Multivariable dependence of Fe-Mg partitioning in the lower mantle

被引:116
作者
Mao, HK
Shen, GY
Hemley, RJ
机构
[1] Geophysical Laboratory, Center for High Pressure Research, Carnegie Institution of Washington, Washington, DC 20015-1305, 5251 Broad Branch Road, NW
[2] Consortium for Adv. Radiat. Sources, University of Chicago, Chicago
关键词
D O I
10.1126/science.278.5346.2098
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
High-pressure diamond-cell experiments indicate that the iron-magnesium partitioning between (Fe,Mg)SiO3-perovskite and magnesiowustite in Earth's lower mantle depends on the pressure, temperature, bulk iron/magnesium ratio, and ferric iron content, The perovskite stability field expands with increasing pressure and temperature. The ferric iron component preferentially dissolves in perovskite and raises the apparent total iron content but had little effect on the partitioning of the ferrous iron, The ferrous iron depletes in perovskite at the top of the lower mantle and gradually increases at greater depth. These changes in iron-magnesium composition should affect geochemical and geophysical properties of the deep interior.
引用
收藏
页码:2098 / 2100
页数:3
相关论文
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