Computer Science
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...273.1522w&link_type=abstract
Science, Volume 273, Issue 5281, pp. 1522-1524
Computer Science
74
Scientific paper
Experimental data on the partitioning of Fe and Mg between coexisting silicate perovskite, magnesiowustite, and γ-(Mg,Fe)_2SiO_4 demonstrate that Fe substitution in perovskite is strongly coupled to Al_2O_3 concentration. In Al_2O_3-free compositions, perovskite has a low Fe/(Fe+Mg) ratio: for a bulk Fe/(Fe+Mg) of 0.11, perovskite has a value close to 0.04, whereas magnesiowustite has a ratio near 0.17. In peridotitic mantle, however, where the perovskite should contain 4 to 5 weight percent Al_2O_3, it has essentially the same Fe/(Fe+Mg) ratio as coexisting magnesiowustite. Under lower mantle conditions, therefore, perovskite and magnesiowustite should, in peridotite, each have an Fe/(Fe+Mg) ratio close to 0.11.
Rubie David C.
Wood Bernard J.
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