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Zinc isotopic evidence for recycled carbonate in the deep mantle

Author

Listed:
  • Xiao-Yu Zhang

    (Nanjing University)

  • Li-Hui Chen

    (Nanjing University
    Northwest University)

  • Xiao-Jun Wang

    (Northwest University)

  • Takeshi Hanyu

    (Japan Agency for Marine-Earth Science and Technology)

  • Albrecht W. Hofmann

    (Max-Planck-Institut für Chemie)

  • Tsuyoshi Komiya

    (The University of Tokyo)

  • Kentaro Nakamura

    (The University of Tokyo)

  • Yasuhiro Kato

    (The University of Tokyo)

  • Gang Zeng

    (Nanjing University)

  • Wen-Xian Gou

    (Nanjing University)

  • Wei-Qiang Li

    (Nanjing University)

Abstract

Carbonate, the major carbon reservoir on Earth’s surface, can enter into the mantle by subduction. However, evidence for recycled surficial carbonates in the deep mantle is still scarce. Ocean island basalts from Cook-Austral islands and St. Helena Island, widely called HIMU basalts because of their high μ = 238U/204Pb sources, are thought to be fed by mantle plumes originating in the lower mantle. Here we report exceptionally high δ66Zn values (δ66Zn = 0.38 ± 0.03‰) of these HIMU lavas relative to most published data for oceanic basalts (δ66Zn = 0.31 ± 0.10‰), which requires a source contributed by isotopically heavy recycled surficial carbonates. During subduction of the oceanic lithosphere, melting of mixed surficial carbonates and basaltic crust in the deep mantle generates carbonatite melts, which metasomatizes the nearby mantle and the resultant carbonated mantle ultimately evolves into a high-δ66Zn HIMU source. High-δ66Zn signatures of HIMU basalts, therefore, demonstrate that carbonates can be transported into Earth’s deep mantle.

Suggested Citation

  • Xiao-Yu Zhang & Li-Hui Chen & Xiao-Jun Wang & Takeshi Hanyu & Albrecht W. Hofmann & Tsuyoshi Komiya & Kentaro Nakamura & Yasuhiro Kato & Gang Zeng & Wen-Xian Gou & Wei-Qiang Li, 2022. "Zinc isotopic evidence for recycled carbonate in the deep mantle," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33789-6
    DOI: 10.1038/s41467-022-33789-6
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    References listed on IDEAS

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    1. Xiaohui Li & Osamu Ishizuka & Robert J. Stern & Sanzhong Li & Zhiqing Lai & Ian Somerville & Yanhui Suo & Long Chen & Hongxia Yu, 2024. "A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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