Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica
New whole rock Rb-Sr and zircon U-Pb geochronological data and Sm-Nd isotopic data are presented from the central magmatic arc domain of the Antarctic Peninsula in the area of northwest Palmer Land and southwest Graham Land, Rb-Sr isochrons indicate an age of 169±6 Ma for basement orthogneisses and...
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Cambridge University Press
2009
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ftnerc:oai:nora.nerc.ac.uk:8695 2023-05-15T14:05:16+02:00 Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica Leat, Philip Flowerdew, Michael Riley, Teal Whitehouse, M.J. Scarrow, J.H. Millar, Ian 2009 text http://nora.nerc.ac.uk/id/eprint/8695/ https://nora.nerc.ac.uk/id/eprint/8695/1/Ant_Sci_for_NORA.pdf en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/8695/1/Ant_Sci_for_NORA.pdf Leat, Philip; Flowerdew, Michael; Riley, Teal orcid:0000-0002-3333-5021 Whitehouse, M.J.; Scarrow, J.H.; Millar, Ian. 2009 Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica. Antarctic Science, 21 (6). 633-641. https://doi.org/10.1017/S0954102009990320 <https://doi.org/10.1017/S0954102009990320> Earth Sciences Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.1017/S0954102009990320 2023-02-04T19:25:38Z New whole rock Rb-Sr and zircon U-Pb geochronological data and Sm-Nd isotopic data are presented from the central magmatic arc domain of the Antarctic Peninsula in the area of northwest Palmer Land and southwest Graham Land, Rb-Sr isochrons indicate an age of 169±6 Ma for basement orthogneisses and 132±9 to 71±9 Ma for plutons. A U-Pb age of 183 ± 2.1 Ma, with no detectable inheritance, on zircons from an orthogneiss from Cape Berteaux provides the first reliable age for the orthogneisses, which are interpreted as metamorphosed silicic volcanic rocks, and Sm-Nd data indicate derivation in a mature volcanic arc. The age indicates they may be correlatives of the Jurassic ‘Chon Aike’ volcanism of the eastern Antarctic Peninsula. A U-Pb zircon age of 107 ± 1.7 Ma on a terrestrial volcanic sequence overlying an uncomformity strongly suggests a mid-Cretaceous age for the extensive volcanic cover of northwest Palmer Land that was previously thought to be Jurassic. The unconformity is interpreted to have been a result of compressional uplift related to the Palmer Land event. This is the first date for the event in the western part of the central magmatic arc terrane of the Antarctic Peninsula. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Graham Land Palmer Land Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Graham Land ENVELOPE(-63.500,-63.500,-66.000,-66.000) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) Berteaux ENVELOPE(-67.458,-67.458,-68.850,-68.850) Cape Berteaux ENVELOPE(-67.483,-67.483,-68.833,-68.833) Antarctic Science 21 6 633 641 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Leat, Philip Flowerdew, Michael Riley, Teal Whitehouse, M.J. Scarrow, J.H. Millar, Ian Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica |
topic_facet |
Earth Sciences |
description |
New whole rock Rb-Sr and zircon U-Pb geochronological data and Sm-Nd isotopic data are presented from the central magmatic arc domain of the Antarctic Peninsula in the area of northwest Palmer Land and southwest Graham Land, Rb-Sr isochrons indicate an age of 169±6 Ma for basement orthogneisses and 132±9 to 71±9 Ma for plutons. A U-Pb age of 183 ± 2.1 Ma, with no detectable inheritance, on zircons from an orthogneiss from Cape Berteaux provides the first reliable age for the orthogneisses, which are interpreted as metamorphosed silicic volcanic rocks, and Sm-Nd data indicate derivation in a mature volcanic arc. The age indicates they may be correlatives of the Jurassic ‘Chon Aike’ volcanism of the eastern Antarctic Peninsula. A U-Pb zircon age of 107 ± 1.7 Ma on a terrestrial volcanic sequence overlying an uncomformity strongly suggests a mid-Cretaceous age for the extensive volcanic cover of northwest Palmer Land that was previously thought to be Jurassic. The unconformity is interpreted to have been a result of compressional uplift related to the Palmer Land event. This is the first date for the event in the western part of the central magmatic arc terrane of the Antarctic Peninsula. |
format |
Article in Journal/Newspaper |
author |
Leat, Philip Flowerdew, Michael Riley, Teal Whitehouse, M.J. Scarrow, J.H. Millar, Ian |
author_facet |
Leat, Philip Flowerdew, Michael Riley, Teal Whitehouse, M.J. Scarrow, J.H. Millar, Ian |
author_sort |
Leat, Philip |
title |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica |
title_short |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica |
title_full |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica |
title_fullStr |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica |
title_full_unstemmed |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica |
title_sort |
zircon u-pb dating of mesozoic volcanic and tectonic events in northwest palmer land and southwest graham land, antarctica |
publisher |
Cambridge University Press |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/8695/ https://nora.nerc.ac.uk/id/eprint/8695/1/Ant_Sci_for_NORA.pdf |
long_lat |
ENVELOPE(-63.500,-63.500,-66.000,-66.000) ENVELOPE(-65.000,-65.000,-71.500,-71.500) ENVELOPE(-67.458,-67.458,-68.850,-68.850) ENVELOPE(-67.483,-67.483,-68.833,-68.833) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Graham Land Palmer Land Berteaux Cape Berteaux |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Graham Land Palmer Land Berteaux Cape Berteaux |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Graham Land Palmer Land |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Graham Land Palmer Land |
op_relation |
https://nora.nerc.ac.uk/id/eprint/8695/1/Ant_Sci_for_NORA.pdf Leat, Philip; Flowerdew, Michael; Riley, Teal orcid:0000-0002-3333-5021 Whitehouse, M.J.; Scarrow, J.H.; Millar, Ian. 2009 Zircon U-Pb dating of Mesozoic volcanic and tectonic events in northwest Palmer Land and southwest Graham Land, Antarctica. Antarctic Science, 21 (6). 633-641. https://doi.org/10.1017/S0954102009990320 <https://doi.org/10.1017/S0954102009990320> |
op_doi |
https://doi.org/10.1017/S0954102009990320 |
container_title |
Antarctic Science |
container_volume |
21 |
container_issue |
6 |
container_start_page |
633 |
op_container_end_page |
641 |
_version_ |
1766277085623484416 |