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  • Title: Fe-Mg interdiffusion in (Mg,Fe)SiO3 Perovskite and lower mantle reequilibration.
    Author: Holzapfel C, Rubie DC, Frost DJ, Langenhorst F.
    Journal: Science; 2005 Sep 09; 309(5741):1707-10. PubMed ID: 16051751.
    Abstract:
    Fe-Mg interdiffusion coefficients for (Mg,Fe)SiO3 perovskite have been measured at pressures of 22 to 26 gigapascals and temperatures between 1973 and 2273 kelvin. Perovskite Fe-Mg interdiffusion is as slow as Si self-diffusion and is orders of magnitude slower than Fe-Mg diffusion in other mantle minerals. Length scales over which chemical heterogeneities can homogenize, throughout the depth range of the lower mantle, are limited to a few meters even on time scales equivalent to the age of Earth. Heterogeneities can therefore only equilibrate chemically when they are stretched and thinned by intense deformation.
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