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Prydz channel fan and the history of extreme ice advances in Prydz Bay
Citation
O'Brien, PE and Cooper, AK and Florindo, F and Handwerger, DA and Lavelle, M and Passchier, S and Pospichal, JJ and Quilty, PG and Richter, C and Theissen, KM and Whitehead, JM, Prydz channel fan and the history of extreme ice advances in Prydz Bay, Proceedings of the Ocean Drilling Program, Scientific Results, 188 pp. 1-32. ISSN 0884-5891 (2004) [Refereed Article]
Abstract
During the late Neogene, the Lambert Glacier-Amery Ice Shelf drainage system flowed across Prydz Bay in an ice stream that reached the shelf edge and built a trough mouth fan on the upper continental slope. The adjacent banks saw mostly subglacial till deposition beneath slower-moving ice. The fan consists mostly of debris flow deposits derived from the melting out of subglacial debris at the grounding line at the continental shelf edge. Thick debris flow intervals are separated by thin mudstone horizons deposited when the ice had retreated from the shelf edge. Age control at Ocean Drilling Program Site 1167 indicates that the bulk of the trough mouth fan was deposited prior to ~780 ka with as few as three debris flow intervals deposited since then. This stratigraphy indicates that extreme advances of the Lambert Glacier-Amery Ice Shelf system ceased during the mid-Pleistocene. Possible causes for this change are progressive over-deepening of the inner shelf, a reduction in maximum ice volumes in the interior of the East Antarctic Ice Sheet caused by temperature change, and a change in the interaction of Milankovich cycles and the response time of the ice sheet.
Item Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Sedimentology |
Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
Objective Group: | Understanding climate change |
Objective Field: | Climate variability (excl. social impacts) |
UTAS Author: | Quilty, PG (Dr Pat Quilty) |
UTAS Author: | Whitehead, JM (Dr Jason Whitehead) |
ID Code: | 32445 |
Year Published: | 2004 |
Deposited By: | IASOS |
Deposited On: | 2005-03-18 |
Last Modified: | 2011-08-01 |
Downloads: | 0 |
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