Antarctic Peninsula and South Shetland Islands: petrology
The Antarctic Peninsula contains a record of continental margin volcanism extending from Jurassic to Recent times. Subduction of the Pacific oceanic lithosphere beneath the continental margin developed after Late Jurassic volcanism in Alexander Island that was related to extension of the continental...
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ftdatacite:10.6084/m9.figshare.c.5192644.v3 2023-05-15T13:15:16+02:00 Antarctic Peninsula and South Shetland Islands: petrology Leat, Philip T. Teal R. Riley 2021 https://dx.doi.org/10.6084/m9.figshare.c.5192644.v3 https://geolsoc.figshare.com/collections/Antarctic_Peninsula_and_South_Shetland_Islands_II_Petrology/5192644/3 unknown Geological Society of London https://dx.doi.org/10.1144/m55-2018-68 https://dx.doi.org/10.6084/m9.figshare.c.5192644 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2021 ftdatacite https://doi.org/10.6084/m9.figshare.c.5192644.v3 https://doi.org/10.1144/m55-2018-68 https://doi.org/10.6084/m9.figshare.c.5192644 2021-11-05T12:55:41Z The Antarctic Peninsula contains a record of continental margin volcanism extending from Jurassic to Recent times. Subduction of the Pacific oceanic lithosphere beneath the continental margin developed after Late Jurassic volcanism in Alexander Island that was related to extension of the continental margin. Mesozoic ocean floor basalts emplaced within the Alexander Island accretionary complex have compositions derived from Pacific mantle. The Antarctic Peninsula volcanic arc was active from about Early Cretaceous times until the Early Miocene. It was affected by hydrothermal alteration and regional and contact metamorphism generally of zeolite to prehnite-pumpellyite facies. Distinct geochemical groups recognized within the volcanic rocks suggest varied magma generation processes related to changes in subduction dynamics. The four groups are: calc-alkaline, high-Mg andesitic, adakitic and high-Zr, the last two being described in this arc for the first time. The dominant calc-alkaline group ranges from primitive mafic magmas to rhyolite and from low- to high-K in composition and was generated from mantle wedge with variable depletion. The high-Mg and adakitic rocks indicate periods of melting of the subducting slab and variable equilibration of the melts with mantle. The high-Zr group is interpreted as peralkaline and may have been related to extension of the arc. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula South Shetland Islands DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Pacific Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
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topic |
Geology FOS Earth and related environmental sciences |
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Geology FOS Earth and related environmental sciences Leat, Philip T. Teal R. Riley Antarctic Peninsula and South Shetland Islands: petrology |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The Antarctic Peninsula contains a record of continental margin volcanism extending from Jurassic to Recent times. Subduction of the Pacific oceanic lithosphere beneath the continental margin developed after Late Jurassic volcanism in Alexander Island that was related to extension of the continental margin. Mesozoic ocean floor basalts emplaced within the Alexander Island accretionary complex have compositions derived from Pacific mantle. The Antarctic Peninsula volcanic arc was active from about Early Cretaceous times until the Early Miocene. It was affected by hydrothermal alteration and regional and contact metamorphism generally of zeolite to prehnite-pumpellyite facies. Distinct geochemical groups recognized within the volcanic rocks suggest varied magma generation processes related to changes in subduction dynamics. The four groups are: calc-alkaline, high-Mg andesitic, adakitic and high-Zr, the last two being described in this arc for the first time. The dominant calc-alkaline group ranges from primitive mafic magmas to rhyolite and from low- to high-K in composition and was generated from mantle wedge with variable depletion. The high-Mg and adakitic rocks indicate periods of melting of the subducting slab and variable equilibration of the melts with mantle. The high-Zr group is interpreted as peralkaline and may have been related to extension of the arc. |
format |
Article in Journal/Newspaper |
author |
Leat, Philip T. Teal R. Riley |
author_facet |
Leat, Philip T. Teal R. Riley |
author_sort |
Leat, Philip T. |
title |
Antarctic Peninsula and South Shetland Islands: petrology |
title_short |
Antarctic Peninsula and South Shetland Islands: petrology |
title_full |
Antarctic Peninsula and South Shetland Islands: petrology |
title_fullStr |
Antarctic Peninsula and South Shetland Islands: petrology |
title_full_unstemmed |
Antarctic Peninsula and South Shetland Islands: petrology |
title_sort |
antarctic peninsula and south shetland islands: petrology |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5192644.v3 https://geolsoc.figshare.com/collections/Antarctic_Peninsula_and_South_Shetland_Islands_II_Petrology/5192644/3 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) |
geographic |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Pacific Alexander Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Pacific Alexander Island |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula South Shetland Islands |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula South Shetland Islands |
op_relation |
https://dx.doi.org/10.1144/m55-2018-68 https://dx.doi.org/10.6084/m9.figshare.c.5192644 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5192644.v3 https://doi.org/10.1144/m55-2018-68 https://doi.org/10.6084/m9.figshare.c.5192644 |
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1766267845548703744 |