The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments

B. J. Wood*, D. C. Rubie

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    166 Citations (Scopus)

    Abstract

    Experimental data on the partitioning of Fe and Mg between coexisting silicate perovskite, magnesiowustite, and γ-(Mg,Fe)2SiO4 demonstrate that Fe substitution in perovskite is strongly coupled to Al2O3 concentration. In Al2O3-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 Al2O3, 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.

    Original languageEnglish
    Pages (from-to)1522-1524
    Number of pages3
    JournalScience
    Volume273
    Issue number5281
    Publication statusPublished - 1996

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