Chemical heterogeneity in solid driven by steep temperature gradient under pressure

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Soret diffusion in olivine was investigated using laser-heated diamond anvil cell at 10-30 GPa with a steep temperature gradient. The samples were quenched to ambient condition after nominal heating duration to conduct chemical analysis of the thin section. Iron diffusion from high temperature region to low temperature one was confirmed when the temperature gradient is 50K/micron. The coefficient of Soret diffusion was roughly estimated to be 5*10-3K-1. A few minutes duration was enough to induce elemental differentiation when sample melts.