Report

Multivariable Dependence of Fe-Mg Partitioning in the Lower Mantle

+ See all authors and affiliations

Science  19 Dec 1997:
Vol. 278, Issue 5346, pp. 2098-2100
DOI: 10.1126/science.278.5346.2098

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


Abstract

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.

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

View Full Text

Related Content