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Spin crossover and iron-rich silicate melt in the Earth’s deep mantle

Author

Listed:
  • Ryuichi Nomura

    (Tokyo Institute of Technology
    University of Tokyo)

  • Haruka Ozawa

    (Tokyo Institute of Technology
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology)

  • Shigehiko Tateno

    (Tokyo Institute of Technology)

  • Kei Hirose

    (Tokyo Institute of Technology
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology)

  • John Hernlund

    (University of California)

  • Shunsuke Muto

    (Physics and Energy Engineering, Nagoya University)

  • Hirofumi Ishii

    (National Synchrotron Radiation Research Center)

  • Nozomu Hiraoka

    (National Synchrotron Radiation Research Center)

Abstract

Dense melt in the deep mantle The relative densities of melt and solid in the deep mantle have important implications for the chemical evolution of our planet. Recent theoretical calculations suggested that a density crossover may occur in the deepest mantle, but the important effect of the melt–solid partitioning of iron has been examined only at relatively low pressures (less than 25 gigapascals). Nomura et al. extend measurements of iron partitioning between (Mg,Fe)SiO3 perovskite and melt over the entire mantle pressure range, and find that a precipitous change occurs at about 76 GPa, resulting in stronger iron enrichment in melts at higher pressures. These results imply that liquid (Mg,Fe)SiO3 becomes more dense than coexisting solid at a depth of about 1,800 kilometres in the mantle.

Suggested Citation

  • Ryuichi Nomura & Haruka Ozawa & Shigehiko Tateno & Kei Hirose & John Hernlund & Shunsuke Muto & Hirofumi Ishii & Nozomu Hiraoka, 2011. "Spin crossover and iron-rich silicate melt in the Earth’s deep mantle," Nature, Nature, vol. 473(7346), pages 199-202, May.
    • Handle: RePEc:nat:nature:v:473:y:2011:i:7346:d:10.1038_nature09940
    DOI: 10.1038/nature09940
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