Journal
AMERICAN MINERALOGIST
Volume 94, Issue 7, Pages 921-925Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2009.3123
Keywords
Perovskite; ferropericlase; Fe-Mg partitioning; LHDAC; FIB
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- [16075202]
- [18104009]
- [19840007]
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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) = ((XFeXMgFp)-X-Pv)/((XMgXFeFp)-X-Pv)] 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.
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