Ferromagnesian postperovskite silicates in the D″ layer of the Earth

DOI Web Site 被引用文献10件
  • Wendy L. Mao
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Guoyin Shen
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Vitali B. Prakapenka
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Yue Meng
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Andrew J. Campbell
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Dion L. Heinz
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Jinfu Shu
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Russell J. Hemley
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
  • Ho-kwang Mao
    Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637; Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015; Consortium for Advanced Radiation Sources and James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637; and High-Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439

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説明

<jats:p>Natural olivine with 12 mol % Fe<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub>and synthetic orthopyroxenes with 20% and 40% FeSiO<jats:sub>3</jats:sub>were studied beyond the pressure–temperature conditions of the core–mantle boundary. All samples were found to convert entirely or partially into the CaIrO<jats:sub>3</jats:sub>postperovskite structure, which was recently reported for pure MgSiO<jats:sub>3</jats:sub>. The incorporation of Fe greatly reduces the pressure needed for the transition and establishes the new phase as the major component of the D″ layer. With the liquid core as an unlimited reservoir of iron, core–mantle reactions could further enrich the iron content in this phase and explain the intriguing seismic signatures observed in the D″ layer.</jats:p>

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