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

doi:10.2138/am.2009.3123

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

Research output: Contribution to journal › Article › peer-review

41 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 [K_D ^Pv/Fp = (X_Fe^Pv X_M^Fp _g)/(X_M^Pv_g X_Fe ^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 K_D^Pv/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 language	English
Pages (from-to)	921-925
Number of pages	5
Journal	American Mineralogist
Volume	94
Issue number	7
DOIs	https://doi.org/10.2138/am.2009.3123
Publication status	Published - Jul 2009
Externally published	Yes

Keywords

FIB
Fe-Mg partitioning
Ferropericlase
LHDAC
Perovskite

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

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10.2138/am.2009.3123

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title = "Fe-Mg partitioning between perovskite and ferropericlase in the lower mantle",

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.",

keywords = "FIB, Fe-Mg partitioning, Ferropericlase, LHDAC, Perovskite",

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

year = "2009",

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AU - Sakai, Takeshi

AU - Ohtani, Eiji

AU - Terasaki, Hidenori

AU - Sawada, Naoki

AU - Kobayashi, Yusuke

AU - Miyahara, Masaaki

AU - Nishijima, Masahiko

AU - Hirao, Naohisa

AU - Ohishi, Yasuo

AU - Kikegawa, Takumi

PY - 2009/7

Y1 - 2009/7

N2 - 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.

AB - 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.

KW - FIB

KW - Fe-Mg partitioning

KW - Ferropericlase

KW - LHDAC

KW - Perovskite

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

Abstract

Keywords

ASJC Scopus subject areas

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