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

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

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29s..39c&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 19, pp. 39-1, CiteID 1933, DOI 10.1029/2001GL014398

Physics

7

Geochemistry: Composition Of The Mantle, Geochemistry: Trace Elements (3670), Mineralogy, Petrology, And Mineral Physics: Experimental Mineralogy And Petrology

Scientific paper

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.

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