AI Article Synopsis
- Fe-Mg interdiffusion coefficients for (Mg,Fe)SiO3 perovskite were studied at high pressures (22-26 GPa) and temperatures (1973-2273 K).
- The interdiffusion of Fe and Mg in perovskite is notably slow, comparable to the much slower Si self-diffusion, and significantly slower than diffusion in other mantle minerals.
- As a result, chemical heterogeneities in the lower mantle can only homogenize over a few meters, and equilibration occurs primarily through intense deformation processes.
Article 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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| http://dx.doi.org/10.1126/science.1111895 | DOI Listing |
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Article Synopsis
- Fe-Mg interdiffusion coefficients for (Mg,Fe)SiO3 perovskite were studied at high pressures (22-26 GPa) and temperatures (1973-2273 K).
- The interdiffusion of Fe and Mg in perovskite is notably slow, comparable to the much slower Si self-diffusion, and significantly slower than diffusion in other mantle minerals.
- As a result, chemical heterogeneities in the lower mantle can only homogenize over a few meters, and equilibration occurs primarily through intense deformation processes.
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