Abstract
Pressure effect on the cation distribution in olivine (Mg, Fe) 2SiO4 was detected through heating and quenching experiments under high pressures, combined with single crystal X-ray structure refinements under atmospheric pressure. The distribution coefficient KD [= (Fe/Mg) M1/ (Fe/Mg) M2] in the mantle olivine increases with depth by the effects of both pressure and temperature. The KD at the depth of 400 km is evaluated to be larger than 2.2, in contrast to 0.9-1.2 of natural samples available at the surface of the Earth.
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