A temporal control on the isotopic compositions of the Antarctic Peninsula arc
Abstract Radiogenic isotopic compositions of arc magmas are a key tool for studying active margin evolution. They have two isotopic end-members: melts formed mostly from juvenile asthenosphere and melts sourced from evolved continental crust/continental lithospheric mantle. Cordilleran-margins are t...
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ftdoajarticles:oai:doaj.org/article:f5789e98dc814a7c8c4cdd36ea344ba8 2024-09-15T17:48:21+00:00 A temporal control on the isotopic compositions of the Antarctic Peninsula arc Joaquin Bastias-Silva Alex Burton-Johnson David Chew Teal Riley Wuidad Jara Massimo Chiaradia 2024-03-01T00:00:00Z https://doi.org/10.1038/s43247-024-01301-1 https://doaj.org/article/f5789e98dc814a7c8c4cdd36ea344ba8 EN eng Nature Portfolio https://doi.org/10.1038/s43247-024-01301-1 https://doaj.org/toc/2662-4435 doi:10.1038/s43247-024-01301-1 2662-4435 https://doaj.org/article/f5789e98dc814a7c8c4cdd36ea344ba8 Communications Earth & Environment, Vol 5, Iss 1, Pp 1-11 (2024) Geology QE1-996.5 Environmental sciences GE1-350 article 2024 ftdoajarticles https://doi.org/10.1038/s43247-024-01301-1 2024-08-05T17:49:43Z Abstract Radiogenic isotopic compositions of arc magmas are a key tool for studying active margin evolution. They have two isotopic end-members: melts formed mostly from juvenile asthenosphere and melts sourced from evolved continental crust/continental lithospheric mantle. Cordilleran-margins are typically more isotopically juvenile near the trench, and conversely, increasingly evolved landward. However, this model has not been tested on the ~1,500 km long Mesozoic-Cenozoic arc of the Antarctic Peninsula. Here we show that while geochemical compositions remain largely constant, radiogenic isotopes become increasingly juvenile with time. Unlike other continental arcs, there is no association between isotopic composition and spatial distribution. This is attributed to: (i) slow subduction of young oceanic lithosphere, resulting in narrowing of the arc and reduced capacity to incorporate continental crust into melts, and (ii) the Cenozoic decrease in convergence rate, which reduced the friction in the slab-overriding plate interface, allowing the arc melts to increasingly source from young juvenile asthenosphere. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Directory of Open Access Journals: DOAJ Articles Communications Earth & Environment 5 1 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Environmental sciences GE1-350 |
spellingShingle |
Geology QE1-996.5 Environmental sciences GE1-350 Joaquin Bastias-Silva Alex Burton-Johnson David Chew Teal Riley Wuidad Jara Massimo Chiaradia A temporal control on the isotopic compositions of the Antarctic Peninsula arc |
topic_facet |
Geology QE1-996.5 Environmental sciences GE1-350 |
description |
Abstract Radiogenic isotopic compositions of arc magmas are a key tool for studying active margin evolution. They have two isotopic end-members: melts formed mostly from juvenile asthenosphere and melts sourced from evolved continental crust/continental lithospheric mantle. Cordilleran-margins are typically more isotopically juvenile near the trench, and conversely, increasingly evolved landward. However, this model has not been tested on the ~1,500 km long Mesozoic-Cenozoic arc of the Antarctic Peninsula. Here we show that while geochemical compositions remain largely constant, radiogenic isotopes become increasingly juvenile with time. Unlike other continental arcs, there is no association between isotopic composition and spatial distribution. This is attributed to: (i) slow subduction of young oceanic lithosphere, resulting in narrowing of the arc and reduced capacity to incorporate continental crust into melts, and (ii) the Cenozoic decrease in convergence rate, which reduced the friction in the slab-overriding plate interface, allowing the arc melts to increasingly source from young juvenile asthenosphere. |
format |
Article in Journal/Newspaper |
author |
Joaquin Bastias-Silva Alex Burton-Johnson David Chew Teal Riley Wuidad Jara Massimo Chiaradia |
author_facet |
Joaquin Bastias-Silva Alex Burton-Johnson David Chew Teal Riley Wuidad Jara Massimo Chiaradia |
author_sort |
Joaquin Bastias-Silva |
title |
A temporal control on the isotopic compositions of the Antarctic Peninsula arc |
title_short |
A temporal control on the isotopic compositions of the Antarctic Peninsula arc |
title_full |
A temporal control on the isotopic compositions of the Antarctic Peninsula arc |
title_fullStr |
A temporal control on the isotopic compositions of the Antarctic Peninsula arc |
title_full_unstemmed |
A temporal control on the isotopic compositions of the Antarctic Peninsula arc |
title_sort |
temporal control on the isotopic compositions of the antarctic peninsula arc |
publisher |
Nature Portfolio |
publishDate |
2024 |
url |
https://doi.org/10.1038/s43247-024-01301-1 https://doaj.org/article/f5789e98dc814a7c8c4cdd36ea344ba8 |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Communications Earth & Environment, Vol 5, Iss 1, Pp 1-11 (2024) |
op_relation |
https://doi.org/10.1038/s43247-024-01301-1 https://doaj.org/toc/2662-4435 doi:10.1038/s43247-024-01301-1 2662-4435 https://doaj.org/article/f5789e98dc814a7c8c4cdd36ea344ba8 |
op_doi |
https://doi.org/10.1038/s43247-024-01301-1 |
container_title |
Communications Earth & Environment |
container_volume |
5 |
container_issue |
1 |
_version_ |
1810289502776721408 |