summit County, Colorado, USA are indicative of subepithermal setting about a central hydrothermal source. Cordilleran-type polymetallic mineralization is a class of ore deposits that are spatially and temporally related to felsic igneous centers and can also be genetically related to porphyry mineralization (Fontboté and Bendezú, 2009). At Montezuma, the Teritary-aged Montezuma Stock is cross cut by several Cordilleran-type veins and is spatially related to over 80 additional veins hosted in Precambrian country rock. Five stages of mineralization in veins are identified: Stage 1. early quartz-pyrite, Stage 2. barite-incipient base metals Stage 3. base metals, Stage 4. carbonates and Stage 5. late quartz-lead-silver. There is a systematic decline in precipitation temperatures from 341 to 156°C along the progression of the paragenetic sequence, which suggests the waning of a source pluton. District scale metal ratio zonation maps from historical production data support the interpretation of a central magmatic source and that thermal decline is the primary control on ore deposition. Two district scale zones are identified: a copper rich zone (CRZ) in the center of the district, which is surrounded by a copper poor zone (CPZ). With distance from the inferred center of the district, there is a general decline in copper abundance relative to lead and silver. Thermal gradients accompanied by a decrease in metal solubilities are the mechanism for this zonation pattern, but developed late in the paragenesis. Other chemical and physical controls of phase separation, ligand removal, dilution and pH increase are likely present during vein mineralization as well. Approximate salinities ranged from 11.69 to 3.70 wt.% equivalent NaCl and showed less systematic patterns, and may reflect these additional processes. Temperature decline and variable additional depositional processes are consistent with analogous Cordilleran-type vein fields, which have proven links to a magmatic source and possible underlying stockwork porphyry base metal mineralization. Therefore, data from this study indicates that there is most likely porphyry Mo mineralization under the copper rich zone, but this may be sub economic in nature.
Subjects/Keywords: Geology
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APA ·
Chicago ·
MLA ·
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Pyanoe, D. (2016). Fluid inclusion and metal ratio analysis of cordilleran Pb-Zn-Cu-(Ag-Au) veins of the Montezuma district| Summit County Colorado, USA. (Thesis). Colorado State University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1606517
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pyanoe, Dominic. “Fluid inclusion and metal ratio analysis of cordilleran Pb-Zn-Cu-(Ag-Au) veins of the Montezuma district| Summit County Colorado, USA.” 2016. Thesis, Colorado State University. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1606517.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pyanoe, Dominic. “Fluid inclusion and metal ratio analysis of cordilleran Pb-Zn-Cu-(Ag-Au) veins of the Montezuma district| Summit County Colorado, USA.” 2016. Web. 05 Dec 2019.
Vancouver:
Pyanoe D. Fluid inclusion and metal ratio analysis of cordilleran Pb-Zn-Cu-(Ag-Au) veins of the Montezuma district| Summit County Colorado, USA. [Internet] [Thesis]. Colorado State University; 2016. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1606517.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pyanoe D. Fluid inclusion and metal ratio analysis of cordilleran Pb-Zn-Cu-(Ag-Au) veins of the Montezuma district| Summit County Colorado, USA. [Thesis]. Colorado State University; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1606517
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
11.
Njuguna, Wanjiru Margaret.
Mixed silicilcastic-siliceous succession, Miocene Monterey formation, Point Dume to Paradise Cove, Malibu, California.
Degree: 2017, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10240219
► The 752 meter section of the Miocene Monterey exposures between Point Dume and Paradise Cove is described in detail using meter-by-meter Spectral Gamma Ray…
(more)
▼ The 752 meter section of the Miocene Monterey exposures between Point Dume and Paradise Cove is described in detail using meter-by-meter Spectral Gamma Ray data, lithologic descriptions, sandstone analysis (percent sandstone and thin section petrography) and X-ray diffraction data. Samples were analyzed to determine total organic carbon (% TOC) and diatom assemblages. The stratigraphic section is subdivided into four distinct members and is portrayed in a new stratigraphic column. In stratigraphic order, the members are the Dolomitic Phosphatic Shale Member, the Porcelanite and Shale Member, the Mixed Clastics Member and the Cherty Diatomite Member. High TOC values in the Dolomitic Phosphatic Shale range between 4.2 and 7.5%. Opal-CT phase silica occurs in cherts and porcelanite and biogenic Opal-A phase silica occurred in the diatomites. Rocks showing a complete diagenesis to Quartz phase silica are not in the section. Bedding confined fractures and joint sets between different siliceous rocks are abundant in the Porcelanite and Shale Member. The base of the Mixed Clastics member has high energy deposits indicating down-slope movement with major sandstones and conglomerates. The top of the section contains the Cherty Diatomite member and consists of rhythmically bedded pure diatomite, “speckled” beds, muddy diatomites, siliceous/calcareous mudrocks and Opal-CT chert. Dolostone forms a significant component of the rock type throughout the section. The Monterey Formation is found throughout Coastal California and in most of the Neogene sedimentary basins in the State. It is highly petroliferous, forming both the source and reservoir rock. Understanding the exposures in Malibu, CA contributes to the understanding of this economically important formation.
Subjects/Keywords: Geology
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APA (6th Edition):
Njuguna, W. M. (2017). Mixed silicilcastic-siliceous succession, Miocene Monterey formation, Point Dume to Paradise Cove, Malibu, California. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10240219
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Njuguna, Wanjiru Margaret. “Mixed silicilcastic-siliceous succession, Miocene Monterey formation, Point Dume to Paradise Cove, Malibu, California.” 2017. Thesis, California State University, Long Beach. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=10240219.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Njuguna, Wanjiru Margaret. “Mixed silicilcastic-siliceous succession, Miocene Monterey formation, Point Dume to Paradise Cove, Malibu, California.” 2017. Web. 05 Dec 2019.
Vancouver:
Njuguna WM. Mixed silicilcastic-siliceous succession, Miocene Monterey formation, Point Dume to Paradise Cove, Malibu, California. [Internet] [Thesis]. California State University, Long Beach; 2017. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10240219.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Njuguna WM. Mixed silicilcastic-siliceous succession, Miocene Monterey formation, Point Dume to Paradise Cove, Malibu, California. [Thesis]. California State University, Long Beach; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10240219
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Molina Sotelo, Castulo.
Geology and mineralization controls surrounding the Palmarejo mining district - A compilation of remote and hands on exploration techniques.
Degree: 2017, The University of Texas at El Paso
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10246548
► Exploration is the base of the mining industry, and it is often taken as synonymous with "finding a mine". In reality it is a…
(more)
▼ Exploration is the base of the mining industry, and it is often taken as synonymous with "finding a mine". In reality it is a more complex process; where the selection, evaluation, screening and testing of successively smaller areas lead to the discovery of an economic deposit. Once the deposit is found, the economic factors become more important than the geological ones, and then the exploration becomes a tool to give sustainability to the mining operation through time. The silver and gold deposits of the world-class Palmarejo District are typical, intermediate sulfidation-style epithermal, precious metal occurrences, hosted in Cretaceous- to Tertiary-aged volcanic and intrusive rocks of the Lower Volcanic Complex (LVC), and host one of the newest and largest silver and gold producers in Mexico. Using a series of five chapters, three of them focused on the mine, and two at regional level, this author will show the geology and mineralization controls at different scales within the study area. Once the mineralization controls at regional and mine scale are known, the combination of previous knowledge with the right tools, helps the explorer to decide where to, wisely and effectively, spend the resources.
Subjects/Keywords: Geology
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Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Molina Sotelo, C. (2017). Geology and mineralization controls surrounding the Palmarejo mining district - A compilation of remote and hands on exploration techniques. (Thesis). The University of Texas at El Paso. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10246548
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Molina Sotelo, Castulo. “Geology and mineralization controls surrounding the Palmarejo mining district - A compilation of remote and hands on exploration techniques.” 2017. Thesis, The University of Texas at El Paso. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=10246548.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Molina Sotelo, Castulo. “Geology and mineralization controls surrounding the Palmarejo mining district - A compilation of remote and hands on exploration techniques.” 2017. Web. 05 Dec 2019.
Vancouver:
Molina Sotelo C. Geology and mineralization controls surrounding the Palmarejo mining district - A compilation of remote and hands on exploration techniques. [Internet] [Thesis]. The University of Texas at El Paso; 2017. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10246548.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Molina Sotelo C. Geology and mineralization controls surrounding the Palmarejo mining district - A compilation of remote and hands on exploration techniques. [Thesis]. The University of Texas at El Paso; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10246548
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oregon
13.
O'Connell, Brennan.
Sedimentology and depositional history of the Miocene – Pliocene southern Bouse Formation, Arizona and California.
Degree: 2017, University of Oregon
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10248418
► The Miocene to Pliocene southern Bouse Formation preserves a record of depositional environments immediately prior to and during integration of the Colorado River to…
(more)
▼ The Miocene to Pliocene southern Bouse Formation preserves a record of depositional environments immediately prior to and during integration of the Colorado River to the Gulf of California. Uncertainty over Bouse paleoenvironments obscures our understanding of the timing and magnitude of regional uplift, as well as the conditions and processes that were active during integration and early evolution of the Colorado River. Prior studies over the past 20 years have concluded that the southern Bouse Formation accumulated in chain of lakes isolated from the ocean. Sedimentologic analyses presented here aid interpretation of depositional environments and provide evidence for a strong tidal influence on deposition, consistent with a marine interpretation of other prior studies. This interpretation places a critical constrain on the elevation of these deposits at ca. 5 Ma, and suggests post-Miocene uplift of the Lower Colorado River corridor. This thesis includes previously published coauthored material.
Subjects/Keywords: Geology
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APA ·
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Export
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APA (6th Edition):
O'Connell, B. (2017). Sedimentology and depositional history of the Miocene – Pliocene southern Bouse Formation, Arizona and California. (Thesis). University of Oregon. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10248418
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
O'Connell, Brennan. “Sedimentology and depositional history of the Miocene – Pliocene southern Bouse Formation, Arizona and California.” 2017. Thesis, University of Oregon. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=10248418.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
O'Connell, Brennan. “Sedimentology and depositional history of the Miocene – Pliocene southern Bouse Formation, Arizona and California.” 2017. Web. 05 Dec 2019.
Vancouver:
O'Connell B. Sedimentology and depositional history of the Miocene – Pliocene southern Bouse Formation, Arizona and California. [Internet] [Thesis]. University of Oregon; 2017. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10248418.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
O'Connell B. Sedimentology and depositional history of the Miocene – Pliocene southern Bouse Formation, Arizona and California. [Thesis]. University of Oregon; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10248418
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
14.
Brasseaux, Shawn.
The Mississippi River-Gulf Outlet and Land Changes in Louisiana Deltaic Plain, Saint Bernard Parish, Louisiana.
Degree: 2016, University of Louisiana at Lafayette
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10002416
► Louisiana contains approximately 40 percent of the contiguous United States’ wetlands, and as much as 80 percent of America’s coastal land loss occurs there.…
(more)
▼ Louisiana contains approximately 40 percent of the contiguous United States’ wetlands, and as much as 80 percent of America’s coastal land loss occurs there. This land loss is occurring at an astounding rate—a rate that is accelerating. The Mississippi River-Gulf Outlet (MRGO) is a 120-km- (75-mi-) long canal initially dredged in the 1950s and 1960s and maintained by the United States Army Corps of Engineers. It was intended to connect the Port of New Orleans directly to the Gulf of Mexico and bypass the time-consuming, tortuous route via the Mississippi River and Delta. Intially, environmental groups and citizens greatly opposed the MRGO as a potential ecological disaster. While in operation, the channel doubled and even tripled in width in some areas; it merged with Lake Borgne; it amplified storm surge, especially during Hurricanes Betsy and Katrina; and it caused saltwater intrusion in nearby wetlands and forests. Channel dredging ceased after Hurricane Katrina. In 2009, MRGO maritime traffic ended when a rock closure structure was installed. By comparing series of aerial photographs and satellite images, this study will summarize, highlight, and evaluate the land changes associated with the MRGO, with respect to its inland “Mile Markers.” Additionally, this study compares the roles of human activities versus natural processes in causing land loss in the MRGO area. Aerial photographs and satellite images of the MRGO also were compared and contrasted to see what is presently occurring at the channel concerning the closure structure. Lastly, possible solutions are offered for the mitigation of land loss and/or for creating new land area in the region.
Subjects/Keywords: Geology
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APA (6th Edition):
Brasseaux, S. (2016). The Mississippi River-Gulf Outlet and Land Changes in Louisiana Deltaic Plain, Saint Bernard Parish, Louisiana. (Thesis). University of Louisiana at Lafayette. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10002416
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Brasseaux, Shawn. “The Mississippi River-Gulf Outlet and Land Changes in Louisiana Deltaic Plain, Saint Bernard Parish, Louisiana.” 2016. Thesis, University of Louisiana at Lafayette. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=10002416.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Brasseaux, Shawn. “The Mississippi River-Gulf Outlet and Land Changes in Louisiana Deltaic Plain, Saint Bernard Parish, Louisiana.” 2016. Web. 05 Dec 2019.
Vancouver:
Brasseaux S. The Mississippi River-Gulf Outlet and Land Changes in Louisiana Deltaic Plain, Saint Bernard Parish, Louisiana. [Internet] [Thesis]. University of Louisiana at Lafayette; 2016. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10002416.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Brasseaux S. The Mississippi River-Gulf Outlet and Land Changes in Louisiana Deltaic Plain, Saint Bernard Parish, Louisiana. [Thesis]. University of Louisiana at Lafayette; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10002416
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
15.
Kassa, Tesfalidet Ghirmay.
Pore structure of opal-CT and quartz porcelanites, Monterey Formation, California.
Degree: 2016, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10155529
► Secondary and backscattered electron scanning electron microscopy of argon-ion polished or focused-ion beams’ cut surfaces reveal significant differences in pore size, shape and complexity…
(more)
▼ Secondary and backscattered electron scanning electron microscopy of argon-ion polished or focused-ion beams’ cut surfaces reveal significant differences in pore size, shape and complexity between opal-CT and quartz-phase porcelanites, but also between rocks of the same silica phase with distinct silica content or sedimentary fabric. Previous studies of these important petroleum reservoir rocks measured an order-of-magnitude lower permeability in opal-CT than quartz-phase porcelanites. Detrital-poor quartz-phase porcelanite (> 80% silica) has massive or laminated microfabrics. The massive type consists of low-porosity matrix and high-porosity lenticular patches with 17-20% bulk porosity. In contrast, a laminated detrital-poor porcelanite (26% bulk porosity) has ∼100 µm-thick layers that alternate between well connected, highly porous (35% and low-porosity layers (19%) with isolated pores. Massive detrital-rich porcelanites have porosity of 10% with and poor connectivity. Opal-CT porcelanites also have two detrital-poor (>75% silica) and one detrital-rich (<60% silica) microfabrics. One detrital-poor porcelanite with 30% bulk porosity has a pervasive lepispheric fabric in which lepispheric cores and interlepisphere porosity each comprise ∼1/2 of the total porosity (3-138 nm size). Lepisphere core are mostly isolated by a surrounding, virtually pore-free, impermeable mantle. The larger and better-connected interlepisphere pores are formed by larger, crosscutting and radiating bladed crystals. The detrital-poor, opal-CT porcelanite is characterized by extraordinarily large and connected vuggy pores with bulk porosity of 60%. This unique pore structure is associated with silica mobility during stalled burial or tectonic uplift of the opal-CT to quartz transition zone. The third fabric is in detrital-rich opal-CT porcelanite that has 18% bulk porosity with poorly connected pores.
Subjects/Keywords: Geology
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MLA ·
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APA (6th Edition):
Kassa, T. G. (2016). Pore structure of opal-CT and quartz porcelanites, Monterey Formation, California. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10155529
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kassa, Tesfalidet Ghirmay. “Pore structure of opal-CT and quartz porcelanites, Monterey Formation, California.” 2016. Thesis, California State University, Long Beach. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=10155529.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kassa, Tesfalidet Ghirmay. “Pore structure of opal-CT and quartz porcelanites, Monterey Formation, California.” 2016. Web. 05 Dec 2019.
Vancouver:
Kassa TG. Pore structure of opal-CT and quartz porcelanites, Monterey Formation, California. [Internet] [Thesis]. California State University, Long Beach; 2016. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10155529.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kassa TG. Pore structure of opal-CT and quartz porcelanites, Monterey Formation, California. [Thesis]. California State University, Long Beach; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10155529
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Gallaway, Eric.
Magnetic mineral transport and sorting in the swash-zone:
Northern Lake Erie.
Degree: MA, Geology, 2012, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/152
► A study was conducted along the coast of Point Pelee National Park in northern Lake Erie to address uncertainties over the sediment transport of fine…
(more)
▼ A study was conducted along the coast of
Point Pelee National Park in northern Lake Erie to address
uncertainties over the sediment transport of fine magnetic minerals
(< 250 micrometres) in the swash zone. Magnetic tracers
(magnetite) were tracked with a magnetic susceptibility meter, and
for comparative purposes, fluorescent tracers were also used to
track the movement of two sizes (< 250 micrometres and > 250
micrometres) of non-magnetic grains (quartz and calcite). Despite
higher threshold shear stresses and settling velocities than for
the coarse non-magnetic tracers, movement of the magnetic tracers
was much slower and less prolonged, with the magnetic tracers
eventually being buried and deposited into the upper foreshore. The
results suggest, under low to moderate wave energy conditions,
magnetic grains remain below the surface in the swash zone and do
not contribute to the net sediment transport, and only move during
high energy wave conditions.
Advisors/Committee Members: Cioppa, Maria (Earth Sciences).
Subjects/Keywords: Geology.
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APA (6th Edition):
Gallaway, E. (2012). Magnetic mineral transport and sorting in the swash-zone:
Northern Lake Erie. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/152
Chicago Manual of Style (16th Edition):
Gallaway, Eric. “Magnetic mineral transport and sorting in the swash-zone:
Northern Lake Erie.” 2012. Masters Thesis, National Library of Canada. Accessed December 05, 2019.
http://scholar.uwindsor.ca/etd/152.
MLA Handbook (7th Edition):
Gallaway, Eric. “Magnetic mineral transport and sorting in the swash-zone:
Northern Lake Erie.” 2012. Web. 05 Dec 2019.
Vancouver:
Gallaway E. Magnetic mineral transport and sorting in the swash-zone:
Northern Lake Erie. [Internet] [Masters thesis]. National Library of Canada; 2012. [cited 2019 Dec 05].
Available from: http://scholar.uwindsor.ca/etd/152.
Council of Science Editors:
Gallaway E. Magnetic mineral transport and sorting in the swash-zone:
Northern Lake Erie. [Masters Thesis]. National Library of Canada; 2012. Available from: http://scholar.uwindsor.ca/etd/152
17.
Cui, Tao.
Formation mechanisms of unconformity-related uranium
deposits: insights from numerical modeling.
Degree: PhD, Geology, 2012, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/443
► A series of numerical experiments based on the finite element and finite difference modelings have been carried out to investigate ore-forming fluid systems related to…
(more)
▼ A series of numerical experiments based on
the finite element and finite difference modelings have been
carried out to investigate ore-forming fluid systems related to
uranium mineralization. Conceptual models were constructed by
integrating important hydrogeological features shared by the
Athabasca, Thelon and Kombolgie basins. Based on these conceptual
models, various numerical scenarios were designed to investigate
the interaction among fluid flow, heat transport, topographic
relief and tectonic deformation. Equations governing these
processes were solved by FEFLOW and FLAC. The modeling suggests
that buoyancy-driven thermohaline convection develops in thick
sandstone sequences at any geothermal gradient of 25to35 C/km
during periods of tectonic quiescence. Thermohaline convection may
penetrate into the basement for up to1-2 km below the basal
unconformity when typical hydrological parameters for these
Proterozoic hydrogeological units are used. Fluid flow velocities
in the sandstone sequence are several orders of magnitude larger
than those in the basement. If a uranium source is assumed to be
located in the center of the basin below the unconformity, uranium
is able to gradually spread into the sandstone through thermohaline
convection. The location of the uranium source also affects the
solute transport efficiency. Given appropriate hydrological
conditions, thermohaline convection could have caused widespread
interaction of basinal brines with basement rocks or
basement-derived fluids in uranium-bearing Proterozoic basins, and
that enough uranium could have been leached from the uranium-rich
basement to form large, high-grade unconformity-related uranium
deposits. Reactivation of preexisting basement structures and the
generation of new faults suppress free convection and lead to
deformation-dominated fluid flow or mixed convection, depending on
strain rates. During compressive deformation, reduced brines in the
basement may be forced out along fractured zones and encounter
uranium-bearing fluids in the clastic sequence to form
sandstone-hosted deposits. By contrast, basement-hosted deposits
are likely to form during extension, when oxidized basinal brines
flow into faulted structures to interact with reduced minerals or
fluids in the basement. Thus, the combined effect of thermohaline
convection and tectonic deformation leads to the development of
unconformity-related uranium deposits at intersections of the basal
unconformity with faults or shear zones.
Advisors/Committee Members: Yang, Jianwen (Geology).
Subjects/Keywords: Geology.
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APA (6th Edition):
Cui, T. (2012). Formation mechanisms of unconformity-related uranium
deposits: insights from numerical modeling. (Doctoral Dissertation). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/443
Chicago Manual of Style (16th Edition):
Cui, Tao. “Formation mechanisms of unconformity-related uranium
deposits: insights from numerical modeling.” 2012. Doctoral Dissertation, National Library of Canada. Accessed December 05, 2019.
http://scholar.uwindsor.ca/etd/443.
MLA Handbook (7th Edition):
Cui, Tao. “Formation mechanisms of unconformity-related uranium
deposits: insights from numerical modeling.” 2012. Web. 05 Dec 2019.
Vancouver:
Cui T. Formation mechanisms of unconformity-related uranium
deposits: insights from numerical modeling. [Internet] [Doctoral dissertation]. National Library of Canada; 2012. [cited 2019 Dec 05].
Available from: http://scholar.uwindsor.ca/etd/443.
Council of Science Editors:
Cui T. Formation mechanisms of unconformity-related uranium
deposits: insights from numerical modeling. [Doctoral Dissertation]. National Library of Canada; 2012. Available from: http://scholar.uwindsor.ca/etd/443
University of Kansas
18.
Serradji, Hayet.
Depositional environments and sequence stratigraphy of the lower Cretaceous Dakota Sandstone in the Ridgway area, southwestern Colorado.
Degree: 2008, University of Kansas
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1449678
► The Dakota Sandstone records the initial transgression of the Cretaceous western interior seaway across southwestern Colorado. This transgression does not show a simple pattern.…
(more)
▼ The Dakota Sandstone records the initial transgression of the Cretaceous western interior seaway across southwestern Colorado. This transgression does not show a simple pattern. The sequence stratigraphic analysis of the Dakota Sandstone indicates that the initial part of this transgression occurred in multiple steps. This study concentrates on eleven sections in the Ridgway, Colorado area. Facies analysis identified five depositional facies: delta plain, delta front, radial bifurcating channel (distributary-channel), lower shoreface and fluvial channel. Deltaic facies are the predominant facies and show interaction between fluvial and marine processes. Higher wave influence is present in the upper part of the formation, seen by the presence of hummocky cross stratification in a lower shoreface setting. This increase in wave energy suggests a change in shoreline configuration. At the base of the formation, deltaic sediment accumulated in an embayed coastline, protected from wave energy. Near the top of the formation, the shoreline became straighter with higher wave influence. At the top of the formation, the shoreline returned to an embayed configuration. Sequence stratigraphic interpretation of the Dakota Sandstone reveals the presence of eleven parasequences and three depositional sequences, with two incised valleys. Sequences are bounded by erosional surfaces or their correlative interfluve expressions. Sequence one starts in the underlying Burro Canyon Formation, continues into the Dakota Sandstone, and includes seven parasequences represented by delta plain, delta front and distributary channel facies. These parasequences show a retrogradational followed by an aggradational stacking pattern. Sequence two contains three parasequences and includes an incised valley-fill at the base overlain by lower shoreface and delta-front facies. The staking pattern is defined as aggradational within this sequence. The lower part of sequence three occurs within the Dakota Sandstone; the remainder of the sequence occurs in the overlying Mancos Shale. The part of sequence three within the Dakota Sandstone is represented entirely by fluvial deposits within an incised valley. The sequence stratigraphic interpretation of the Dakota Sandstone in southwestern Colorado reveals the complexities related to the initial transgression of the Cretaceous Western Interior Seaway. These complexities are seen via the presence of different sequences, as opposed to a single parasequence set characterized by a retrogradational stacking pattern.
Subjects/Keywords: Geology
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APA (6th Edition):
Serradji, H. (2008). Depositional environments and sequence stratigraphy of the lower Cretaceous Dakota Sandstone in the Ridgway area, southwestern Colorado. (Thesis). University of Kansas. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1449678
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Serradji, Hayet. “Depositional environments and sequence stratigraphy of the lower Cretaceous Dakota Sandstone in the Ridgway area, southwestern Colorado.” 2008. Thesis, University of Kansas. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1449678.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Serradji, Hayet. “Depositional environments and sequence stratigraphy of the lower Cretaceous Dakota Sandstone in the Ridgway area, southwestern Colorado.” 2008. Web. 05 Dec 2019.
Vancouver:
Serradji H. Depositional environments and sequence stratigraphy of the lower Cretaceous Dakota Sandstone in the Ridgway area, southwestern Colorado. [Internet] [Thesis]. University of Kansas; 2008. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1449678.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Serradji H. Depositional environments and sequence stratigraphy of the lower Cretaceous Dakota Sandstone in the Ridgway area, southwestern Colorado. [Thesis]. University of Kansas; 2008. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1449678
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
San Jose State University
19.
Michels, Zachary David.
Structure of the Central Skagit Gneiss Complex, North Cascades, Washington.
Degree: 2009, San Jose State University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1463389
► The tonalitic orthogneiss-dominated Central Skagit Gneiss Complex of the Cretaceous to Eocene North Cascades crystalline core consists of four units, differentiated on field and…
(more)
▼ The tonalitic orthogneiss-dominated Central Skagit Gneiss Complex of the Cretaceous to Eocene North Cascades crystalline core consists of four units, differentiated on field and petrographic observations. New U/Pb zircon analyses yield crystallization ages for the orthogneisses between ∼66 and 48 Ma. Microstructures indicate medium- to high-temperature (400-650°C) deformation. Much deformation in the adjacent dextral Gabriel Peak tectonic belt, a segment of the 500-km-long Ross Lake fault system, predates crystallization of ca. 49.3 Ma orthogneisses. Lineations in the Eocene gneisses dominantly record subhorizontal NNE stretching discordant to the NW regional trend of the Cascades core and the tectonic belt. This discordance may reflect a change in the Eocene strain field, which is best recorded in rocks that were hot and ductile at the time. Thus, structures in the Central Skagit Gneiss Complex probably record some of the latest ductile deformation in the core.
Subjects/Keywords: Geology
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APA (6th Edition):
Michels, Z. D. (2009). Structure of the Central Skagit Gneiss Complex, North Cascades, Washington. (Thesis). San Jose State University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1463389
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Michels, Zachary David. “Structure of the Central Skagit Gneiss Complex, North Cascades, Washington.” 2009. Thesis, San Jose State University. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1463389.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Michels, Zachary David. “Structure of the Central Skagit Gneiss Complex, North Cascades, Washington.” 2009. Web. 05 Dec 2019.
Vancouver:
Michels ZD. Structure of the Central Skagit Gneiss Complex, North Cascades, Washington. [Internet] [Thesis]. San Jose State University; 2009. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1463389.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Michels ZD. Structure of the Central Skagit Gneiss Complex, North Cascades, Washington. [Thesis]. San Jose State University; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1463389
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Nimlos, Erik.
Spatial variations of rockfalls from a growing lava dome| Soufriere Hills Volcano, Montserrat.
Degree: 2009, State University of New York at Buffalo
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1464811
► The lava dome at Soufriere Hills Volcano poses a physical hazard to nearby inhabitants. When the lava dome collapses, pyroclastic flows are generated that…
(more)
▼ The lava dome at Soufriere Hills Volcano poses a physical hazard to nearby inhabitants. When the lava dome collapses, pyroclastic flows are generated that can travel several kilometers from their source. Understanding the behavior of lava domes is often performed using rockfalls produced by gravitational instabilities on the lava dome. Rockfalls generate seismic signals from which seismic energy can be extracted. Previous work has demonstrated that rockfalls may be locatable based upon their seismic energy, and this work develops a continuation of that approach. Rockfall direction and intensity is most likely determinable by seismic energy distribution as measured by the seismic station network, thus not requiring direct visual analysis, as clouds often cover the lava dome at Soufriere Hills Volcano. In this work, a technique was developed, which allows seismic data to be used to both identify and locate small rockfalls, a predecessor to most lava dome collapses. Digital photographs of the lava dome from remote cameras and rockfall seismic energy data from 11 February 2006 - 1 May 2007 were utilized to visually confirm rockfall seismic event locations. From a set of 25, 297 seismic events, 1180 of these were visually confirmed and assigned a controlled location based in one of four quadrants surrounding the lava dome (i.e. quadrant one represented north, quadrant two represented east, etc.). From this dataset, a seismic energy-based mapping system was implemented; contours of equal energy were calculated using a cubic spline interpolation based on the total energy recorded for each seismic event. The energy mapping displayed each rockfall location in one of four quadrants, displaying results from both the cubic spline interpolation and the control dataset. Two different energy maps were created to compare the initial and final directions of rockfall runout. Results of the seismic energy-based mapping yielded event initial rockfall location accuracies of 58%, 48%, 9% and 13% for quadrants one through four respectively. Final rockfall location accuracies were 61%, 41%, 10%, and 14% for quadrants one through four respectively. Ratios of seismic energy between seismic stations often produced two distinct trend lines of strong data scattering for seismic events located in quadrant one; both phenomenon were believed to be caused by path effects on seismic energy. Visually, the energy mapping was able to accurately indicate the direction of dome collapse prior to collapse events on 20 May 2006, 30 June 2006 and 8 January 2007. Actual rockfall runout direction was found to be controlled by current lava dome dimension. Rockfall frequencies prior to collapse were variable and not necessarily indicative of collapse immanency. Sources of inaccuracy were identified to be path effects on seismic energy distribution, and the availability and quality of seismic data. With improved accuracy, the method of seismic energy-based mapping of rockfalls could be a useful tool in real-time hazard mitigation, having…
Subjects/Keywords: Geology
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APA ·
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Export
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APA (6th Edition):
Nimlos, E. (2009). Spatial variations of rockfalls from a growing lava dome| Soufriere Hills Volcano, Montserrat. (Thesis). State University of New York at Buffalo. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1464811
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nimlos, Erik. “Spatial variations of rockfalls from a growing lava dome| Soufriere Hills Volcano, Montserrat.” 2009. Thesis, State University of New York at Buffalo. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1464811.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nimlos, Erik. “Spatial variations of rockfalls from a growing lava dome| Soufriere Hills Volcano, Montserrat.” 2009. Web. 05 Dec 2019.
Vancouver:
Nimlos E. Spatial variations of rockfalls from a growing lava dome| Soufriere Hills Volcano, Montserrat. [Internet] [Thesis]. State University of New York at Buffalo; 2009. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1464811.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nimlos E. Spatial variations of rockfalls from a growing lava dome| Soufriere Hills Volcano, Montserrat. [Thesis]. State University of New York at Buffalo; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1464811
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
21.
O'Connell, Kristin.
Sedimentology, structural geology, and paleomagnetism of the Ghost Rocks Formation; Kodiak Islands, Alaska.
Degree: 2009, University of California, Davis
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1468156
► Twenty-two hundred kilometers of Alaskan coastline, from Sanak to Baranof Islands, contains evidence of a Cretaceous to Eocene trench-ridge-trench (TRT) triple junction. Due to…
(more)
▼ Twenty-two hundred kilometers of Alaskan coastline, from Sanak to Baranof Islands, contains evidence of a Cretaceous to Eocene trench-ridge-trench (TRT) triple junction. Due to the long-term presence of inboard right-lateral strike-slip faults, the original location of the TRT triple junction with respect to North America is unknown. Previous paleomagnetic studies of the Ghost Rocks Formation of the Kodiak Islands, AK indicate a Latest Cretaceous to Early Paleocene TRT triple junction location of ∼42 degrees north latitude (Plumley et al., 1983). However, this data set has proved controversial in the literature due to discordant site mean directions between the two major bays studied (Alitak and Kiliuda) as well as a 2-stage structural correction in Alitak Bay and possible remagnitization (e.g. Haeussler et al., (2003a). This study presents new sedimentologic, structural geologic, and preliminary paleomagnetic data in an attempt to resolve the location of TRT the triple junction. The Ghost Rocks Formation is part of an accretionary complex which contains turbidites interlayered with pillow lavas and intruded by gabbro and mafic sills. New structural geologic mapping of the Ghost Rocks Formation shows a mean bedding strike of ∼250 degrees, and small-scale block rotations in Alitak Bay. Oriented samples across the formation were taken to include a baked contact test, conglomerate test, and fold test to ensure reliable data. 14 sites from Alitak Bay have been fully analyzed, and 12 sites have been partially analyzed. Second-removed magnetic components represent primary magnetization, and 13 sites showed reliable demagnetization behavior and bedding measurements. In-situ site mean direction for these 13 sites (D=349, I=-45, n=13, k=4.3, α95=22.8) is improved when corrected for local stratigraphy and structural block rotations (D=178, I=-63, n=13, k=29.2, α95=7.8). These results are in partial agreement with the original data, and show an improved agreement between the original Kiliuda Bay and the new Alitak Bay declination directions. Continued study of remaining sites will further constrain the data.
Subjects/Keywords: Geology
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Manager
APA (6th Edition):
O'Connell, K. (2009). Sedimentology, structural geology, and paleomagnetism of the Ghost Rocks Formation; Kodiak Islands, Alaska. (Thesis). University of California, Davis. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1468156
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
O'Connell, Kristin. “Sedimentology, structural geology, and paleomagnetism of the Ghost Rocks Formation; Kodiak Islands, Alaska.” 2009. Thesis, University of California, Davis. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1468156.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
O'Connell, Kristin. “Sedimentology, structural geology, and paleomagnetism of the Ghost Rocks Formation; Kodiak Islands, Alaska.” 2009. Web. 05 Dec 2019.
Vancouver:
O'Connell K. Sedimentology, structural geology, and paleomagnetism of the Ghost Rocks Formation; Kodiak Islands, Alaska. [Internet] [Thesis]. University of California, Davis; 2009. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1468156.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
O'Connell K. Sedimentology, structural geology, and paleomagnetism of the Ghost Rocks Formation; Kodiak Islands, Alaska. [Thesis]. University of California, Davis; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1468156
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
Escobedo, Diane K.
Extreme erosional events recorded by flood deposits in the late quaternary Santa Barbara Basin, coastal southern California.
Degree: 2009, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1472272
► Terrestrial runoff from major storm and flood events in southern California is captured in Santa Barbara Basin (SBB) as distinct gray layers of well-sorted…
(more)
▼ Terrestrial runoff from major storm and flood events in southern California is captured in Santa Barbara Basin (SBB) as distinct gray layers of well-sorted clay to silt that punctuate typical olive-hued hemipelagic mud. Thirty-two partially overlapping piston cores recovered from a breached anticline provide ultra-high resolution windows into a 700,000-year climate record. Frequency, mass accumulation/event, grain size and mineralogy of pre-Holocene gray layer deposits remain remarkably consistent without apparent chronological or climatically related trends. The Holocene record, even in comparison with previous interglacials, contains twice the total mass of gray layer flood deposits, with 60% larger than a destructive 1969 flood event. These deposits reflect increased storm intensity and frequency, more efficient sediment transport, and/or increased terrestrial erosion during the Holocene. Weak correlations with lower-resolution temperature and precipitation records indicate that gray layer flood deposits must have a different forcing mechanism than mean global and regional climate change.
Subjects/Keywords: Geology
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APA (6th Edition):
Escobedo, D. K. (2009). Extreme erosional events recorded by flood deposits in the late quaternary Santa Barbara Basin, coastal southern California. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1472272
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Escobedo, Diane K. “Extreme erosional events recorded by flood deposits in the late quaternary Santa Barbara Basin, coastal southern California.” 2009. Thesis, California State University, Long Beach. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1472272.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Escobedo, Diane K. “Extreme erosional events recorded by flood deposits in the late quaternary Santa Barbara Basin, coastal southern California.” 2009. Web. 05 Dec 2019.
Vancouver:
Escobedo DK. Extreme erosional events recorded by flood deposits in the late quaternary Santa Barbara Basin, coastal southern California. [Internet] [Thesis]. California State University, Long Beach; 2009. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1472272.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Escobedo DK. Extreme erosional events recorded by flood deposits in the late quaternary Santa Barbara Basin, coastal southern California. [Thesis]. California State University, Long Beach; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1472272
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
Fuhrmann, Andrew Richard.
The Origin of the Lower Pliocene Deepwater Andromeda Mound Complex, Levant Basin, Eastern Mediterranean Sea, Offshore Israel.
Degree: 2011, University of Colorado at Boulder
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1487875
► The lower Pliocene Andromeda Mound Complex, located in the eastern Mediterranean Levant Basin, comprises an unusual series of mounded, deepwater sand deposits that developed…
(more)
▼ The lower Pliocene Andromeda Mound Complex, located in the eastern Mediterranean Levant Basin, comprises an unusual series of mounded, deepwater sand deposits that developed on the sea floor due to syndepositional structural growth. Analysis is based on 98 2D seismic lines, a 2886 km2 3D seismic volume, and 1 well log suite penetrating the Andromeda Mound Complex. The Andromeda Mound Complex is composed of fifteen individual or small groups of mounds (A-O) that are confined to the Yafo Sand Member. The fifteen large, mounds are separated into three distinct groups, based on both their internal and external seismic facies. Group 1 mounds (A-H) are structurally the simplest and most easily interpreted. Thickening of the Yafo Sand Member is typically the result of a single thrust fault or box fold. The mounds of Group 2 (I and J) are larger and more structurally complex than those in Group 1. They are more extensively faulted and also contain growth-related sediments. Group 3 mounds (K-O) are the most difficult to interpret. The internal reflections of those mounds have low continuity and extremely low to high amplitude, in part due to extensive deformation. No definitive internal structural or stratigraphic interpretation was possible for the Group 3 mounds. Several important factors contributed to the formation of the unique Andromeda Mound Complex. These factors include: (a) formation of pre-Messinian pockmarks on the sea-floor; (b) initial deposition of Messinian Evaporites that originally extended farther updip than present-day distribution; (c) deposition of the turbidite sands of the Yafo Sand Member on a low gradient slope overlying the top Messinian Evaporites; (d) uplift during the early Pliocene of the underlying Syrian Arc folds, which created conduits for the vertical migration of undersaturated, low-salinity fluids into the Messinian Evaporites; (e) variable amounts of Messinian Evaporite dissolution within the study area; (f) mass-movement of individual blocks of the Yafo Sand Member along the basal detachment surface into collapse features associated with Messinian Evaporite dissolution; and (g) Messinian Evaporite dissolution resulting in the creation of the mounded portions of the Yafo Sand Member and overlying sediments.
Subjects/Keywords: Geology
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APA (6th Edition):
Fuhrmann, A. R. (2011). The Origin of the Lower Pliocene Deepwater Andromeda Mound Complex, Levant Basin, Eastern Mediterranean Sea, Offshore Israel. (Thesis). University of Colorado at Boulder. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1487875
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fuhrmann, Andrew Richard. “The Origin of the Lower Pliocene Deepwater Andromeda Mound Complex, Levant Basin, Eastern Mediterranean Sea, Offshore Israel.” 2011. Thesis, University of Colorado at Boulder. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1487875.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fuhrmann, Andrew Richard. “The Origin of the Lower Pliocene Deepwater Andromeda Mound Complex, Levant Basin, Eastern Mediterranean Sea, Offshore Israel.” 2011. Web. 05 Dec 2019.
Vancouver:
Fuhrmann AR. The Origin of the Lower Pliocene Deepwater Andromeda Mound Complex, Levant Basin, Eastern Mediterranean Sea, Offshore Israel. [Internet] [Thesis]. University of Colorado at Boulder; 2011. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1487875.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fuhrmann AR. The Origin of the Lower Pliocene Deepwater Andromeda Mound Complex, Levant Basin, Eastern Mediterranean Sea, Offshore Israel. [Thesis]. University of Colorado at Boulder; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1487875
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
The University of North Carolina at Chapel Hill
24.
Moore, Jessica Erin.
Relationships of Pliocene magmatism in the northern Sierra Nevada Range to lithospheric delamination and the ancestral Cascade Range.
Degree: 2011, The University of North Carolina at Chapel Hill
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1500732
► Delamination has been invoked to explain Pliocene (3.5 Ma) magmatic activity in the central and southern Sierra Nevada Range (SNR). However, the extent and…
(more)
▼ Delamination has been invoked to explain Pliocene (3.5 Ma) magmatic activity in the central and southern Sierra Nevada Range (SNR). However, the extent and timing of proposed delamination is unknown. By examining volcanic rocks of a similar age in the northern SNR the extent of delamination can be further characterized. Alternatively, Pliocene magmatism in the northern SNR could be a result of subduction, making the area part of an ancestral Cascade Range. The Mendocino Triple Junction was located just south of Lake Tahoe at the time of eruption of Pliocene magmatism in the northern part of the range. Although the geochemical and isotopic compositions of the samples from the northern SNR are closely related to Cascade magmatism the differences include: higher K2O and lower MgO and CaO at a given value of SiO 2, a restricted range of SiO2, and two distinct magmatic events at 4 and 11 Ma.
Subjects/Keywords: Geology
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APA (6th Edition):
Moore, J. E. (2011). Relationships of Pliocene magmatism in the northern Sierra Nevada Range to lithospheric delamination and the ancestral Cascade Range. (Thesis). The University of North Carolina at Chapel Hill. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1500732
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Moore, Jessica Erin. “Relationships of Pliocene magmatism in the northern Sierra Nevada Range to lithospheric delamination and the ancestral Cascade Range.” 2011. Thesis, The University of North Carolina at Chapel Hill. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1500732.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moore, Jessica Erin. “Relationships of Pliocene magmatism in the northern Sierra Nevada Range to lithospheric delamination and the ancestral Cascade Range.” 2011. Web. 05 Dec 2019.
Vancouver:
Moore JE. Relationships of Pliocene magmatism in the northern Sierra Nevada Range to lithospheric delamination and the ancestral Cascade Range. [Internet] [Thesis]. The University of North Carolina at Chapel Hill; 2011. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1500732.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moore JE. Relationships of Pliocene magmatism in the northern Sierra Nevada Range to lithospheric delamination and the ancestral Cascade Range. [Thesis]. The University of North Carolina at Chapel Hill; 2011. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1500732
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Anderson, Zachary Wright.
Structural and basin evolution of the eastern Gale Hills, Lake Mead Miocene extensional domain, Nevada.
Degree: 2012, Northern Arizona University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1517279
► This study focuses on the structures and Miocene sedimentary rocks of the Horse Spring Formation within the western-central Lake Mead domain in southern Nevada.…
(more)
▼ This study focuses on the structures and Miocene sedimentary rocks of the Horse Spring Formation within the western-central Lake Mead domain in southern Nevada. The goals of this study are to better understand the ages, local facies distributions, and relation of the detailed stratigraphy to the structural setting of the Thumb, Bitter Ridge Limestone, and Lovell Wash Members of the Horse Spring Formation in the eastern Gale Hills. Other goals of this study are to better understand the timing and style of folding, faulting, and vertical axis rotations near the intersection and terminus of two regional strike-slip fault systems with opposing sense of slip, the right-lateral Las Vegas Valley shear zone and the left-lateral Lake Mead fault system. To achieve these goals, I created a detailed geologic map (1:5,000 scale) of the eastern Gale Hills, collected samples that were analyzed for tephrachronology and geochronology, collected samples for paleomagnetic analysis, and collected kinematic and other structural data from primary and secondary structures. Two new paleomagenetic results are presented and discussed here along with the analysis of previous paleomagnetic results. Tephrachronology of ash-fall tuffs provides new age control throughout the Thumb Member within the eastern Gale Hills. Map and facies relationships provide new insights into the time-transgressive nature of the base of the Bitter Ridge Limestone Member as well as basin margin facies of the Bitter Ridge Limestone Member. Map and facies relationships also provide new insights on the nomenclature and stratigraphic position of the top of the Bitter Ridge Limestone Member and the base of the Lovell Wash Member. Active normal faulting was present in the study area during deposition of the lower Thumb Member beginning ca. 16.0 Ma. Normal faulting continued throughout deposition of the Thumb Member. It is proposed here that the Las Vegas Valley shear zone propagated into the Gale Hills area ca. 15.0 Ma. The Bitter Ridge Limestone in the study area was deposited in an algal lake, which was located north of a north-down normal fault that shed coarse-grained sediments, derived from the uplifted footwall, into the algal lake. The relationships between the sedimentary rocks and the faults and folds suggest that the majority of the deformation in the eastern Gale Hills took place during and after the deposition of the Lovell Wash Member from 13.7 to ∼12 Ma. Deformation in the northern part of the study area is dominated by north-northeast-striking normal and left-oblique-slip faults that accommodated ∼10° - 20° amounts of clockwise rotations. The southern part of the study area is dominated by east-west-trending contractional structures: plunging folds accommodated vertical axis rotations. Strain in the Highway block accommodated the deformation pattern at the interaction of the left-lateral western Bitter Spring Valley fault and the right-lateral Las Vegas Valley shear zone. Basin inversion of the eastern Gale Hills took…
Subjects/Keywords: Geology
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APA (6th Edition):
Anderson, Z. W. (2012). Structural and basin evolution of the eastern Gale Hills, Lake Mead Miocene extensional domain, Nevada. (Thesis). Northern Arizona University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1517279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Anderson, Zachary Wright. “Structural and basin evolution of the eastern Gale Hills, Lake Mead Miocene extensional domain, Nevada.” 2012. Thesis, Northern Arizona University. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1517279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Anderson, Zachary Wright. “Structural and basin evolution of the eastern Gale Hills, Lake Mead Miocene extensional domain, Nevada.” 2012. Web. 05 Dec 2019.
Vancouver:
Anderson ZW. Structural and basin evolution of the eastern Gale Hills, Lake Mead Miocene extensional domain, Nevada. [Internet] [Thesis]. Northern Arizona University; 2012. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1517279.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Anderson ZW. Structural and basin evolution of the eastern Gale Hills, Lake Mead Miocene extensional domain, Nevada. [Thesis]. Northern Arizona University; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1517279
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Missouri – Columbia
26.
Chen, Yanying.
Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota.
Degree: 2013, University of Missouri – Columbia
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1521676
► Garnets in Proterozoic metapelites in the Black Hills, South Dakota, were analyzed to determine their pressure, temperature and hydrothermal conditions of growth and to…
(more)
▼ Garnets in Proterozoic metapelites in the Black Hills, South Dakota, were analyzed to determine their pressure, temperature and hydrothermal conditions of growth and to elucidate pressure-temperature-time (P-T-t) paths of their host rocks. The metapelites are the product of garnet-grade regional metamorphism beginning at ∼1755 Ma due to the collision of Wyoming and Superior cratons and subsequent contact metamorphism by intrusion of the Harney Peak Granite (HPG) at ∼1715 Ma. Garnet occurs in the garnet zone, and contact-metamorphic staurolite and sillimanite zones. X-ray element maps and compositional profiles across garnets were determined using electron-probe microanalysis (EPMA). Mineral assemblage diagrams (pseudosections) with garnet composition contours were constructed using the THERIAK-DOMINO software. The diagrams provide a foundation for determining the conditions of garnet growth and P-T-t paths for their host rocks. In the garnet zone, garnets have inclusion-rich centers and almost inclusion-free rims. The garnets display low-Ca cores (Xgrs = 0.08-0.1), followed by slightly more elevated Ca annuli (Xgrs ∼ 0.1) and low-Ca rims (Xgrs<0.1). Fe increases from core (Xalm ∼ 0.4-0.5) to rim (Xalm ∼ 0.5-0.7). Mn decreases from core (X sps ∼ 0.38-0.45) to rim (Xsps ∼ 0.3-0.4). Mg slightly increases from Xpy < 0.05 in cores toward rims. Y concentrations are higher in cores and some garnets display high-Y annuli near or at rims. From cores toward rims, indicated pressure increases nearly isothermally and gradually from ∼2.4 to ∼4.5 kbar. The very rims show slightly more elevated temperatures by ∼30°C. The rims potentially indicate a late heating pulse due to regional leucogranite magmatism. In the staurolite zone, garnets contain fewer inclusions. Zoned garnets have relatively high-Ca cores (Xgrs ∼ 0.1) and low-Ca rims (Xgrs ∼ 0.03). Fe increases from cores (Xalm ∼ 0.5) to rims (Xalm ∼ 0.82), Mn decreases from cores (X sps ∼ 0.21-0.35) to rims (Xsps ∼ 0.08) and Mg increases from cores (Xpy ∼ 0.04) to rims (Xpy ∼ 0.1). Y displays high concentrations in cores and some garnets also have high-Y annuli. Indicated pressures during growth of cores are 3 to 3.5 kbar whereas rims indicate pressures of 4 kbar. From cores to rims, temperature increased from ∼500°C to more than 600°C. In the sillimanite zone, garnet zoning is minimal. Xgrs is <0.05 and Xalm ∼ 0.77. Mn is uniform (Xsps ∼ 0.1) except for slightly elevated concentrations in rims. Xpy is <0.1, except in rims where it is lower. Y concentrations are high in the cores. From core to rim, indicated pressure decreases from >5 kbar to ∼4.2 kbar. The geochemical characteristics of the garnets and the…
Subjects/Keywords: Geology
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APA ·
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APA (6th Edition):
Chen, Y. (2013). Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota. (Thesis). University of Missouri – Columbia. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1521676
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Yanying. “Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota.” 2013. Thesis, University of Missouri – Columbia. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1521676.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Yanying. “Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota.” 2013. Web. 05 Dec 2019.
Vancouver:
Chen Y. Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota. [Internet] [Thesis]. University of Missouri – Columbia; 2013. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1521676.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen Y. Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota. [Thesis]. University of Missouri – Columbia; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1521676
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
27.
Smolen, Mickael.
Pit crater formation| Laboratory simulations and applications to Mars.
Degree: 2013, State University of New York at Buffalo
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1534543
► Pits craters are circular to ovoid collapse features observed on Earth and most solid bodies in the Solar System. To better understand the origins…
(more)
▼ Pits craters are circular to ovoid collapse features observed on Earth and most solid bodies in the Solar System. To better understand the origins and evolution of pit craters and chains, laboratory simulations (using layered sand and sand mixed with flour deposited on two horizontal wooden that can be incrementally separated) were conducted. As the opening between plates increased, isolated, sub-circular pit craters evolved into elongated, coalesced craters or troughs, with adjacent parallel fractures (trending perpendicular to the direction of extension) becoming more evident and the width of the pits remaining unchanged. A relationship was found between the spacing between the adjacent parallel fractures and the total thickness of material: the ratio between these parameters ranges from 1.13 to 1.88 in the laboratory simulations. Laboratory pit-crater chains were compared to measurements of Martian pit craters observed in high-resolution (<1 m/pixel) images; qualitative and quantitative comparisons suggest that the measured Martian pit craters also formed via collapse over a zone of extension. Applying laboratory simulation results to measurements of Martian pit craters allowed estimation of affected material thicknesses on Mars between <1 km (near Arsia Mons) and >20 km (near Alba Mons). Such variation in thickness is likely caused by more or less accumulation of lava flows around these major volcanoes. Structural mapping of a portion of Arsia Mons' northeast flank, containing abundant troughs, pit-crater chains and some sinuous rilles, was completed. Within the map area, structural mapping established that pit craters are older than other features such as chaotic terrains, rilles, or sinkholes, and (for the most part) younger than troughs. Both pit chains and troughs generally trend in the same direction (NE to NNE) and could have originated through a common volcanic rifting event (or events) affecting Arsia Mons. Results from the work presented here support the concept that extensional fracturing and dilational faulting are common mechanisms for Martian pit crater formation.
Subjects/Keywords: Geology
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Manager
APA (6th Edition):
Smolen, M. (2013). Pit crater formation| Laboratory simulations and applications to Mars. (Thesis). State University of New York at Buffalo. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1534543
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Smolen, Mickael. “Pit crater formation| Laboratory simulations and applications to Mars.” 2013. Thesis, State University of New York at Buffalo. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=1534543.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smolen, Mickael. “Pit crater formation| Laboratory simulations and applications to Mars.” 2013. Web. 05 Dec 2019.
Vancouver:
Smolen M. Pit crater formation| Laboratory simulations and applications to Mars. [Internet] [Thesis]. State University of New York at Buffalo; 2013. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1534543.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smolen M. Pit crater formation| Laboratory simulations and applications to Mars. [Thesis]. State University of New York at Buffalo; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1534543
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
The University of Oklahoma
28.
Ghosh, Kajari.
Fracture characterization, structural controls and simulation.
Degree: 2009, The University of Oklahoma
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3344949
► Fracture network patterns have been studied in two areas with different structural settings: (a) Dolomitic limestones on Teton anticline, in the frontal part of…
(more)
▼ Fracture network patterns have been studied in two areas with different structural settings: (a) Dolomitic limestones on Teton anticline, in the frontal part of the fold thrust belt in the Sawtooth Range, Montana and (b) Cedar Mesa sandstones within normal faulted structures in the Canyonlands area, Utah. GIS-based techniques were used to study the two-dimensional distribution of fractures on exposed bedding planes in both areas. Individual fracture characteristics, such as fracture length, orientation, and density were analyzed along with the connectivity pattern of fracture networks. The latter parameter is important in determining whether the fractures are isolated or form extensive connected pathways. Studies on both structures reveal that the fracture patterns vary with structural position. In the Teton anticline, which is a multiple hinge anticline, the longitudinal fractures represent the dominant fracture set, and show the most variation with structural position, with values greater at the hinges than on the limbs. Transverse fractures, on the other hand, show less variation with structural position and show higher densities in the vicinity of regional fractures. A method of fracture simulation which incorporates the structural controls on fracture densities was developed and applied to the Teton anticline. In the Canyonlands area, the higher density of fault-parallel fractures is observed within a narrow zone in the vicinity of normal faults. Fracture permeability is strongly controlled by the connectivity of fractures. The connectivity of a fracture network depends on the geometry and characteristics of individual fractures and also on how the fracture sets are distributed in space. Increasing fracture propagation leads to the formation of clusters or connected fractures. The connected clusters increase in size as (1) an increasing number of fractures are added to the system, (2) the lengths of the fractures increase to connect individual fractures, (3) the orientations of fractures in a set exhibit a higher degree of dispersion, or (4) fractures of multiple sets are added to the system. A series of fracture simulations were modeled to investigate the influence of the four characteristics on the fracture network, and to identify the relative contribution of each factor towards network connectivity. Fracture clustering was also studied for both the Teton anticline and the Canyonlands area, and found to be strongly controlled by structural position.
Subjects/Keywords: Geology
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APA (6th Edition):
Ghosh, K. (2009). Fracture characterization, structural controls and simulation. (Thesis). The University of Oklahoma. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3344949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ghosh, Kajari. “Fracture characterization, structural controls and simulation.” 2009. Thesis, The University of Oklahoma. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=3344949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ghosh, Kajari. “Fracture characterization, structural controls and simulation.” 2009. Web. 05 Dec 2019.
Vancouver:
Ghosh K. Fracture characterization, structural controls and simulation. [Internet] [Thesis]. The University of Oklahoma; 2009. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3344949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ghosh K. Fracture characterization, structural controls and simulation. [Thesis]. The University of Oklahoma; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3344949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
The University of Oklahoma
29.
McColgan, Paul.
A regional model to test the concept of global eastward mantle flow using finite elements.
Degree: 2009, The University of Oklahoma
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3355819
► Computer modeling of tectonics involving the entire Caribbean and North Andes plates, as well as most of the Cocos plate and a portion of…
(more)
▼ Computer modeling of tectonics involving the entire Caribbean and North Andes plates, as well as most of the Cocos plate and a portion of the Nazca plate, have been used to support the concept of a global eastward mantle flow beneath the region. The eastward flow is interpreted to be the results of a lithospheric rotation relative to the asthenosphere. The tectonic modeling has been used in combination with observations for the region to support a best fitting model that includes the global eastward flow. The best fitting model to surface observations used parameters consisting of a due east asthenosphere flow at 100 mm/yr, a base of lithosphere temperature of 1380 K, and a fault friction coefficient of 0.12. The results from the best model demonstrate that a simple uniform eastward flow in the asthenosphere can account for the varying directions of movement and velocities on the surface for the tectonic plates in this region. The model was able to reproduce the simultaneous movements for the Caribbean plate, at nearly due east, the North Andes plate to the northeast, the Nazca plate due east, and the Cocos plate to the northeast. In addition, the best model was able to reproduce the large velocity contrasts between the Cocos plate at 70 plus mm/yr relative to the Caribbean plate at 20 mm/yr and the velocity contrast between the Nazca plate at 50 plus mm/yr and the North Andes plate at 10 mm/yr. These results demonstrate that simple uniform flow of the asthenosphere to the east in conjunction with plate to plate interaction can explain the complex movements that we observe for the tectonics of this region, and might serve as an overall global model.
Subjects/Keywords: Geology
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APA (6th Edition):
McColgan, P. (2009). A regional model to test the concept of global eastward mantle flow using finite elements. (Thesis). The University of Oklahoma. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3355819
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
McColgan, Paul. “A regional model to test the concept of global eastward mantle flow using finite elements.” 2009. Thesis, The University of Oklahoma. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=3355819.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McColgan, Paul. “A regional model to test the concept of global eastward mantle flow using finite elements.” 2009. Web. 05 Dec 2019.
Vancouver:
McColgan P. A regional model to test the concept of global eastward mantle flow using finite elements. [Internet] [Thesis]. The University of Oklahoma; 2009. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3355819.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McColgan P. A regional model to test the concept of global eastward mantle flow using finite elements. [Thesis]. The University of Oklahoma; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3355819
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Reno, Barry L.
Timing of orogenesis in the Southern Brasilia Belt.
Degree: 2009, University of Maryland, College Park
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3359414
► The Neoproterozoic–Cambrian Brasília Orogeny records suturing of the passive margin on the western side of the São Francisco Craton with magmatic arcs and the…
(more)
▼ The Neoproterozoic–Cambrian Brasília Orogeny records suturing of the passive margin on the western side of the São Francisco Craton with magmatic arcs and the Paranapanema Block in the south or the Amazon Craton in the north during the assembly of West Gondwana. In the southern sector of the Southern Brasília Belt, the Andrelândia Nappe Complex comprises a stack of passive margin-derived nappes metamorphosed to high-pressure granulite facies during subduction-to-collision orogenesis and overlain by an arc-derived high-pressure granulite facies nappe. I present the results of an integrated petrologic and chronologic study on the metamorphic conditions and the timing and duration of orogenesis in the Andrelândia Nappe Complex. I also report on my implementation of the (U-Th)-Pb monazite EPMA dating technique at the University of Maryland, and propose a protocol for statistical analysis and interpretation of monazite ages. Using the U-Pb zircon chronometer in conjunction with Ti-in-zircon thermometry, REE distribution data and petrologic observations, a minimum age for timing of initial nappe detachment is constrained to 678±29 Ma, whereas just-post-peak-<i> T</i> metamorphism of the uppermost passive margin-derived Três Pontas–Varginha Nappe is interpreted to have occurred at <i>ca. </i> 648 Ma. (U-Th)-Pb monazite ages in the Três Pontas–Varginha and underlying Carmo da Cachoeira Nappes indicate that they were accreted to the hanging wall of the subduction zone at depths corresponding to near-peak-<i> P</i> by 635–624 Ma. High-<i>P</i> granulite facies metamorphism of the arc-derived nappe is dated by a U-Pb zircon age of 622±28 Ma. Two Rb-Sr multimineral–whole rock isochrons record cooling of the Três Pontas–Varginha Nappe below ∼700°C at <i>ca.</i> 590 Ma, suggesting slow cooling from peak-<i>T.</i> 40Ar/ 39Ar biotite ages between 591.4±6.6 and 568.9±6.1 for the Três Pontas–Varginha Nappe indicate an increased cooling rate interpreted to be due to tectonically-driven exhumation. 40Ar/ 39Ar biotite ages of <i>ca.</i> 540 Ma in the Carmo da Cachoeira Nappe indicate that this nappe was exhumed after the Três Pontas–Varginha Nappe had cooled below ∼300°C. In the southeast part of the Nappe Complex, the Andrelândia Nappe yields 40Ar/39 Ar biotite ages consistent with emplacement directly on the São Francisco Craton and cooling from the bottom up.
Subjects/Keywords: Geology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Reno, B. L. (2009). Timing of orogenesis in the Southern Brasilia Belt. (Thesis). University of Maryland, College Park. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3359414
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Reno, Barry L. “Timing of orogenesis in the Southern Brasilia Belt.” 2009. Thesis, University of Maryland, College Park. Accessed December 05, 2019.
http://pqdtopen.proquest.com/#viewpdf?dispub=3359414.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Reno, Barry L. “Timing of orogenesis in the Southern Brasilia Belt.” 2009. Web. 05 Dec 2019.
Vancouver:
Reno BL. Timing of orogenesis in the Southern Brasilia Belt. [Internet] [Thesis]. University of Maryland, College Park; 2009. [cited 2019 Dec 05].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3359414.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Reno BL. Timing of orogenesis in the Southern Brasilia Belt. [Thesis]. University of Maryland, College Park; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3359414
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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