Fe-Mg partitioning between perovskite and ferropericlase in the lower mantle

Takeshi Sakai, Eiji Ohtani, Hidenori Terasaki, Naoki Sawada, Yusuke Kobayashi, Masaaki Miyahara, Masahiko Nishijima, Naohisa Hirao, Yasuo Ohishi, Takumi Kikegawa

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35 Citations (Scopus)

Abstract

Fe-Mg partitioning between perovskite and ferropericlase in the MgO-FeO-SiO2 system has been studied up to about 100 GPa at around 2000 K using a laser-heated diamond anvil cell (LHDAC). The compositions of both phases were determined by using analytical transmission electron microscopy (ATEM) on the recovered samples. Present results reveal that the Fe-Mg apparent partition coefficient between perovskite and ferropericlase [KD Pv/Fp = (XFePv XMFp g)/(XMPvg XFe Fp)] decreases with increasing pressure for a constant FeO of the system, and it decreases with increasing FeO content of ferropericlase. The gradual decrease of KDPv/Fp with increasing pressure is consistent with the spin transition in ferropericlase occurring in the broad pressure range from 50 to 100 GPa at around 2000 K.

Original languageEnglish
Pages (from-to)921-925
Number of pages5
JournalAmerican Mineralogist
Volume94
Issue number7
DOIs
Publication statusPublished - Jul 2009
Externally publishedYes

Keywords

  • Fe-Mg partitioning
  • Ferropericlase
  • FIB
  • LHDAC
  • Perovskite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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    Sakai, T., Ohtani, E., Terasaki, H., Sawada, N., Kobayashi, Y., Miyahara, M., Nishijima, M., Hirao, N., Ohishi, Y., & Kikegawa, T. (2009). Fe-Mg partitioning between perovskite and ferropericlase in the lower mantle. American Mineralogist, 94(7), 921-925. https://doi.org/10.2138/am.2009.3123