TY - JOUR
T1 - Fe-Mg partitioning between post-perovskite and ferropericlase in the lowermost mantle
AU - Sakai, Takeshi
AU - Ohtani, Eiji
AU - Terasaki, Hidenori
AU - Miyahara, Masaaki
AU - Nishijima, Masahiko
AU - Hirao, Naohisa
AU - Ohishi, Yasuo
AU - Sata, Nagayoshi
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Young Scientists (Start-up) to T. S. (no. 19840007) and by a Grant-in-Aid for Scientific Researches to E. O. (No. 18104009) from the Ministry of Education, Culture, Sports, Science and Technology of the Japanese Government, and was conducted as a part of the Global Center-of-Excellence program “Global Education and Research Center for Earth and Planetary Dynamics”. This work was partly supported by the Nanotechnology Support Project of the Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
KW - Core-mantle boundary
KW - Ferropericlase
KW - Laser-heated diamond anvil cell
KW - Partition coefficient
KW - Post-perovskite
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U2 - 10.1007/s00269-009-0349-4
DO - 10.1007/s00269-009-0349-4
M3 - Article
AN - SCOPUS:77954217969
SN - 0342-1791
VL - 37
SP - 487
EP - 496
JO - Physics and Chemistry of Minerals
JF - Physics and Chemistry of Minerals
IS - 7
ER -