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

Ryuichi Nomura, Haruka Ozawa, Shigehiko Tateno, Kei Hirose (), John Hernlund, Shunsuke Muto, Hirofumi Ishii and Nozomu Hiraoka
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Ryuichi Nomura: Tokyo Institute of Technology
Haruka Ozawa: Tokyo Institute of Technology
Shigehiko Tateno: Tokyo Institute of Technology
Kei Hirose: Tokyo Institute of 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

Nature, 2011, vol. 473, issue 7346, 199-202

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.

Date: 2011
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DOI: 10.1038/nature09940

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