Many silicate melts of geological interests are made of three or more oxide components (e.g., SiO2, Al2O3, TiO2, FeO, MgO, CaO, Na2O, K2O, and H2O). Chemical diffusion in such systems is referred as multicomponent diffusion. Multicomponent diffusion involves mass fluxes driven by chemical potential gradients and is an essential mass transfer mechanism for many transport processes involving melt, solid, and melt-solid mixtures under magmatic conditions. The rate of crystal dissolution in a melt, for example, is determined by the rate of diffusion in the liquid, the...

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