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Licensed Unlicensed Requires Authentication Published by De Gruyter April 1, 2015

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

  • Takeshi Sakai EMAIL logo , Eiji Ohtani , Hidenori Terasaki , Naoki Sawada , Yusuke Kobayashi , Masaaki Miyahara , Masahiko Nishijima , Naohisa Hirao , Yasuo Ohishi and Takumi Kikegawa
From the journal American Mineralogist

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 [KDPv/Fp = (XFePv XMgFp)/(XMgPv XFeFp)] 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.

Received: 2008-10-20
Accepted: 2009-3-3
Published Online: 2015-4-1
Published in Print: 2009-7-1

© 2015 by Walter de Gruyter Berlin/Boston

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