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Permanent link (DOI): https://doi.org/10.7939/R3D21RS6Z

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The Glacial and Relative Sea Level History of Southern Banks Island, NT, Canada Open Access

Descriptions

Other title
Subject/Keyword
Canadian Arctic
Pleistocene
Laurentide Ice Sheet
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Vaughan, Jessica M
Supervisor and department
England, John (Earth and Atmospheric Sciences)
Examining committee member and department
LeBlanc, Ray (Anthropology)
England, John (Earth and Atmospheric Sciences)
Catuneanu, Octavian (Earth and Atmospheric Sciences)
Froese, Duane (Earth and Atmospheric Sciences)
Waller, Richard (Physical and Geographical Sciences, Keele University, UK)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2014-01-27T13:15:13Z
Graduation date
2014-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
The mapping and dating of surficial glacial landforms and sediments across southern Banks Island document glaciation by the northwest Laurentide Ice Sheet (LIS) during the last glacial maximum. Geomorphic landforms confirm the operation of an ice stream at least 1000 m thick in Amundsen Gulf that was coalescent with thin, cold-based ice crossing the island’s interior, both advancing offshore onto the polar continental shelf. Raised marine shorelines across western and southern Banks Island are barren, recording early withdrawal of the Amundsen Gulf Ice Stream prior to the resubmergence of Bering Strait and the re-entry of Pacific molluscs ~13,750 cal yr BP. This withdrawal resulted in a loss of ~60,000 km2 of ice –triggering drawdown from the primary northwest LIS divide and instigating changes in subsequent ice flow. The Jesse moraine belt on eastern Banks Island records a lateglacial stillstand and/or readvance of Laurentide ice in Prince of Wales Strait (13,750 – 12,750 cal yr BP). Fossiliferous raised marine sediments that onlap the Jesse moraine belt constrain final deglaciation to ~12,600 cal yr BP, a minimum age for the breakup of the Amundsen Gulf Ice Stream. The investigation of a 30 m thick and 6 km wide stratigraphic sequence at Worth Point, southwest Banks Island, identifies an advance of the ancestral LIS during the Mid-Pleistocene (sensu lato), substantially diversifying the glacial record on Banks Island. Glacial ice emplaced during this advance has persisted through at least two glacial-interglacial cycles, demonstrating the resilience of circumpolar permafrost. Pervasive deformation of the stratigraphic sequence also records a detailed history of glaciotectonism in proglacial and subglacial settings that can result from interactions between cold-based ice and permafrost terrain. This newly recognized history rejects the long-established paleoenvironmental model of Worth Point that assumed a simple ‘layer-cake’ stratigraphy.
Language
English
DOI
doi:10.7939/R3D21RS6Z
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Vaughan, J.M, England, J.H, Evans, D.J.A. Glaciotectonic deformation and reinterpretation of the Worth Point stratigraphic sequence: Banks Island, NT, Canada. Quaternary Science Reviews. In Press.

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File size: 59594510
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File author: Jessica Vaughan
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