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- W2002131502 abstract "Cr3+ ions have a strong preference for octahedral sites in mineral structures and discriminate against tetrahedral sites, whereas Cr2+ ions favor distorted environments, according to crystal field theory. All structure-types proposed for the transition zone and lower mantle contain six-coordinated sites, so that Cr3+ ions may be distributed over several phases in the Earth's interior. In the upper mantle, however, stabilization energies derived from crystal field spectra suggest that the enrichment of Cr3+ follows the sequence: spinel > garnet > pyroxene or olivine. High-spin Cr2+ ions, which may occur at very high pressures and low oxygen fugacities, are predicted to be stabilized in deformed sites of the olivine and Sr2PbO4 structure-types. Low-spin Cr2+ ions may also occur in the CaFe2O4 structure-type in the lower mantle. It is proposed that some chromite inclusions in forsterites from the upper mantle are formed by pressure-released oxidation of Cr2+ ions originally present in olivine or spinel modifications of Mg2SiO4." @default.
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- W2002131502 title "Crystal field effects in chromium and its partitioning in the mantle" @default.
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- W2002131502 doi "https://doi.org/10.1016/0016-7037(75)90031-9" @default.
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