Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints
Paleomagnetic data from the Antarctic Peninsula and our recent results from the Ellsworth-Whitmore Mountains block suggest that since the Middle Jurassic these two West Antarctic blocks have undergone little relative movement and together have rotated relative to the East Antarctic craton. New data...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8TX3QVT 2023-05-15T13:50:01+02:00 Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints Grunow, Anne M. Kent, Dennis V. Dalziel, Ian W. D. 1987 https://doi.org/10.7916/D8TX3QVT English eng https://doi.org/10.7916/D8TX3QVT Geophysics Articles 1987 ftcolumbiauniv https://doi.org/10.7916/D8TX3QVT 2019-04-04T08:07:03Z Paleomagnetic data from the Antarctic Peninsula and our recent results from the Ellsworth-Whitmore Mountains block suggest that since the Middle Jurassic these two West Antarctic blocks have undergone little relative movement and together have rotated relative to the East Antarctic craton. New data from Lower Cretaceous rocks from the Thurston Island region of West Antarctica suggest that on the basis of paleomagnetic constraints, the Antarctic Peninsula, Ellsworth-Whitmore Mountains and Thurston Island blocks define a single entity which we call Weddellia; some motion between these blocks is possible within the limits of the paleomagnetic data. Between the Middle Jurassic and Early Cretaceous, Weddellia remained attached to West Gondwanaland while East Antarctica moved southward (dextrally) relative to Weddellia. From the Early Cretaceous to mid-Cretaceous, Weddellia rotated clockwise 30° and moved sinistrally approximately 2500 km relative to East Antarctica, to its present-day position. We suggest the Early to mid-Cretaceous to be the time of the main if not initial opening of the Weddell Sea. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Thurston Island Weddell Sea West Antarctica Columbia University: Academic Commons Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica West Antarctica Weddell Thurston ENVELOPE(-97.500,-97.500,-71.833,-71.833) Thurston Island ENVELOPE(-99.000,-99.000,-72.167,-72.167) Whitmore Mountains ENVELOPE(-104.000,-104.000,-82.500,-82.500) |
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Open Polar |
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Columbia University: Academic Commons |
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ftcolumbiauniv |
language |
English |
topic |
Geophysics |
spellingShingle |
Geophysics Grunow, Anne M. Kent, Dennis V. Dalziel, Ian W. D. Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints |
topic_facet |
Geophysics |
description |
Paleomagnetic data from the Antarctic Peninsula and our recent results from the Ellsworth-Whitmore Mountains block suggest that since the Middle Jurassic these two West Antarctic blocks have undergone little relative movement and together have rotated relative to the East Antarctic craton. New data from Lower Cretaceous rocks from the Thurston Island region of West Antarctica suggest that on the basis of paleomagnetic constraints, the Antarctic Peninsula, Ellsworth-Whitmore Mountains and Thurston Island blocks define a single entity which we call Weddellia; some motion between these blocks is possible within the limits of the paleomagnetic data. Between the Middle Jurassic and Early Cretaceous, Weddellia remained attached to West Gondwanaland while East Antarctica moved southward (dextrally) relative to Weddellia. From the Early Cretaceous to mid-Cretaceous, Weddellia rotated clockwise 30° and moved sinistrally approximately 2500 km relative to East Antarctica, to its present-day position. We suggest the Early to mid-Cretaceous to be the time of the main if not initial opening of the Weddell Sea. |
format |
Article in Journal/Newspaper |
author |
Grunow, Anne M. Kent, Dennis V. Dalziel, Ian W. D. |
author_facet |
Grunow, Anne M. Kent, Dennis V. Dalziel, Ian W. D. |
author_sort |
Grunow, Anne M. |
title |
Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints |
title_short |
Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints |
title_full |
Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints |
title_fullStr |
Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints |
title_full_unstemmed |
Mesozoic evolution of West Antarctica and the Weddell Sea Basin: new paleomagnetic constraints |
title_sort |
mesozoic evolution of west antarctica and the weddell sea basin: new paleomagnetic constraints |
publishDate |
1987 |
url |
https://doi.org/10.7916/D8TX3QVT |
long_lat |
ENVELOPE(-97.500,-97.500,-71.833,-71.833) ENVELOPE(-99.000,-99.000,-72.167,-72.167) ENVELOPE(-104.000,-104.000,-82.500,-82.500) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica West Antarctica Weddell Thurston Thurston Island Whitmore Mountains |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica West Antarctica Weddell Thurston Thurston Island Whitmore Mountains |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Thurston Island Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Thurston Island Weddell Sea West Antarctica |
op_relation |
https://doi.org/10.7916/D8TX3QVT |
op_doi |
https://doi.org/10.7916/D8TX3QVT |
_version_ |
1766252748987170816 |