Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures
Summary: Previous subduction thermal models are inconsistent with the values of forearc heat flow (50–140 mW/m2) and global P‒T conditions of exhumed rocks, both suggesting a shallow environment 200–300°C warmer than model predictions. Here, we revaluate these problems in Kuril-Kamchatka using 3D th...
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ftdoajarticles:oai:doaj.org/article:3240fb53c27f4f2f92bb1c4826d65abb 2023-08-20T04:07:39+02:00 Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures Weiling Zhu Yingfeng Ji Lijun Liu Rui Qu Ye Zhu Chaodi Xie Lin Ding 2023-08-01T00:00:00Z https://doi.org/10.1016/j.isci.2023.107288 https://doaj.org/article/3240fb53c27f4f2f92bb1c4826d65abb EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2589004223013652 https://doaj.org/toc/2589-0042 2589-0042 doi:10.1016/j.isci.2023.107288 https://doaj.org/article/3240fb53c27f4f2f92bb1c4826d65abb iScience, Vol 26, Iss 8, Pp 107288- (2023) Earth sciences Geology Tectonics Science Q article 2023 ftdoajarticles https://doi.org/10.1016/j.isci.2023.107288 2023-07-30T00:40:17Z Summary: Previous subduction thermal models are inconsistent with the values of forearc heat flow (50–140 mW/m2) and global P‒T conditions of exhumed rocks, both suggesting a shallow environment 200–300°C warmer than model predictions. Here, we revaluate these problems in Kuril-Kamchatka using 3D thermomechanical modeling that satisfies the observed subduction history and slab geometry, while our refined 3D slab thermal state is warmer than that predicted by previous 2D models and better matches observational constraints. We show that warmer slabs create hierarchical slab dehydration fronts at various forearc depths, causing fast and slow subduction earthquakes. We conclude that fast-to-slow subduction earthquakes all play a key role in balancing plate coupling energy release on megathrusts trenchward of high P-T volcanism. Article in Journal/Newspaper Kamchatka Directory of Open Access Journals: DOAJ Articles iScience 26 8 107288 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Earth sciences Geology Tectonics Science Q |
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Earth sciences Geology Tectonics Science Q Weiling Zhu Yingfeng Ji Lijun Liu Rui Qu Ye Zhu Chaodi Xie Lin Ding Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures |
topic_facet |
Earth sciences Geology Tectonics Science Q |
description |
Summary: Previous subduction thermal models are inconsistent with the values of forearc heat flow (50–140 mW/m2) and global P‒T conditions of exhumed rocks, both suggesting a shallow environment 200–300°C warmer than model predictions. Here, we revaluate these problems in Kuril-Kamchatka using 3D thermomechanical modeling that satisfies the observed subduction history and slab geometry, while our refined 3D slab thermal state is warmer than that predicted by previous 2D models and better matches observational constraints. We show that warmer slabs create hierarchical slab dehydration fronts at various forearc depths, causing fast and slow subduction earthquakes. We conclude that fast-to-slow subduction earthquakes all play a key role in balancing plate coupling energy release on megathrusts trenchward of high P-T volcanism. |
format |
Article in Journal/Newspaper |
author |
Weiling Zhu Yingfeng Ji Lijun Liu Rui Qu Ye Zhu Chaodi Xie Lin Ding |
author_facet |
Weiling Zhu Yingfeng Ji Lijun Liu Rui Qu Ye Zhu Chaodi Xie Lin Ding |
author_sort |
Weiling Zhu |
title |
Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures |
title_short |
Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures |
title_full |
Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures |
title_fullStr |
Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures |
title_full_unstemmed |
Reestimation of slab dehydration fronts in Kuril-Kamchatka using updated global subduction zone thermal structures |
title_sort |
reestimation of slab dehydration fronts in kuril-kamchatka using updated global subduction zone thermal structures |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.isci.2023.107288 https://doaj.org/article/3240fb53c27f4f2f92bb1c4826d65abb |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
iScience, Vol 26, Iss 8, Pp 107288- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2589004223013652 https://doaj.org/toc/2589-0042 2589-0042 doi:10.1016/j.isci.2023.107288 https://doaj.org/article/3240fb53c27f4f2f92bb1c4826d65abb |
op_doi |
https://doi.org/10.1016/j.isci.2023.107288 |
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iScience |
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26 |
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8 |
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107288 |
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1774719456829767680 |