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Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc

Author

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  • Hong-Yan Li

    (Chinese Academy of Sciences
    CAS Center for Excellence in Deep Earth Science
    Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou))

  • Rui-Peng Zhao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jie Li

    (Chinese Academy of Sciences
    CAS Center for Excellence in Deep Earth Science)

  • Yoshihiko Tamura

    (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

  • Christopher Spencer

    (Queen’s University)

  • Robert J. Stern

    (University of Texas at Dallas)

  • Jeffrey G. Ryan

    (University of South Florida)

  • Yi-Gang Xu

    (Chinese Academy of Sciences
    CAS Center for Excellence in Deep Earth Science
    Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou))

Abstract

How serpentinites in the forearc mantle and subducted lithosphere become involved in enriching the subarc mantle source of arc magmas is controversial. Here we report molybdenum isotopes for primitive submarine lavas and serpentinites from active volcanoes and serpentinite mud volcanoes in the Mariana arc. These data, in combination with radiogenic isotopes and elemental ratios, allow development of a model whereby shallow, partially serpentinized and subducted forearc mantle transfers fluid and melt from the subducted slab into the subarc mantle. These entrained forearc mantle fragments are further metasomatized by slab fluids/melts derived from the dehydration of serpentinites in the subducted lithospheric slab. Multistage breakdown of serpentinites in the subduction channel ultimately releases fluids/melts that trigger Mariana volcanic front volcanism. Serpentinites dragged down from the forearc mantle are likely exhausted at >200 km depth, after which slab-derived serpentinites are responsible for generating slab melts.

Suggested Citation

  • Hong-Yan Li & Rui-Peng Zhao & Jie Li & Yoshihiko Tamura & Christopher Spencer & Robert J. Stern & Jeffrey G. Ryan & Yi-Gang Xu, 2021. "Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26322-8
    DOI: 10.1038/s41467-021-26322-8
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    References listed on IDEAS

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    1. 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.
    2. Chen Cai & Douglas A. Wiens & Weisen Shen & Melody Eimer, 2018. "Water input into the Mariana subduction zone estimated from ocean-bottom seismic data," Nature, Nature, vol. 563(7731), pages 389-392, November.
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    Cited by:

    1. Hong-Yan Li & Xiang Li & Jeffrey G. Ryan & Chao Zhang & Yi-Gang Xu, 2022. "Boron isotopes in boninites document rapid changes in slab inputs during subduction initiation," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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