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Sources of dehydration fluids underneath the Kamchatka arc

Author

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  • Yunchao Shu

    (NIRVANA (Non-traditional Isotope Research for Various Advanced Novel Applications) Laboratories, Woods Hole Oceanographic Institution
    Okayama University, Misasa
    University of Science and Technology of China)

  • Sune G. Nielsen

    (NIRVANA (Non-traditional Isotope Research for Various Advanced Novel Applications) Laboratories, Woods Hole Oceanographic Institution
    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
    Woods Hole Oceanographic Institution)

  • Maureen Auro

    (NIRVANA (Non-traditional Isotope Research for Various Advanced Novel Applications) Laboratories, Woods Hole Oceanographic Institution)

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.

Suggested Citation

  • Yunchao Shu & Sune G. Nielsen & Veronique Roux & Gerhard Wörner & Jerzy Blusztajn & Maureen Auro, 2022. "Sources of dehydration fluids underneath the Kamchatka arc," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32211-5
    DOI: 10.1038/s41467-022-32211-5
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    References listed on IDEAS

    as
    1. Sune G. Nielsen & Mark Rehkämper & Marc D. Norman & Alex N. Halliday & Darrell Harrison, 2006. "Thallium isotopic evidence for ferromanganese sediments in the mantle source of Hawaiian basalts," Nature, Nature, vol. 439(7074), pages 314-317, January.
    2. Ronit Kessel & Max W. Schmidt & Peter Ulmer & Thomas Pettke, 2005. "Trace element signature of subduction-zone fluids, melts and supercritical liquids at 120–180 km depth," Nature, Nature, vol. 437(7059), pages 724-727, September.
    3. G. M. Yogodzinski & J. M. Lees & T. G. Churikova & F. Dorendorf & G. Wöerner & O. N. Volynets, 2001. "Geochemical evidence for the melting of subducting oceanic lithosphere at plate edges," Nature, Nature, vol. 409(6819), pages 500-504, January.
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