Fe-Mg partitioning between post-perovskite and ferropericlase in the lowermost mantle

Takeshi Sakai, Eiji Otani, Hidenori Terasaki, Masaaki Miyahara, Masahiko Nishijima, Naohisa Hirao, Yasuo Ohishi, Nagayoshi Sata

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Fe-Mg partitioning between post-perovskite and ferropericlase has been studied using a laser-heated diamond anvil cell at pressures up to 154 GPa and 2,010 K which corresponds to the conditions in the lowermost mantle. The composition of the phases in the recovered samples was determined using analytical transmission electron microscopy. Our results reveal that the Fe-Mg partition coefficient between post-perovskite and ferropericlase (KDPPv/Fp increases with decreasing bulk iron content. The compositional dependence of KDPPv/Fp on the bulk iron content explains the inconsistency in previous studies, and the effect of the bulk iron content is the most dominant factor compared to other factors, such as temperature and aluminum content. Iron prefers ferropericlase compared to post-perovskite over a wide compositional range, whereas the iron content of post-perovskite (XFePPv, the mole fraction) does not exceed a value of 0.10. The iron-rich ferropericlase phase may have significant influence on the physical properties, such as the seismic velocity and electrical conductivity at the core-mantle boundary region.

Original languageEnglish
Pages (from-to)487-496
Number of pages10
JournalPhysics and Chemistry of Minerals
Volume37
Issue number7
DOIs
Publication statusPublished - 2010 Jan 1

Keywords

  • Core-mantle boundary
  • Ferropericlase
  • Laser-heated diamond anvil cell
  • Partition coefficient
  • Post-perovskite

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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