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Geophysical survey reveals tectonic structures in the Amundsen Sea embayment, West Antarctica

Gohl, K.; Teterin, D.; Eagles, Graeme; Netzeband, G.; Grobys, J.W.G.; Parsiegla, N.; Schlüter, P.; Leinweber, V.; Larter, Robert D.; Uenzelmann-Neben, G.; Udintsev, G.B.. 2007 Geophysical survey reveals tectonic structures in the Amundsen Sea embayment, West Antarctica. In: Cooper, A.K.; Raymond, C.R., (eds.) Antarctica: a keystone in a changing world. Online proceedings of the 10th International Symposium on Antarctic Earth Sciences, Santa Barbara, California, August 26 - September 1, 2007. National Academy Press, 4pp. (U.S. Geological Survey Open-File Report, 2007-1047).

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Abstract/Summary

The Amundsen Sea embayment of West Antarctica is in a prominent location for a series of tectonic and magmatic events from Paleozoic to Cenozoic times. Seismic, magnetic and gravity data from the embayment and Pine Island Bay (PIB) reveal the crustal thickness and some tectonic features. The Moho is 24-22 km deep on the shelf. NE-SW trending magnetic and gravity anomalies and the thin crust indicate a former rift zone that was active during or in the run-up to breakup between Chatham Rise and West Antarctica before or at 90 Ma. NW-SE trending gravity and magnetic anomalies, following a prolongation of Peacock Sound, indicate the extensional southern boundary to the Bellingshausen Plate which was active between 79 and 61 Ma.

Item Type: Publication - Book Section
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Glacial Retreat in Antarctica and Deglaciation of the Earth System
NORA Subject Terms: Earth Sciences
Date made live: 09 Mar 2011 14:23
URI: http://nora.nerc.ac.uk/id/eprint/13754

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