Sources of dehydration fluids underneath the Kamchatka arc
Fluids mediate the transport of subducted slab material and play a crucial role in the generation of arc magmas. However, the source of subduction-derived fluids remains debated. The Kamchatka arc is an ideal subduction zone to identify the source of fluids because the arc magmas are comparably mafi...
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/113606 2023-09-05T13:20:43+02:00 Sources of dehydration fluids underneath the Kamchatka arc Shu, Yunchao Nielsen, Sune G. Le Roux, Veronique Wörner, Gerhard Blusztajn, Jerzy Auro, Maureen 2022 https://resolver.sub.uni-goettingen.de/purl?gro-2/113606 https://doi.org/10.1038/s41467-022-32211-5 en eng 2041-1723 Geowissenschaftliches Zentrum https://resolver.sub.uni-goettingen.de/purl?gro-2/113606 doi:10.1038/s41467-022-32211-5 32211 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 journal_article yes published_version 2022 ftsubgoettingen https://doi.org/10.1038/s41467-022-32211-5 2023-08-20T22:16:35Z Fluids mediate the transport of subducted slab material and play a crucial role in the generation of arc magmas. However, the source of subduction-derived fluids remains debated. The Kamchatka arc is an ideal subduction zone to identify the source of fluids because the arc magmas are comparably mafic, their source appears to be essentially free of subducted sediment-derived components, and subducted Hawaii-Emperor Seamount Chain (HESC) is thought to contribute a substantial fluid flux to the Kamchatka magmas. Here we show that Tl isotope ratios are unique tracers of HESC contribution to Kamchatka arc magma sources. In conjunction with trace element ratios and literature data, we trace the progressive dehydration and melting of subducted HESC across the Kamchatka arc. In succession, serpentine (<100 km depth), lawsonite (100–250 km depth) and phengite (>250 km depth) break down and produce fluids that contribute to arc magmatism at the Eastern Volcanic Front (EVF), Central Kamchatka Depression (CKD), and Sredinny Ridge (SR), respectively. However, given the Tl-poor nature of serpentine and lawsonite fluids, simultaneous melting of subducted HESC is required to explain the HESC-like Tl isotope signatures observed in EVF and CKD lavas. In the absence of eclogitic crust melting processes in this region of the Kamchatka arc, we propose that progressive dehydration and melting of a HESC-dominated mélange offers the most compelling interpretation of the combined isotope and trace element data. National Natural Science Foundation of China https://doi.org/10.13039/501100001809 National Science Foundation https://doi.org/10.13039/100000001 Article in Journal/Newspaper Kamchatka Georg-August-Universität Göttingen: GoeScholar Emperor Seamount Chain ENVELOPE(168.955,168.955,47.893,47.893) Nature Communications 13 1 |
institution |
Open Polar |
collection |
Georg-August-Universität Göttingen: GoeScholar |
op_collection_id |
ftsubgoettingen |
language |
English |
description |
Fluids mediate the transport of subducted slab material and play a crucial role in the generation of arc magmas. However, the source of subduction-derived fluids remains debated. The Kamchatka arc is an ideal subduction zone to identify the source of fluids because the arc magmas are comparably mafic, their source appears to be essentially free of subducted sediment-derived components, and subducted Hawaii-Emperor Seamount Chain (HESC) is thought to contribute a substantial fluid flux to the Kamchatka magmas. Here we show that Tl isotope ratios are unique tracers of HESC contribution to Kamchatka arc magma sources. In conjunction with trace element ratios and literature data, we trace the progressive dehydration and melting of subducted HESC across the Kamchatka arc. In succession, serpentine (<100 km depth), lawsonite (100–250 km depth) and phengite (>250 km depth) break down and produce fluids that contribute to arc magmatism at the Eastern Volcanic Front (EVF), Central Kamchatka Depression (CKD), and Sredinny Ridge (SR), respectively. However, given the Tl-poor nature of serpentine and lawsonite fluids, simultaneous melting of subducted HESC is required to explain the HESC-like Tl isotope signatures observed in EVF and CKD lavas. In the absence of eclogitic crust melting processes in this region of the Kamchatka arc, we propose that progressive dehydration and melting of a HESC-dominated mélange offers the most compelling interpretation of the combined isotope and trace element data. National Natural Science Foundation of China https://doi.org/10.13039/501100001809 National Science Foundation https://doi.org/10.13039/100000001 |
format |
Article in Journal/Newspaper |
author |
Shu, Yunchao Nielsen, Sune G. Le Roux, Veronique Wörner, Gerhard Blusztajn, Jerzy Auro, Maureen |
spellingShingle |
Shu, Yunchao Nielsen, Sune G. Le Roux, Veronique Wörner, Gerhard Blusztajn, Jerzy Auro, Maureen Sources of dehydration fluids underneath the Kamchatka arc |
author_facet |
Shu, Yunchao Nielsen, Sune G. Le Roux, Veronique Wörner, Gerhard Blusztajn, Jerzy Auro, Maureen |
author_sort |
Shu, Yunchao |
title |
Sources of dehydration fluids underneath the Kamchatka arc |
title_short |
Sources of dehydration fluids underneath the Kamchatka arc |
title_full |
Sources of dehydration fluids underneath the Kamchatka arc |
title_fullStr |
Sources of dehydration fluids underneath the Kamchatka arc |
title_full_unstemmed |
Sources of dehydration fluids underneath the Kamchatka arc |
title_sort |
sources of dehydration fluids underneath the kamchatka arc |
publishDate |
2022 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/113606 https://doi.org/10.1038/s41467-022-32211-5 |
long_lat |
ENVELOPE(168.955,168.955,47.893,47.893) |
geographic |
Emperor Seamount Chain |
geographic_facet |
Emperor Seamount Chain |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
2041-1723 Geowissenschaftliches Zentrum https://resolver.sub.uni-goettingen.de/purl?gro-2/113606 doi:10.1038/s41467-022-32211-5 32211 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1038/s41467-022-32211-5 |
container_title |
Nature Communications |
container_volume |
13 |
container_issue |
1 |
_version_ |
1776201366911320064 |