Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence
[1] Ice-penetrating radar (mostly airborne) and marine seismic surveys have revealed plateaus and terraces about 100–350 m below sea level beneath parts of the Ross Embayment, including the West Antarctic ice sheet, the Ross Ice Shelf, and the eastern Ross Sea. These surfaces cover many thousands of...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.506.4730 2023-05-15T13:45:53+02:00 Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence Douglas S. Wilson Bruce P. Luyendyk The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.506.4730 http://www.geol.ucsb.edu/faculty/luyendyk/Luyendyk_pdf/Wilson%26Luyendyk2006Gcubed.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.506.4730 http://www.geol.ucsb.edu/faculty/luyendyk/Luyendyk_pdf/Wilson%26Luyendyk2006Gcubed.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geol.ucsb.edu/faculty/luyendyk/Luyendyk_pdf/Wilson%26Luyendyk2006Gcubed.pdf text ftciteseerx 2016-01-08T09:23:51Z [1] Ice-penetrating radar (mostly airborne) and marine seismic surveys have revealed plateaus and terraces about 100–350 m below sea level beneath parts of the Ross Embayment, including the West Antarctic ice sheet, the Ross Ice Shelf, and the eastern Ross Sea. These surfaces cover many thousands of square kilometers and are separated by bedrock troughs occupied by the West Antarctic ice streams. Prominent plateaus are under Edward VII Peninsula, Siple Dome, and Roosevelt Island. Marine seismic data and gravity data over the buried plateaus support an interpretation that they were caused by erosion into basement. The flat and level nature of the surfaces that were formed by erosion, are near the same depth over large distances, and fringe the buried rugged bedrock topography of Marie Byrd Land supports an interpretation of marine rather than glacial erosion. Marine seismic reflection profiles over one of the plateau remnants show it as an angular unconformity cut into gently dipping sediments of late Oligocene age, draped with thin, flat-lying sediments, implying that the plateau is early Miocene or younger. The younger limit for plateau erosion follows from the interpretation of the mechanism: erosion must predate permanent ice along the coast associated with the growth of the West Antarctic ice sheet, probably prior to 10 Ma and possibly prior to 14 Ma. The plateaus along the Siple Coast, with depths around 350 meters, do not rebound to close to sea level and wave base for models of removing past and present ice load. This Text Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Marie Byrd Land Roosevelt Island Ross Ice Shelf Ross Sea West Antarctica Unknown Antarctic Byrd Edward VII Peninsula ENVELOPE(-155.000,-155.000,-77.667,-77.667) Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Roosevelt Island ENVELOPE(-162.000,-162.000,-79.283,-79.283) Ross Ice Shelf Ross Sea Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Coast ENVELOPE(-155.000,-155.000,-82.000,-82.000) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) West Antarctic Ice Sheet West Antarctica |
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Open Polar |
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ftciteseerx |
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English |
description |
[1] Ice-penetrating radar (mostly airborne) and marine seismic surveys have revealed plateaus and terraces about 100–350 m below sea level beneath parts of the Ross Embayment, including the West Antarctic ice sheet, the Ross Ice Shelf, and the eastern Ross Sea. These surfaces cover many thousands of square kilometers and are separated by bedrock troughs occupied by the West Antarctic ice streams. Prominent plateaus are under Edward VII Peninsula, Siple Dome, and Roosevelt Island. Marine seismic data and gravity data over the buried plateaus support an interpretation that they were caused by erosion into basement. The flat and level nature of the surfaces that were formed by erosion, are near the same depth over large distances, and fringe the buried rugged bedrock topography of Marie Byrd Land supports an interpretation of marine rather than glacial erosion. Marine seismic reflection profiles over one of the plateau remnants show it as an angular unconformity cut into gently dipping sediments of late Oligocene age, draped with thin, flat-lying sediments, implying that the plateau is early Miocene or younger. The younger limit for plateau erosion follows from the interpretation of the mechanism: erosion must predate permanent ice along the coast associated with the growth of the West Antarctic ice sheet, probably prior to 10 Ma and possibly prior to 14 Ma. The plateaus along the Siple Coast, with depths around 350 meters, do not rebound to close to sea level and wave base for models of removing past and present ice load. This |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Douglas S. Wilson Bruce P. Luyendyk |
spellingShingle |
Douglas S. Wilson Bruce P. Luyendyk Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence |
author_facet |
Douglas S. Wilson Bruce P. Luyendyk |
author_sort |
Douglas S. Wilson |
title |
Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence |
title_short |
Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence |
title_full |
Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence |
title_fullStr |
Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence |
title_full_unstemmed |
Bedrock platforms within the Ross Embayment, West Antarctica: Hypotheses for ice sheet history, wave erosion, Cenozoic extension, and thermal subsidence |
title_sort |
bedrock platforms within the ross embayment, west antarctica: hypotheses for ice sheet history, wave erosion, cenozoic extension, and thermal subsidence |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.506.4730 http://www.geol.ucsb.edu/faculty/luyendyk/Luyendyk_pdf/Wilson%26Luyendyk2006Gcubed.pdf |
long_lat |
ENVELOPE(-155.000,-155.000,-77.667,-77.667) ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-162.000,-162.000,-79.283,-79.283) ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-155.000,-155.000,-82.000,-82.000) ENVELOPE(-148.833,-148.833,-81.667,-81.667) |
geographic |
Antarctic Byrd Edward VII Peninsula Marie Byrd Land Roosevelt Island Ross Ice Shelf Ross Sea Siple Siple Coast Siple Dome West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic Byrd Edward VII Peninsula Marie Byrd Land Roosevelt Island Ross Ice Shelf Ross Sea Siple Siple Coast Siple Dome West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Marie Byrd Land Roosevelt Island Ross Ice Shelf Ross Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Marie Byrd Land Roosevelt Island Ross Ice Shelf Ross Sea West Antarctica |
op_source |
http://www.geol.ucsb.edu/faculty/luyendyk/Luyendyk_pdf/Wilson%26Luyendyk2006Gcubed.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.506.4730 http://www.geol.ucsb.edu/faculty/luyendyk/Luyendyk_pdf/Wilson%26Luyendyk2006Gcubed.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766231997112385536 |