Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica
Abstract Palaeostress inferred from brittle mesostructures in Seymour (Marambio) Island indicates a Cenozoic to Recent origin for an extensional stress field, with only local compressional stress states. Minimum horizontal stress (σ 3 ) orientations are scattered about two main NE–SW and NW–SE modes...
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Online Access: | http://dx.doi.org/10.1017/s0954102007000892 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000892 |
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crcambridgeupr:10.1017/s0954102007000892 2024-09-09T19:09:48+00:00 Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica Maestro, A. López-Martínez, J. Bohoyo, F. Montes, M. Nozal, F. Santillana, S. Marenssi, S. 2008 http://dx.doi.org/10.1017/s0954102007000892 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000892 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 20, issue 2, page 173-184 ISSN 0954-1020 1365-2079 journal-article 2008 crcambridgeupr https://doi.org/10.1017/s0954102007000892 2024-06-19T04:04:30Z Abstract Palaeostress inferred from brittle mesostructures in Seymour (Marambio) Island indicates a Cenozoic to Recent origin for an extensional stress field, with only local compressional stress states. Minimum horizontal stress (σ 3 ) orientations are scattered about two main NE–SW and NW–SE modes suggesting that two stress sources have been responsible for the dominant minimum horizontal stress directions in the north-western Weddell Sea. Extensional structures within a broad-scale compressional stress field can be linked to both the decrease in relative stress magnitudes from active margins to intraplate regions and the rifting processes that occurred in the northern Weddell Sea. Stress states with NW–SE trending σ 3 are compatible with back-arc extension along the eastern Antarctic Peninsula. We interpret this as due to the opening of the Larsen Basin during upper Cretaceous to Eocene and to the spreading, from Pliocene to present, of the Bransfield Basin (western Antarctic Peninsula), both due to former Phoenix Plate subduction under the Antarctic Plate. NE–SW σ 3 orientations could be expressions of continental fragmentation of the northern Antarctic Peninsula controlling eastwards drifting of the South Orkney microcontinent and other submerged continental blocks of the southern Scotia Sea. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Scotia Sea Seymour Island Weddell Sea West Antarctica Cambridge University Press Antarctic Antarctic Peninsula Larsen Basin ENVELOPE(-60.000,-60.000,-68.000,-68.000) Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) Scotia Sea Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) The Antarctic Weddell Weddell Sea West Antarctica Antarctic Science 20 2 173 184 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Palaeostress inferred from brittle mesostructures in Seymour (Marambio) Island indicates a Cenozoic to Recent origin for an extensional stress field, with only local compressional stress states. Minimum horizontal stress (σ 3 ) orientations are scattered about two main NE–SW and NW–SE modes suggesting that two stress sources have been responsible for the dominant minimum horizontal stress directions in the north-western Weddell Sea. Extensional structures within a broad-scale compressional stress field can be linked to both the decrease in relative stress magnitudes from active margins to intraplate regions and the rifting processes that occurred in the northern Weddell Sea. Stress states with NW–SE trending σ 3 are compatible with back-arc extension along the eastern Antarctic Peninsula. We interpret this as due to the opening of the Larsen Basin during upper Cretaceous to Eocene and to the spreading, from Pliocene to present, of the Bransfield Basin (western Antarctic Peninsula), both due to former Phoenix Plate subduction under the Antarctic Plate. NE–SW σ 3 orientations could be expressions of continental fragmentation of the northern Antarctic Peninsula controlling eastwards drifting of the South Orkney microcontinent and other submerged continental blocks of the southern Scotia Sea. |
format |
Article in Journal/Newspaper |
author |
Maestro, A. López-Martínez, J. Bohoyo, F. Montes, M. Nozal, F. Santillana, S. Marenssi, S. |
spellingShingle |
Maestro, A. López-Martínez, J. Bohoyo, F. Montes, M. Nozal, F. Santillana, S. Marenssi, S. Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica |
author_facet |
Maestro, A. López-Martínez, J. Bohoyo, F. Montes, M. Nozal, F. Santillana, S. Marenssi, S. |
author_sort |
Maestro, A. |
title |
Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica |
title_short |
Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica |
title_full |
Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica |
title_fullStr |
Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica |
title_full_unstemmed |
Geodynamic implications of the Cenozoic stress field on Seymour Island, West Antarctica |
title_sort |
geodynamic implications of the cenozoic stress field on seymour island, west antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1017/s0954102007000892 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000892 |
long_lat |
ENVELOPE(-60.000,-60.000,-68.000,-68.000) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic Antarctic Peninsula Larsen Basin Marambio Scotia Sea Seymour Seymour Island The Antarctic Weddell Weddell Sea West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Larsen Basin Marambio Scotia Sea Seymour Seymour Island The Antarctic Weddell Weddell Sea West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Scotia Sea Seymour Island Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Scotia Sea Seymour Island Weddell Sea West Antarctica |
op_source |
Antarctic Science volume 20, issue 2, page 173-184 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102007000892 |
container_title |
Antarctic Science |
container_volume |
20 |
container_issue |
2 |
container_start_page |
173 |
op_container_end_page |
184 |
_version_ |
1809824095855968256 |