Geophysical survey reveals tectonic structures in the Amundsen Sea embayment, West Antarctica
Open-File Report
2007-1047-SRP-047
By: K. Gohl, G. Eagles, G. Netzeband, J.W.G. Grobys, N. Parsiegla, P. Schluter, V. Leinweber, R.D. Larter, G. Uenzelmann-Neben, and G.B. Udintsev
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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.
Suggested Citation
Gohl, K., Eagles, G., Netzeband, G., Grobys, J., Parsiegla, N., Schluter, P., Leinweber, V., Larter, R., Uenzelmann-Neben, G., Udintsev, G., 2007, Geophysical survey reveals tectonic structures in the Amundsen Sea embayment, West Antarctica: U.S. Geological Survey Open-File Report 2007-1047-SRP-047, 4 p., https://doi.org/10.3133/ofr20071047SRP047.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Geophysical survey reveals tectonic structures in the Amundsen Sea embayment, West Antarctica |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-047 |
| DOI | 10.3133/ofr20071047SRP047 |
| Year Published | 2007 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 4 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007 |
| Other Geospatial | Antarctica |
| Additional Online Files (Y/N) | N |