Origin, structural and tectonic history of the Macquarie Island region
Macquarie Island, in the Southern Ocean, was formed by oceanic crust uplift due to transpressive forces between the Indian / Australian and Pacific oceanic plates, in a transpressional regime which has persisted over the last 10 Ma. The amount of uplift is affected by regional isostatic compensation...
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1988
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Online Access: | https://eprints.utas.edu.au/13863/ https://eprints.utas.edu.au/13863/4/1988_Williamson_origin.pdf |
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ftunivtasmania:oai:eprints.utas.edu.au:13863 2023-05-15T14:00:15+02:00 Origin, structural and tectonic history of the Macquarie Island region Williamson, PE 1988 application/pdf https://eprints.utas.edu.au/13863/ https://eprints.utas.edu.au/13863/4/1988_Williamson_origin.pdf en eng https://eprints.utas.edu.au/13863/4/1988_Williamson_origin.pdf Williamson, PE 1988 , 'Origin, structural and tectonic history of the Macquarie Island region' , Papers and Proceedings of the Royal Society of Tasmania, vol. 122, no. 1 , pp. 27-43 , doi:10.26749/rstpp.122.1.27 <http://dx.doi.org/10.26749/rstpp.122.1.27>. cc_utas Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library Article PeerReviewed 1988 ftunivtasmania https://doi.org/10.26749/rstpp.122.1.27 2020-05-30T07:27:38Z Macquarie Island, in the Southern Ocean, was formed by oceanic crust uplift due to transpressive forces between the Indian / Australian and Pacific oceanic plates, in a transpressional regime which has persisted over the last 10 Ma. The amount of uplift is affected by regional isostatic compensation for crustal thickening; accompanying effects are tilting of rocks and rotation of the southern segment of the island. Gabbro and serpentinite, in the north, and basalts, in the south, all of which were formed in the primary oceanic crust, are now exposed. Consequently, magnetic properties of igneous rocks on the island correlate with similar features on the Indian plate which is on both sides of it. In conflict with evidence from younger palaeontological and potassium-argon (K-Ar) dating, which may reflect later episodes, this suggests that the original oceanic crust composing the island was formed at the Indian-Antarctic accreting mid-oceanic ridge around the time of anomaly 7 (27 Ma BY.). Article in Journal/Newspaper Antarc* Antarctic Macquarie Island Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean Pacific Indian Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Papers and Proceedings of The Royal Society of Tasmania 122 1 27 43 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library |
spellingShingle |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library Williamson, PE Origin, structural and tectonic history of the Macquarie Island region |
topic_facet |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library |
description |
Macquarie Island, in the Southern Ocean, was formed by oceanic crust uplift due to transpressive forces between the Indian / Australian and Pacific oceanic plates, in a transpressional regime which has persisted over the last 10 Ma. The amount of uplift is affected by regional isostatic compensation for crustal thickening; accompanying effects are tilting of rocks and rotation of the southern segment of the island. Gabbro and serpentinite, in the north, and basalts, in the south, all of which were formed in the primary oceanic crust, are now exposed. Consequently, magnetic properties of igneous rocks on the island correlate with similar features on the Indian plate which is on both sides of it. In conflict with evidence from younger palaeontological and potassium-argon (K-Ar) dating, which may reflect later episodes, this suggests that the original oceanic crust composing the island was formed at the Indian-Antarctic accreting mid-oceanic ridge around the time of anomaly 7 (27 Ma BY.). |
format |
Article in Journal/Newspaper |
author |
Williamson, PE |
author_facet |
Williamson, PE |
author_sort |
Williamson, PE |
title |
Origin, structural and tectonic history of the Macquarie Island region |
title_short |
Origin, structural and tectonic history of the Macquarie Island region |
title_full |
Origin, structural and tectonic history of the Macquarie Island region |
title_fullStr |
Origin, structural and tectonic history of the Macquarie Island region |
title_full_unstemmed |
Origin, structural and tectonic history of the Macquarie Island region |
title_sort |
origin, structural and tectonic history of the macquarie island region |
publishDate |
1988 |
url |
https://eprints.utas.edu.au/13863/ https://eprints.utas.edu.au/13863/4/1988_Williamson_origin.pdf |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Antarctic Southern Ocean Pacific Indian Tilting |
geographic_facet |
Antarctic Southern Ocean Pacific Indian Tilting |
genre |
Antarc* Antarctic Macquarie Island Southern Ocean |
genre_facet |
Antarc* Antarctic Macquarie Island Southern Ocean |
op_relation |
https://eprints.utas.edu.au/13863/4/1988_Williamson_origin.pdf Williamson, PE 1988 , 'Origin, structural and tectonic history of the Macquarie Island region' , Papers and Proceedings of the Royal Society of Tasmania, vol. 122, no. 1 , pp. 27-43 , doi:10.26749/rstpp.122.1.27 <http://dx.doi.org/10.26749/rstpp.122.1.27>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.26749/rstpp.122.1.27 |
container_title |
Papers and Proceedings of The Royal Society of Tasmania |
container_volume |
122 |
container_issue |
1 |
container_start_page |
27 |
op_container_end_page |
43 |
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1766269260048367616 |