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FeO2 and FeOOH under deep lower-mantle conditions and Earth’s oxygen–hydrogen cycles

Author

Listed:
  • Qingyang Hu

    (Center for High Pressure Science and Technology Advanced Research (HPSTAR)
    Geophysical Laboratory, Carnegie Institution)

  • Duck Young Kim

    (Center for High Pressure Science and Technology Advanced Research (HPSTAR)
    Geophysical Laboratory, Carnegie Institution)

  • Wenge Yang

    (Center for High Pressure Science and Technology Advanced Research (HPSTAR)
    High Pressure Synergetic Consortium (HPSynC), Geophysical Laboratory, Carnegie Institution, Argonne)

  • Liuxiang Yang

    (Center for High Pressure Science and Technology Advanced Research (HPSTAR)
    High Pressure Synergetic Consortium (HPSynC), Geophysical Laboratory, Carnegie Institution, Argonne)

  • Yue Meng

    (High Pressure Collaborative Access Team (HPCAT), Geophysical Laboratory, Carnegie Institution)

  • Li Zhang

    (Center for High Pressure Science and Technology Advanced Research (HPSTAR)
    Geophysical Laboratory, Carnegie Institution)

  • Ho-Kwang Mao

    (Center for High Pressure Science and Technology Advanced Research (HPSTAR)
    Geophysical Laboratory, Carnegie Institution)

Abstract

First-principles calculations and experiments are used to identify a stable, pyrite-structured iron oxide at 76 gigapascals and 1,800 kelvin that holds an excessive amount of oxygen and to show that goethite (rust) decomposes under these deep lower-mantle conditions to form an iron oxide and release hydrogen; this process provides another way to interpret the origin of seismic and geochemical anomalies in the deep lower mantle of Earth.

Suggested Citation

  • Qingyang Hu & Duck Young Kim & Wenge Yang & Liuxiang Yang & Yue Meng & Li Zhang & Ho-Kwang Mao, 2016. "FeO2 and FeOOH under deep lower-mantle conditions and Earth’s oxygen–hydrogen cycles," Nature, Nature, vol. 534(7606), pages 241-244, June.
    • Handle: RePEc:nat:nature:v:534:y:2016:i:7606:d:10.1038_nature18018
    DOI: 10.1038/nature18018
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