Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica
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. It played a central role in the rifting and break-up of greater New Zealand from West Antarctica as it is the location where the junction of Chatham...
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ftawi:oai:epic.awi.de:17320 2024-09-15T17:39:00+00:00 Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica Gohl, Karsten Eagles, G. Grobys, Jan Larter, R. D. Netzeband, G. Parsiegla, Nicole Teterin, D. 2007 https://epic.awi.de/id/eprint/17320/ https://hdl.handle.net/10013/epic.27652 unknown Gohl, K. orcid:0000-0002-9558-2116 , Eagles, G. , Grobys, J. , Larter, R. D. , Netzeband, G. , Parsiegla, N. and Teterin, D. (2007) Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica , AGU Fall Meeting, San Francisco. . hdl:10013/epic.27652 EPIC3AGU Fall Meeting, San Francisco. Conference notRev 2007 ftawi 2024-06-24T04:00:13Z 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. It played a central role in the rifting and break-up of greater New Zealand from West Antarctica as it is the location where the junction of Chatham Rise and Campbell Plateau (New Zealand) lies conjugate to the West Antarctic margin. New seismic, magnetic and gravity data from the Amundsen Sea Embayment and Pine Island Bay reveal the crustal thickness and tectonic lineations. 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 between Thurston Island and Ellsworth Land, indicate the extensional southern boundary to the Bellingshausen Plate which was active between 79 and 61 Ma. However, both lineation trends, NE-SW and NW-SE, seem to be observed over broad regions. This infers stepwise and multiple rift and extension phases over a wide period of time before, during and after the break-up between New Zealand and West Antarctica. Conference Object Amundsen Sea Antarc* Antarctic Antarctica Pine Island Pine Island Bay Thurston Island West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
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. It played a central role in the rifting and break-up of greater New Zealand from West Antarctica as it is the location where the junction of Chatham Rise and Campbell Plateau (New Zealand) lies conjugate to the West Antarctic margin. New seismic, magnetic and gravity data from the Amundsen Sea Embayment and Pine Island Bay reveal the crustal thickness and tectonic lineations. 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 between Thurston Island and Ellsworth Land, indicate the extensional southern boundary to the Bellingshausen Plate which was active between 79 and 61 Ma. However, both lineation trends, NE-SW and NW-SE, seem to be observed over broad regions. This infers stepwise and multiple rift and extension phases over a wide period of time before, during and after the break-up between New Zealand and West Antarctica. |
format |
Conference Object |
author |
Gohl, Karsten Eagles, G. Grobys, Jan Larter, R. D. Netzeband, G. Parsiegla, Nicole Teterin, D. |
spellingShingle |
Gohl, Karsten Eagles, G. Grobys, Jan Larter, R. D. Netzeband, G. Parsiegla, Nicole Teterin, D. Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica |
author_facet |
Gohl, Karsten Eagles, G. Grobys, Jan Larter, R. D. Netzeband, G. Parsiegla, Nicole Teterin, D. |
author_sort |
Gohl, Karsten |
title |
Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica |
title_short |
Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica |
title_full |
Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica |
title_fullStr |
Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica |
title_full_unstemmed |
Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica |
title_sort |
rift tectonics in the amundsen sea embayment: stepwise break-up of new zealand from west antarctica |
publishDate |
2007 |
url |
https://epic.awi.de/id/eprint/17320/ https://hdl.handle.net/10013/epic.27652 |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Pine Island Pine Island Bay Thurston Island West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Pine Island Pine Island Bay Thurston Island West Antarctica |
op_source |
EPIC3AGU Fall Meeting, San Francisco. |
op_relation |
Gohl, K. orcid:0000-0002-9558-2116 , Eagles, G. , Grobys, J. , Larter, R. D. , Netzeband, G. , Parsiegla, N. and Teterin, D. (2007) Rift tectonics in the Amundsen Sea Embayment: Stepwise break-up of New Zealand from West Antarctica , AGU Fall Meeting, San Francisco. . hdl:10013/epic.27652 |
_version_ |
1810476723352895488 |