Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic
Marie Byrd Land (MBL) is the western keystone of West Antarctica. Recent palaeomagnetic results from Lower Cretaceous (c. 117 Ma) plutonic and volcanic rocks from MBL in conjunction with a previous palaeomagnetic result from New Zealand suggest that eastern MBL and the Eastern Province of New Zealan...
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ftdatacite:10.7916/d8np2dsv 2023-05-15T13:56:16+02:00 Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic DiVenere, Victor J. Kent, Dennis V. Dalziel, Ian W. D. 1996 https://dx.doi.org/10.7916/d8np2dsv https://academiccommons.columbia.edu/doi/10.7916/D8NP2DSV unknown Columbia University Geophysics Plate tectonics Text Articles article-journal ScholarlyArticle 1996 ftdatacite https://doi.org/10.7916/d8np2dsv 2021-11-05T12:55:41Z Marie Byrd Land (MBL) is the western keystone of West Antarctica. Recent palaeomagnetic results from Lower Cretaceous (c. 117 Ma) plutonic and volcanic rocks from MBL in conjunction with a previous palaeomagnetic result from New Zealand suggest that eastern MBL and the Eastern Province of New Zealand originated in a position adjacent to Weddellia (Antarctic Peninsula, Thurston Island, and Ellsworth-Whitmore Mountains blocks) as part of a continuous Pacific convergent margin. This is far from their previously assumed position adjacent to the Western Province of New Zealand and North Victoria Land. The 117 Ma palaeomagnetic pole for eastern MBL constrains the last movements of the Weddellia blocks related to spreading in the Weddell Sea to postdate the initial opening phase of the Weddell Sea. A c. 100 Ma pole for the amalgamated mid-Cretaceous MBL is consistent with like age poles from the Thurston Island and Antarctic Peninsula blocks but all are significantly offset from a newly constructed apparent polar wander path for East Antarctica. From this it is concluded that there has been palaeomagnetically resolvable post-100 Ma motion between East Antarctica and the Pacific-bordering blocks of West Antarctica as a result of extension in the Ross Sea, Ross embayment, and Byrd Subglacial Basin. Text Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Marie Byrd Land Ross Sea Thurston Island Victoria Land Weddell Sea West Antarctica DataCite Metadata Store (German National Library of Science and Technology) Antarctic Antarctic Peninsula Weddell Sea East Antarctica Ross Sea West Antarctica Victoria Land Pacific New Zealand Weddell Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) 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) Byrd Subglacial Basin ENVELOPE(-115.000,-115.000,-80.000,-80.000) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Geophysics Plate tectonics |
spellingShingle |
Geophysics Plate tectonics DiVenere, Victor J. Kent, Dennis V. Dalziel, Ian W. D. Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic |
topic_facet |
Geophysics Plate tectonics |
description |
Marie Byrd Land (MBL) is the western keystone of West Antarctica. Recent palaeomagnetic results from Lower Cretaceous (c. 117 Ma) plutonic and volcanic rocks from MBL in conjunction with a previous palaeomagnetic result from New Zealand suggest that eastern MBL and the Eastern Province of New Zealand originated in a position adjacent to Weddellia (Antarctic Peninsula, Thurston Island, and Ellsworth-Whitmore Mountains blocks) as part of a continuous Pacific convergent margin. This is far from their previously assumed position adjacent to the Western Province of New Zealand and North Victoria Land. The 117 Ma palaeomagnetic pole for eastern MBL constrains the last movements of the Weddellia blocks related to spreading in the Weddell Sea to postdate the initial opening phase of the Weddell Sea. A c. 100 Ma pole for the amalgamated mid-Cretaceous MBL is consistent with like age poles from the Thurston Island and Antarctic Peninsula blocks but all are significantly offset from a newly constructed apparent polar wander path for East Antarctica. From this it is concluded that there has been palaeomagnetically resolvable post-100 Ma motion between East Antarctica and the Pacific-bordering blocks of West Antarctica as a result of extension in the Ross Sea, Ross embayment, and Byrd Subglacial Basin. |
format |
Text |
author |
DiVenere, Victor J. Kent, Dennis V. Dalziel, Ian W. D. |
author_facet |
DiVenere, Victor J. Kent, Dennis V. Dalziel, Ian W. D. |
author_sort |
DiVenere, Victor J. |
title |
Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic |
title_short |
Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic |
title_full |
Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic |
title_fullStr |
Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic |
title_full_unstemmed |
Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic |
title_sort |
summary of palaeomagnetic results from west antarctica: implications for the tectonic evolution of the pacific margin of gondwana during the mesozoic |
publisher |
Columbia University |
publishDate |
1996 |
url |
https://dx.doi.org/10.7916/d8np2dsv https://academiccommons.columbia.edu/doi/10.7916/D8NP2DSV |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) 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) ENVELOPE(-115.000,-115.000,-80.000,-80.000) |
geographic |
Antarctic Antarctic Peninsula Weddell Sea East Antarctica Ross Sea West Antarctica Victoria Land Pacific New Zealand Weddell Byrd Marie Byrd Land Thurston Thurston Island Whitmore Mountains Byrd Subglacial Basin |
geographic_facet |
Antarctic Antarctic Peninsula Weddell Sea East Antarctica Ross Sea West Antarctica Victoria Land Pacific New Zealand Weddell Byrd Marie Byrd Land Thurston Thurston Island Whitmore Mountains Byrd Subglacial Basin |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Marie Byrd Land Ross Sea Thurston Island Victoria Land Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Marie Byrd Land Ross Sea Thurston Island Victoria Land Weddell Sea West Antarctica |
op_doi |
https://doi.org/10.7916/d8np2dsv |
_version_ |
1766263634184372224 |