Spin transition, substitution, and partitioning of iron in lower mantle minerals

Kiyoshi Fujino, Daisuke Nishio-Hamane, Takaya Nagai, Yusuke Seto, Yasuhiro Kuwayama, Matthew Whitaker, Hiroaki Ohfuji, Toru Shinmei, Tetsuo Irifune

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Spin transition and substitution of Fe3+ in Fe3+AlO3-bearing MgSiO3 perovskite (Pv) and post-perovskite (PPv) were examined up to 200 and 165GPa, respectively, at room temperature by X-ray emission spectroscopy (XES) and XRD. The results of XES and XRD indicate that in Pv high spin (HS) Fe3+ at the dodecahedral (A) site replaces Al at the octahedral (B) site and becomes low spin (LS) between 50 and 70GPa with pressure, while in PPv LS Fe3+ occupies the B-site and Al occupies the A-site above 80-100GPa. The Fe3+-Al coupled substitution seems to be at work in both Pv and PPv. Combining these results on Fe3+ with the recent first-principles calculations on Fe2+ in Pv and PPv, the spin transition and substitution of iron in pyrolitic lower mantle minerals are proposed. Further, their effects on iron-partitioning among the lower mantle minerals are discussed.

Original languageEnglish
Pages (from-to)186-191
Number of pages6
JournalPhysics of the Earth and Planetary Interiors
Volume228
DOIs
Publication statusPublished - 2014 Mar
Externally publishedYes

Keywords

  • Iron-partitioning
  • Lower mantle
  • Mg-perovskite
  • Post-Mg-perovskite
  • Spin transition of iron

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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