Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for +publisher:"Harvard University" +contributor:("Johnston, David xmlui.authority.confidence.description.cf_uncertain"). One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters

1. Bold, Uyanga. Neoproterozoic to Paleozoic Geology of Southwestern Mongolia.

Degree: PhD, 2016, Harvard University

The Neoproterozoic and Paleozoic evolution of global climate, tectonics, ocean geochemistry, and biological diversification are recorded in stratigraphic successions globally. The rock record of southwestern Mongolia has potential to reveal additional constraints as it is in the early stages of exploration. It has been known for several years that Cryogenian passive margin sedimentation on the Zavkhan Terrane hosts evidence for Neoproterozoic glaciation, and that overlying early Cambrian strata host rich records of small shelly fossils; however, the geological context for these critical records has been previously lacking. Although these unknowns can be regarded as local geologic uncertainties, together they hold implications to test existing tectonic and crustal growth models of the Central Asian Orogenic Belt (CAOB), preservation potential of geochemical proxies within carbonate dominated strata, and biologic milestones as recorded in Paleozoic sediments. To understand and interpret the above implications, methods of field geology, litho- and chemo-stratigraphy, geochemistry, petrography, fluid inclusion and clumped isotope thermometries, and U-Pb zircon geochronology were used. As a result, the tectonic origin and travels of the Zavkhan Terrane during the Neoproterozoic to early Paleozoic is refined and models of apparent crustal growth in the CAOB are re-assessed. Global Cryogenian and Ediacaran carbon and strontium isotope curves are constructed from limestonedominated successions of the Tsagaan-Olom Group of the Zavkhan Terrane and are integrated with available geochronologic and geochemical data from around the globe. Finally, dolomitization is shown to greatly alter primary geochemical signatures, including carbon isotope values of carbonate rocks.

Earth and Planetary Sciences

Advisors/Committee Members: Johnston, David xmlui.authority.confidence.description.cf_uncertain (advisor), Knoll, Andrew (committee member), Schrag, Daniel (committee member).

Subjects/Keywords: Geology

…I also thank the students both at Harvard University and MUST, who have helped me in the… …received the Winkler Fellowship from Harvard University since 2014. I would like to thank the… …Winkler Fund Committee at Financial Services at Harvard University for relieving me from a big… …to thank Dr. Raquel AlonsoPerez, curator at Mineralogical & Geological Museum of Harvard… …University, for her constant support and valuable discussions on fundamental geologic concepts. I… 

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bold, U. (2016). Neoproterozoic to Paleozoic Geology of Southwestern Mongolia. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493509

Chicago Manual of Style (16th Edition):

Bold, Uyanga. “Neoproterozoic to Paleozoic Geology of Southwestern Mongolia.” 2016. Doctoral Dissertation, Harvard University. Accessed January 29, 2020. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493509.

MLA Handbook (7th Edition):

Bold, Uyanga. “Neoproterozoic to Paleozoic Geology of Southwestern Mongolia.” 2016. Web. 29 Jan 2020.

Vancouver:

Bold U. Neoproterozoic to Paleozoic Geology of Southwestern Mongolia. [Internet] [Doctoral dissertation]. Harvard University; 2016. [cited 2020 Jan 29]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493509.

Council of Science Editors:

Bold U. Neoproterozoic to Paleozoic Geology of Southwestern Mongolia. [Doctoral Dissertation]. Harvard University; 2016. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493509

.