CaSiO3 and CaTiO3 perovskite-melt partitioning of trace elements: Implications for gross mantle differentation

Alexandre Corgne*, Bernard J. Wood

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    48 Citations (Scopus)

    Abstract

    We report the results of CaSiO3 perovskite-melt partitioning experiments conducted at conditions relevant to the uppermost lower mantle. Partition coefficients, measured by LA-ICPMS, show that CaSiO3 perovskite has a strong affinity for REE, Y, Th and U, making CaSiO3 the most likely host for these elements in the lower mantle. Comparison with the low-pressure analogue CaTiO3 shows that large ions partition similarly into the Ca-sites of the two perovskites. Thus CaTiO3 may be used as a model to investigate the factors controlling the partitioning of many trace ions into CaSiO3. Combined fractionation of MgSiO3 and CaSiO3 perovskites during an early magma ocean has been suggested as a means of enriching the lower mantle in silica. Our results show, however, that the chondritic upper mantle ratios of refractory lithophile elements would be lost after ∼ 17% of perovskite fractionation. A large perovskitic layer 'hidden' in the lower mantle is therefore improbable.

    Original languageEnglish
    Pages (from-to)39-31
    Number of pages9
    JournalGeophysical Research Letters
    Volume29
    Issue number19
    Publication statusPublished - 1 Oct 2002

    Fingerprint Dive into the research topics of 'CaSiO<sub>3</sub> and CaTiO<sub>3</sub> perovskite-melt partitioning of trace elements: Implications for gross mantle differentation'. Together they form a unique fingerprint.

    Cite this