Ice sheets and tectonic architecture: Constraints from West Antarctic margins
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:22417 2023-05-15T13:23:57+02:00 Ice sheets and tectonic architecture: Constraints from West Antarctic margins Gohl, Karsten 2010 https://epic.awi.de/id/eprint/22417/ https://hdl.handle.net/10013/epic.34733 unknown Gohl, K. orcid:0000-0002-9558-2116 (2010) Ice sheets and tectonic architecture: Constraints from West Antarctic margins , IPY Open Science Conference, OsloJune . hdl:10013/epic.34733 EPIC3IPY Open Science Conference, OsloJune, 8, 2010 p. Conference notRev 2010 ftawi 2021-12-24T15:34:13Z 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 Ice sheets and tectonic architecture: Constraints from West Antarctic margins |
author_facet |
Gohl, Karsten |
author_sort |
Gohl, Karsten |
title |
Ice sheets and tectonic architecture: Constraints from West Antarctic margins |
title_short |
Ice sheets and tectonic architecture: Constraints from West Antarctic margins |
title_full |
Ice sheets and tectonic architecture: Constraints from West Antarctic margins |
title_fullStr |
Ice sheets and tectonic architecture: Constraints from West Antarctic margins |
title_full_unstemmed |
Ice sheets and tectonic architecture: Constraints from West Antarctic margins |
title_sort |
ice sheets and tectonic architecture: constraints from west antarctic margins |
publishDate |
2010 |
url |
https://epic.awi.de/id/eprint/22417/ https://hdl.handle.net/10013/epic.34733 |
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 |
EPIC3IPY Open Science Conference, OsloJune, 8, 2010 p. |
op_relation |
Gohl, K. orcid:0000-0002-9558-2116 (2010) Ice sheets and tectonic architecture: Constraints from West Antarctic margins , IPY Open Science Conference, OsloJune . hdl:10013/epic.34733 |
_version_ |
1766376524647235584 |