A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana
The continental margin of Gondwana preserves a record of long-lived magmatism from the Andean Cordillera to Australia. The crustal blocks of West Antarctica form part of this margin, with Palaeozoic–Mesozoic magmatism particularly well preserved in the Antarctic Peninsula and Marie Byrd Land. Magmat...
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Cambridge University Press
2017
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Online Access: | http://nora.nerc.ac.uk/id/eprint/513420/ https://nora.nerc.ac.uk/id/eprint/513420/1/Riley%20et%20al%20%20%20Ant%20Sci.pdf https://doi.org/10.1017/S0954102016000341 |
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ftnerc:oai:nora.nerc.ac.uk:513420 2023-05-15T13:49:32+02:00 A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana Riley, T.R. Flowerdew, M.J. Pankhurst, R.J. Leat, P.T. Millar, I.L Fanning, C.M. Whitehouse, M.J. 2017-01 text http://nora.nerc.ac.uk/id/eprint/513420/ https://nora.nerc.ac.uk/id/eprint/513420/1/Riley%20et%20al%20%20%20Ant%20Sci.pdf https://doi.org/10.1017/S0954102016000341 en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/513420/1/Riley%20et%20al%20%20%20Ant%20Sci.pdf Riley, T.R. orcid:0000-0002-3333-5021 Flowerdew, M.J.; Pankhurst, R.J.; Leat, P.T.; Millar, I.L; Fanning, C.M.; Whitehouse, M.J. 2017 A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana. Antarctic Science, 29 (1). 47-60. https://doi.org/10.1017/S0954102016000341 <https://doi.org/10.1017/S0954102016000341> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1017/S0954102016000341 2023-02-04T19:42:55Z The continental margin of Gondwana preserves a record of long-lived magmatism from the Andean Cordillera to Australia. The crustal blocks of West Antarctica form part of this margin, with Palaeozoic–Mesozoic magmatism particularly well preserved in the Antarctic Peninsula and Marie Byrd Land. Magmatic events on the intervening Thurston Island crustal block are poorly defined, which has hindered accurate correlations along the margin. Six samples are dated here using U-Pb geochronology and cover the geological history on Thurston Island. The basement gneisses from Morgan Inlet have a protolith age of 349±2 Ma and correlate closely with the Devonian–Carboniferous magmatism of Marie Byrd Land and New Zealand. Triassic (240–220 Ma) magmatism is identified at two sites on Thurston Island, with Hf isotopes indicating magma extraction from Mesoproterozoic-age lower crust. Several sites on Thurston Island preserve rhyolitic tuffs that have been dated at 182 Ma and are likely to correlate with the successions in the Antarctic Peninsula, particularly given the pre-break-up position of the Thurston Island crustal block. Silicic volcanism was widespread in Patagonia and the Antarctic Peninsula at ~ 183 Ma forming the extensive Chon Aike Province. The most extensive episode of magmatism along the active margin took place during the mid-Cretaceous. This Cordillera ‘flare-up’ event of the Gondwana margin is also developed on Thurston Island with granitoid magmatism dated in the interval 110–100 Ma. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Marie Byrd Land Thurston Island West Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Patagonia West Antarctica Pacific New Zealand 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) Morgan Inlet ENVELOPE(-96.000,-96.000,-72.267,-72.267) Antarctic Science 29 1 47 60 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The continental margin of Gondwana preserves a record of long-lived magmatism from the Andean Cordillera to Australia. The crustal blocks of West Antarctica form part of this margin, with Palaeozoic–Mesozoic magmatism particularly well preserved in the Antarctic Peninsula and Marie Byrd Land. Magmatic events on the intervening Thurston Island crustal block are poorly defined, which has hindered accurate correlations along the margin. Six samples are dated here using U-Pb geochronology and cover the geological history on Thurston Island. The basement gneisses from Morgan Inlet have a protolith age of 349±2 Ma and correlate closely with the Devonian–Carboniferous magmatism of Marie Byrd Land and New Zealand. Triassic (240–220 Ma) magmatism is identified at two sites on Thurston Island, with Hf isotopes indicating magma extraction from Mesoproterozoic-age lower crust. Several sites on Thurston Island preserve rhyolitic tuffs that have been dated at 182 Ma and are likely to correlate with the successions in the Antarctic Peninsula, particularly given the pre-break-up position of the Thurston Island crustal block. Silicic volcanism was widespread in Patagonia and the Antarctic Peninsula at ~ 183 Ma forming the extensive Chon Aike Province. The most extensive episode of magmatism along the active margin took place during the mid-Cretaceous. This Cordillera ‘flare-up’ event of the Gondwana margin is also developed on Thurston Island with granitoid magmatism dated in the interval 110–100 Ma. |
format |
Article in Journal/Newspaper |
author |
Riley, T.R. Flowerdew, M.J. Pankhurst, R.J. Leat, P.T. Millar, I.L Fanning, C.M. Whitehouse, M.J. |
spellingShingle |
Riley, T.R. Flowerdew, M.J. Pankhurst, R.J. Leat, P.T. Millar, I.L Fanning, C.M. Whitehouse, M.J. A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana |
author_facet |
Riley, T.R. Flowerdew, M.J. Pankhurst, R.J. Leat, P.T. Millar, I.L Fanning, C.M. Whitehouse, M.J. |
author_sort |
Riley, T.R. |
title |
A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana |
title_short |
A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana |
title_full |
A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana |
title_fullStr |
A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana |
title_full_unstemmed |
A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana |
title_sort |
revised geochronology of thurston island, west antarctica and correlations along the proto-pacific margin of gondwana |
publisher |
Cambridge University Press |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/513420/ https://nora.nerc.ac.uk/id/eprint/513420/1/Riley%20et%20al%20%20%20Ant%20Sci.pdf https://doi.org/10.1017/S0954102016000341 |
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(-96.000,-96.000,-72.267,-72.267) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Patagonia West Antarctica Pacific New Zealand Byrd Marie Byrd Land Thurston Thurston Island Morgan Inlet |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Patagonia West Antarctica Pacific New Zealand Byrd Marie Byrd Land Thurston Thurston Island Morgan Inlet |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Marie Byrd Land Thurston Island West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Marie Byrd Land Thurston Island West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/513420/1/Riley%20et%20al%20%20%20Ant%20Sci.pdf Riley, T.R. orcid:0000-0002-3333-5021 Flowerdew, M.J.; Pankhurst, R.J.; Leat, P.T.; Millar, I.L; Fanning, C.M.; Whitehouse, M.J. 2017 A revised geochronology of Thurston Island, West Antarctica and correlations along the proto-Pacific margin of Gondwana. Antarctic Science, 29 (1). 47-60. https://doi.org/10.1017/S0954102016000341 <https://doi.org/10.1017/S0954102016000341> |
op_doi |
https://doi.org/10.1017/S0954102016000341 |
container_title |
Antarctic Science |
container_volume |
29 |
container_issue |
1 |
container_start_page |
47 |
op_container_end_page |
60 |
_version_ |
1766251529574023168 |