Mg-perovskite/silicate melt and majorite garnet/silicate melt partition coefficients in the system CaO - MgO - SiO2 at high temperatures and pressures

Details Mg-perovskite/silicate melt and majorite garnet/silicate melt partition coefficients in the system CaO - MgO - SiO2 at high temperatures and pressures Mg-perovskite/silicate melt and majorite garnet/silicate melt partition coefficients in the system CaO - MgO - SiO2 at high temperatures and pressures

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5427d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E3, p. 5427-5431.

Physics

21

Earth Mantle, Garnets, Geochemistry, Magma, Perovskites, Planetary Evolution, Silicates, Calcium Oxides, High Pressure, High Temperature, Magnesium Oxides, Melts (Crystal Growth), Silicon Dioxide

Scientific paper

We report the results of a Mg-perovskite/ silicate melt and a majorite garnet/silicate melt elemental partitioning experiment conducted at high pressures and temperatures in the synthetic system CaO - MgO - SiO2. Partition coefficients for some refractory lithophile elements (e.g., Sc, Sm) deviate significantly from unity. If Mg-perovskite segregated from a terrestrial magma ocean, it would impart nonchondritic refractory lithophile element ratios such as Sc/Sm to the primitive upper mantle of Earth, contrary to inference based on analyses of naturally occurring samples. Either Earth was never substantially molten at the end of accretion, or segregation of minerals from magmas was suppressed by vigorous convection. It is difficult to avoid melting Earth during accretion so the latter alternative seems more plausible.

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