Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica
Abstract 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 north-west Palmer Land and south-west Graham Land, Rb-Sr isochrons indicate an age of 169 ± 6 Ma for basement ortho...
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crcambridgeupr:10.1017/s0954102009990320 2024-03-03T08:37:55+00:00 Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica Leat, P.T. Flowerdew, M.J. Riley, T.R. Whitehouse, M.J. Scarrow, J.H. Millar, I.L. 2009 http://dx.doi.org/10.1017/s0954102009990320 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009990320 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 21, issue 6, page 633-641 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2009 crcambridgeupr https://doi.org/10.1017/s0954102009990320 2024-02-08T08:34:57Z Abstract 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 north-west Palmer Land and south-west 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 north-west 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 Cambridge University Press 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 |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Leat, P.T. Flowerdew, M.J. Riley, T.R. Whitehouse, M.J. Scarrow, J.H. Millar, I.L. Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract 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 north-west Palmer Land and south-west 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 north-west 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, P.T. Flowerdew, M.J. Riley, T.R. Whitehouse, M.J. Scarrow, J.H. Millar, I.L. |
author_facet |
Leat, P.T. Flowerdew, M.J. Riley, T.R. Whitehouse, M.J. Scarrow, J.H. Millar, I.L. |
author_sort |
Leat, P.T. |
title |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica |
title_short |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica |
title_full |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica |
title_fullStr |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica |
title_full_unstemmed |
Zircon U-Pb dating of Mesozoic volcanic and tectonic events in north-west Palmer Land and south-west Graham Land, Antarctica |
title_sort |
zircon u-pb dating of mesozoic volcanic and tectonic events in north-west palmer land and south-west graham land, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2009 |
url |
http://dx.doi.org/10.1017/s0954102009990320 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009990320 |
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_source |
Antarctic Science volume 21, issue 6, page 633-641 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
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 |
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1792502800014376960 |