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Experimental evidence for hydrogen incorporation into Earth’s core

Author

Listed:
  • Shoh Tagawa

    (The University of Tokyo)

  • Naoya Sakamoto

    (Hokkaido University)

  • Kei Hirose

    (The University of Tokyo
    Earth-Life Science Institute, Tokyo Institute of Technology)

  • Shunpei Yokoo

    (The University of Tokyo)

  • John Hernlund

    (Earth-Life Science Institute, Tokyo Institute of Technology)

  • Yasuo Ohishi

    (Japan Synchrotron Radiation Research Institute)

  • Hisayoshi Yurimoto

    (Hokkaido University
    Hokkaido University)

Abstract

Hydrogen is one of the possible alloying elements in the Earth’s core, but its siderophile (iron-loving) nature is debated. Here we experimentally examined the partitioning of hydrogen between molten iron and silicate melt at 30–60 gigapascals and 3100–4600 kelvin. We find that hydrogen has a metal/silicate partition coefficient DH ≥ 29 and is therefore strongly siderophile at conditions of core formation. Unless water was delivered only in the final stage of accretion, core formation scenarios suggest that 0.3–0.6 wt% H was incorporated into the core, leaving a relatively small residual H2O concentration in silicates. This amount of H explains 30–60% of the density deficit and sound velocity excess of the outer core relative to pure iron. Our results also suggest that hydrogen may be an important constituent in the metallic cores of any terrestrial planet or moon having a mass in excess of ~10% of the Earth.

Suggested Citation

  • Shoh Tagawa & Naoya Sakamoto & Kei Hirose & Shunpei Yokoo & John Hernlund & Yasuo Ohishi & Hisayoshi Yurimoto, 2021. "Experimental evidence for hydrogen incorporation into Earth’s core," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22035-0
    DOI: 10.1038/s41467-021-22035-0
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    Cited by:

    1. Katsutoshi Kawano & Masayuki Nishi & Hideharu Kuwahara & Sho Kakizawa & Toru Inoue & Tadashi Kondo, 2024. "Extensive iron–water exchange at Earth’s core–mantle boundary can explain seismic anomalies," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Lanlan Shi & Wenhua Lu & Takanori Kagoshima & Yuji Sano & Zenghao Gao & Zhixue Du & Yun Liu & Yingwei Fei & Yuan Li, 2022. "Nitrogen isotope evidence for Earth’s heterogeneous accretion of volatiles," Nature Communications, Nature, vol. 13(1), pages 1-15, December.

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