Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics
An understanding of the glacial history of the Amundsen Sea Embayment (ASE) and Pine Island Bay (PIB) is essential for proposing models on the future development of the West Antarctic Ice Sheet. This requires an understanding of the tectonic history and knowledge of tectonic features such as lineame...
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ftawi:oai:epic.awi.de:20805 2023-05-15T13:23:49+02:00 Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics Gohl, Karsten 2009 https://epic.awi.de/id/eprint/20805/ https://hdl.handle.net/10013/epic.33021 unknown Gohl, K. orcid:0000-0002-9558-2116 (2009) Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics , First Antarctic Climate Evolution Symposium, GranadaSept 2009 . hdl:10013/epic.33021 EPIC3First Antarctic Climate Evolution Symposium, GranadaSept 2009, 7 Conference notRev 2009 ftawi 2021-12-24T15:33:33Z An understanding of the glacial history of the Amundsen Sea Embayment (ASE) and Pine Island Bay (PIB) is essential for proposing models on the future development of the West Antarctic Ice Sheet. This requires an understanding of the tectonic history and knowledge of tectonic features such as lineaments, ridges, sills and basins, because basement morphology and inherited erosional features control the flow direction of ice-sheets and the influx of Circum-Polar Deep Water (CDW). This is an attempt to reconstruct the tectonic history with the aim to search for basement features and crustal boundaries which may be correlated to the flow and dynamics of the ice-sheet. 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 PIB reveal the crustal thickness and significant tectonic features. NE-SW trending magnetic and gravity anomalies and the thin crust indicate a former rift zone which was active during or in the run-up to the breakup process 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. It is likely that the prominent Pine Island Trough follows a structural boundary between the crustal blocks of Ellsworth Land and Marie Byrd Land. Data are shown from the ASE and PIB which can be interpreted in context with the reconstruction of the ice advance and retreat history in this area. Differences in the behaviour of the ice-sheet are shown to exist for the western and eastern parts of PIB due to basement structures affecting the inflow of CDW. Conference Object Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Marie Byrd Land Pine Island Pine Island Bay West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Amundsen Sea Antarctic Byrd Ellsworth Land ENVELOPE(-85.000,-85.000,-75.000,-75.000) Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Peacock ENVELOPE(169.450,169.450,-72.217,-72.217) Peacock Sound ENVELOPE(-102.000,-102.000,-72.500,-72.500) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) Pine Island Trough ENVELOPE(-101.841,-101.841,-75.011,-75.011) West Antarctic Ice Sheet West Antarctica |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
An understanding of the glacial history of the Amundsen Sea Embayment (ASE) and Pine Island Bay (PIB) is essential for proposing models on the future development of the West Antarctic Ice Sheet. This requires an understanding of the tectonic history and knowledge of tectonic features such as lineaments, ridges, sills and basins, because basement morphology and inherited erosional features control the flow direction of ice-sheets and the influx of Circum-Polar Deep Water (CDW). This is an attempt to reconstruct the tectonic history with the aim to search for basement features and crustal boundaries which may be correlated to the flow and dynamics of the ice-sheet. 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 PIB reveal the crustal thickness and significant tectonic features. NE-SW trending magnetic and gravity anomalies and the thin crust indicate a former rift zone which was active during or in the run-up to the breakup process 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. It is likely that the prominent Pine Island Trough follows a structural boundary between the crustal blocks of Ellsworth Land and Marie Byrd Land. Data are shown from the ASE and PIB which can be interpreted in context with the reconstruction of the ice advance and retreat history in this area. Differences in the behaviour of the ice-sheet are shown to exist for the western and eastern parts of PIB due to basement structures affecting the inflow of CDW. |
format |
Conference Object |
author |
Gohl, Karsten |
spellingShingle |
Gohl, Karsten Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics |
author_facet |
Gohl, Karsten |
author_sort |
Gohl, Karsten |
title |
Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics |
title_short |
Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics |
title_full |
Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics |
title_fullStr |
Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics |
title_full_unstemmed |
Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics |
title_sort |
tectonic architecture of the amundsen sea embayment, west antarctica: basic constraints for ice-sheet dynamics |
publishDate |
2009 |
url |
https://epic.awi.de/id/eprint/20805/ https://hdl.handle.net/10013/epic.33021 |
long_lat |
ENVELOPE(-85.000,-85.000,-75.000,-75.000) ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(169.450,169.450,-72.217,-72.217) ENVELOPE(-102.000,-102.000,-72.500,-72.500) ENVELOPE(-102.000,-102.000,-74.750,-74.750) ENVELOPE(-101.841,-101.841,-75.011,-75.011) |
geographic |
Amundsen Sea Antarctic Byrd Ellsworth Land Island Bay Marie Byrd Land Peacock Peacock Sound Pine Island Bay Pine Island Trough West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Amundsen Sea Antarctic Byrd Ellsworth Land Island Bay Marie Byrd Land Peacock Peacock Sound Pine Island Bay Pine Island Trough West Antarctic Ice Sheet West Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Marie Byrd Land Pine Island Pine Island Bay West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Marie Byrd Land Pine Island Pine Island Bay West Antarctica |
op_source |
EPIC3First Antarctic Climate Evolution Symposium, GranadaSept 2009, 7 |
op_relation |
Gohl, K. orcid:0000-0002-9558-2116 (2009) Tectonic architecture of the Amundsen Sea Embayment, West Antarctica: basic constraints for ice-sheet dynamics , First Antarctic Climate Evolution Symposium, GranadaSept 2009 . hdl:10013/epic.33021 |
_version_ |
1766375570314100736 |