Sources of dehydration fluids underneath the Kamchatka arc

Yunchao Shu (), Sune G. Nielsen (), Veronique Roux, Gerhard Wörner, Jerzy Blusztajn and Maureen Auro
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Yunchao Shu: NIRVANA (Non-traditional Isotope Research for Various Advanced Novel Applications) Laboratories, Woods Hole Oceanographic Institution
Sune G. Nielsen: NIRVANA (Non-traditional Isotope Research for Various Advanced Novel Applications) Laboratories, Woods Hole Oceanographic Institution
Veronique Roux: Woods Hole Oceanographic Institution
Gerhard Wörner: Geowissenschaftliches Zentrum der Universitӓt Gӧttingen
Jerzy Blusztajn: NIRVANA (Non-traditional Isotope Research for Various Advanced Novel Applications) Laboratories, Woods Hole Oceanographic Institution
Maureen Auro: NIRVANA (Non-traditional Isotope Research for Various Advanced Novel Applications) Laboratories, Woods Hole Oceanographic Institution

Nature Communications, 2022, vol. 13, issue 1, 1-14

Abstract: Abstract 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 ( 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.

Date: 2022
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DOI: 10.1038/s41467-022-32211-5

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