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Science 19 December 1997:
Vol. 278. no. 5346, pp. 2098 - 2100
DOI: 10.1126/science.278.5346.2098
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Reports

Multivariable Dependence of Fe-Mg Partitioning in the Lower Mantle

Ho-kwang Mao, * Guoyin Shen, dagger Russell J. Hemley

High-pressure diamond-cell experiments indicate that the iron-magnesium partitioning between (Fe,Mg)SiO3-perovskite and magnesiowüstite 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.

Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015-1305 USA.
*   To whom correspondence should be addressed.

dagger    Present address: Consortium for Advanced Radiation Sources, University of Chicago, Chicago, IL 60637 USA.

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