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

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Gohl, K. , Teterin, D. , Eagles, G. , Netzeband, G. , Grobys, J. , Parsiegla, N. , Schlüter, P. , Leinweber, V. T. , Larter, R. D. , Uenzelmann-Neben, G. and Udintsev, G. B. (2007): Geophysical survey reveals tectonic structures in the Amundsen Sea embayment, West Antarctica , Proceedings for the 10th International Symposium on Antarctic Earth Sciences, Santa Barbara, 26 Aug - 1 Sept 2007 , U.S. Geological Survey and The National Academies; USGS OF- .
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Abstract:

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.

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