Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b)
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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ftnerc:oai:nora.nerc.ac.uk:530067 2023-05-15T13:15:16+02:00 Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b) Leat, Philip T. Riley, Teal R. Smellie, J.L. Panter, K.S. Geyer, A. 2021-06-09 http://nora.nerc.ac.uk/id/eprint/530067/ https://mem.lyellcollection.org/content/55/1/213 unknown Geological Society of London Leat, Philip T.; Riley, Teal R. orcid:0000-0002-3333-5021 . 2021 Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b). In: Smellie, J.L.; Panter, K.S.; Geyer, A., (eds.) Volcanism in Antarctica: 200 million years of subduction, rifting and continental break-up. London, Geological Society of London, 213-226. (Geological Society Memoir, M55). Publication - Book Section PeerReviewed 2021 ftnerc 2023-02-04T19:51:57Z 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 by 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 a 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. Book Part Alexander Island Antarc* Antarctic Antarctic Peninsula South Shetland Islands Natural Environment Research Council: NERC Open Research Archive Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Antarctic Antarctic Peninsula Pacific South Shetland Islands The Antarctic |
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Natural Environment Research Council: NERC Open Research Archive |
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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 by 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 a 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. |
author2 |
Smellie, J.L. Panter, K.S. Geyer, A. |
format |
Book Part |
author |
Leat, Philip T. Riley, Teal R. |
spellingShingle |
Leat, Philip T. Riley, Teal R. Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b) |
author_facet |
Leat, Philip T. Riley, Teal R. |
author_sort |
Leat, Philip T. |
title |
Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b) |
title_short |
Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b) |
title_full |
Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b) |
title_fullStr |
Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b) |
title_full_unstemmed |
Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b) |
title_sort |
antarctic peninsula and south shetland islands: petrology (chapter 3.1b) |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/530067/ https://mem.lyellcollection.org/content/55/1/213 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) |
geographic |
Alexander Island Antarctic Antarctic Peninsula Pacific South Shetland Islands The Antarctic |
geographic_facet |
Alexander Island Antarctic Antarctic Peninsula Pacific South Shetland Islands The Antarctic |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula South Shetland Islands |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula South Shetland Islands |
op_relation |
Leat, Philip T.; Riley, Teal R. orcid:0000-0002-3333-5021 . 2021 Antarctic Peninsula and South Shetland Islands: Petrology (Chapter 3.1b). In: Smellie, J.L.; Panter, K.S.; Geyer, A., (eds.) Volcanism in Antarctica: 200 million years of subduction, rifting and continental break-up. London, Geological Society of London, 213-226. (Geological Society Memoir, M55). |
_version_ |
1766267837421191168 |