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You searched for +publisher:"University of Otago" +contributor:("Gorman, Andrew R"). Showing records 1 – 2 of 2 total matches.

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University of Otago

1. Abbey, Cameron James. The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data .

Degree: University of Otago

Submarine canyons are well documented, both around New Zealand and globally, but questions remain around the processes involved in their formation and evolution as well as around how their morphology reflects their developmental history. The Waitaki Canyon, located at the edge of the passive Otago Shelf in the Canterbury Basin, southeast New Zealand, presents an opportunity to investigate the near-surface features associated with a shelf-indenting submarine canyon using high-resolution seismic data. One such high-resolution survey was conducted in early 2015, collecting approximately 270 km of boomer seismic data in a high-density survey pattern centred at the head of the Waitaki Canyon. Approximately 40 km2 of the seafloor bathymetric data was also collected during that cruise. These data were analysed, along with approximately 100 km of boomer seismic data from a previous survey in the area and a selection of lower resolution seismic data from surveys conducted by the hydrocarbon industry, to investigate the subsurface structures in the vicinity of the Waitaki Canyon for evidence of changes in the canyon’s morphology throughout the Quaternary Period. South of the Waitaki Canyon, a large (several kilometres across) asymmetrical system of infilled paleochannels is intersected by a canyon-parallel survey line and canyon-perpendicular lines. Several high-order sequence boundaries are identifed throughout the survey area, and a region of seafloor depressions is observed on a ridge near the head of the canyon. Seismic reflections from the outer parts of the across-shelf survey lines are generally conformable, and do not show evidence of significant lateral migration of the canyon’s point of incision. The preferred interpretation of the stratigraphy and structures imaged in the data is that they represent the poorly preserved upper reaches of a series of paleochannels that had their heads somewhere west of the present canyon head and curved, or kinked, in very shallow S-shapes to rejoin the present path of the canyon. The canyon-parallel survey line thus intersects this kink and then approximately follows the centreline of the infilled channel, resulting in an asymmetric subsurface feature. The more recent symmetrical features are interpreted as non-axial tributaries or vestigial remains of this larger paleochannel. This research has uncovered previously unknown features related to the Waitaki Canyon; however, more work is necessary to fully understand the relationship of those features to the present-day form of the canyon and the processes that were involved in their development. Advisors/Committee Members: Gorman, Andrew R (advisor).

Subjects/Keywords: geophysics; waitaki; submarine canyon; canterbury basin; otago shelf; canyon; quaternary

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APA (6th Edition):

Abbey, C. J. (n.d.). The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data . (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/7400

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Chicago Manual of Style (16th Edition):

Abbey, Cameron James. “The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data .” Masters Thesis, University of Otago. Accessed October 15, 2019. http://hdl.handle.net/10523/7400.

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MLA Handbook (7th Edition):

Abbey, Cameron James. “The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data .” Web. 15 Oct 2019.

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No year of publication.

Vancouver:

Abbey CJ. The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data . [Internet] [Masters thesis]. University of Otago; [cited 2019 Oct 15]. Available from: http://hdl.handle.net/10523/7400.

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Council of Science Editors:

Abbey CJ. The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data . [Masters Thesis]. University of Otago; Available from: http://hdl.handle.net/10523/7400

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University of Otago

2. Lennon, Tim. Linking Shallow and Deep Features on the Shelf East and West of Stewart Island .

Degree: University of Otago

The sedimentary basins that have developed to the east and west of Stewart Island are linked through similar tectonic and depositional processes during their formation. The sediment supply and tectonic rifting phases are common to both basins, while sedimentation rates and tectonic subsidence define their unique characteristics. To the east, the Great South Basin is the Campbell Plateau's largest sedimentary basin; it has accumulated up to 8.6 km of sediment since it was formed during mid-Cretaceous rifting related to the separation of New Zealand from western Antarctica. West of Stewart Island lies the Solander Basin, which formed during the Cretaceous - late Eocene extensional regime that led to the opening of the Tasman Sea. Hydrocarbon exploration using seismic and well data has suggested that some of the rift basins formed by the spreading of the Tasman Sea and the break-up of Gondwana have become significant petroleum basin depocentres. In this thesis, high-resolution seismic data have been used in conjunction with existing data to further investigate the geological history and hydrocarbon potential of these basins. Several specific features are addressed as outlined below. On the southeastern side of Stewart Island, a detachment fault associated with late Cretaceous rifting from Gondwana has previously been proposed for the region. Information on the offshore geometry and extent of this, the Sisters Shear Zone, is limited - particularly with regard to its morphology and geological history. Recent work has allowed the dating of rifting episodes across the zone, but its general form is still mostly unknown. This study investigates the shear zone using high-resolution seismic imaging to reconstruct seafloor morphology and shallow fault geometry. High frequency, sub-bottom images were acquired aboard the University of Otago's R/V Polaris II, while seismic processing and interpretation techniques have been employed to investigate the shallow geometry and location of the offshore segment of this proposed detachment fault. On the west side of Stewart Island, a 240-km-long line of multi-channel seismic reflection data, recorded aboard R/V Maurice Ewing in 1996, has imaged several complex structural features along the shelf adjacent to the Solander Basin. Reprocessing of these data and further high-resolution imaging focuses on faulting that appears to outcrop on the seafloor, as well as inferred erosional features on the shelf margin. The collection of high-frequency boomer data in January 2009 has improved the resolution and interpretability of these features. Direct comparison of single-channel boomer data and multi-channel reflection data has revealed several near surface features which are below the Rayleigh resolution limit of the older low-frequency data, including a Bottom Simulating Reflection and turbidity/contour current erosional features. Advisors/Committee Members: Gorman, Andrew R (advisor).

Subjects/Keywords: Geophysics; Stewart Island; New Zealand; Solander Basin; Great South Basin; Oil; Gas; Hydrate; Gas Hydrate; shelf margin; Boomer; Seismic; seismic stratigraphy; sequence stratigraphy

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

APA (6th Edition):

Lennon, T. (n.d.). Linking Shallow and Deep Features on the Shelf East and West of Stewart Island . (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/5058

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16th Edition):

Lennon, Tim. “Linking Shallow and Deep Features on the Shelf East and West of Stewart Island .” Masters Thesis, University of Otago. Accessed October 15, 2019. http://hdl.handle.net/10523/5058.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7th Edition):

Lennon, Tim. “Linking Shallow and Deep Features on the Shelf East and West of Stewart Island .” Web. 15 Oct 2019.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Lennon T. Linking Shallow and Deep Features on the Shelf East and West of Stewart Island . [Internet] [Masters thesis]. University of Otago; [cited 2019 Oct 15]. Available from: http://hdl.handle.net/10523/5058.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Lennon T. Linking Shallow and Deep Features on the Shelf East and West of Stewart Island . [Masters Thesis]. University of Otago; Available from: http://hdl.handle.net/10523/5058

Note: this citation may be lacking information needed for this citation format:
No year of publication.

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