The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction
Abstract The Oligocene to Present Wrangell Volcanic Belt ( WVB ) extends for ~500 km across south‐central Alaska (USA) into Canada at a volcanic arc‐transform junction. Previously, geochemistry documented mantle wedge and slab‐edge melting in <12 Ma WVB volcanic rocks; new geochemistry shows that...
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crwiley:10.1111/ter.12369 2024-06-23T07:57:25+00:00 The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction Brueseke, Matthew E. Benowitz, Jeffrey A. Trop, Jeffrey M. Davis, Kailyn N. Berkelhammer, Samuel E. Layer, Paul W. Morter, Bethany K. Division of Earth Sciences National Science Foundation 2019 http://dx.doi.org/10.1111/ter.12369 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ter.12369 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ter.12369 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/ter.12369 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 31, issue 1, page 59-66 ISSN 0954-4879 1365-3121 journal-article 2019 crwiley https://doi.org/10.1111/ter.12369 2024-06-06T04:24:46Z Abstract The Oligocene to Present Wrangell Volcanic Belt ( WVB ) extends for ~500 km across south‐central Alaska (USA) into Canada at a volcanic arc‐transform junction. Previously, geochemistry documented mantle wedge and slab‐edge melting in <12 Ma WVB volcanic rocks; new geochemistry shows that the same processes characterized ~18–30 Ma WVB magmatism in Alaska. New 40 Ar/ 39 Ar ages demonstrate that WVB magmatism in Alaska initiated at ~30 Ma due to flat‐slab subduction of the Yakutat microplate and that the dextral Totschunda fault was active at this time. Our results, together with prior studies, show that Alaskan WVB magmatism occurred chiefly due to subduction and should be considered a volcanic arc (e.g. the Wrangell Arc). The WVB provides a long‐term geological record of subduction, strike‐slip and magmatism. Slab‐edge upwelling, flat‐slab defocused fluid‐flux and faults acting as magma conduits are likely responsible for the exceptionally large volcanoes and high eruption rates of the Wrangell Arc. Article in Journal/Newspaper Yakutat Alaska Wiley Online Library Canada Terra Nova 31 1 59 66 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The Oligocene to Present Wrangell Volcanic Belt ( WVB ) extends for ~500 km across south‐central Alaska (USA) into Canada at a volcanic arc‐transform junction. Previously, geochemistry documented mantle wedge and slab‐edge melting in <12 Ma WVB volcanic rocks; new geochemistry shows that the same processes characterized ~18–30 Ma WVB magmatism in Alaska. New 40 Ar/ 39 Ar ages demonstrate that WVB magmatism in Alaska initiated at ~30 Ma due to flat‐slab subduction of the Yakutat microplate and that the dextral Totschunda fault was active at this time. Our results, together with prior studies, show that Alaskan WVB magmatism occurred chiefly due to subduction and should be considered a volcanic arc (e.g. the Wrangell Arc). The WVB provides a long‐term geological record of subduction, strike‐slip and magmatism. Slab‐edge upwelling, flat‐slab defocused fluid‐flux and faults acting as magma conduits are likely responsible for the exceptionally large volcanoes and high eruption rates of the Wrangell Arc. |
author2 |
Division of Earth Sciences National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Brueseke, Matthew E. Benowitz, Jeffrey A. Trop, Jeffrey M. Davis, Kailyn N. Berkelhammer, Samuel E. Layer, Paul W. Morter, Bethany K. |
spellingShingle |
Brueseke, Matthew E. Benowitz, Jeffrey A. Trop, Jeffrey M. Davis, Kailyn N. Berkelhammer, Samuel E. Layer, Paul W. Morter, Bethany K. The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction |
author_facet |
Brueseke, Matthew E. Benowitz, Jeffrey A. Trop, Jeffrey M. Davis, Kailyn N. Berkelhammer, Samuel E. Layer, Paul W. Morter, Bethany K. |
author_sort |
Brueseke, Matthew E. |
title |
The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction |
title_short |
The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction |
title_full |
The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction |
title_fullStr |
The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction |
title_full_unstemmed |
The Alaska Wrangell Arc: ~30 Ma of subduction‐related magmatism along a still active arc‐transform junction |
title_sort |
alaska wrangell arc: ~30 ma of subduction‐related magmatism along a still active arc‐transform junction |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/ter.12369 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ter.12369 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ter.12369 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/ter.12369 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_source |
Terra Nova volume 31, issue 1, page 59-66 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/ter.12369 |
container_title |
Terra Nova |
container_volume |
31 |
container_issue |
1 |
container_start_page |
59 |
op_container_end_page |
66 |
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1802651054413709312 |