Abstract
We present an extended formulation for the interfacial tension driven melt migration by taking into account dissolution/precipitation and diffusive matter transport through the liquid phase. Our results indicate that the melt migration is caused by two mechanisms. In the first mechanism, a change in melt fraction is accommodated by compaction/decompaction of solid matrix, and in the second mechanism, a change in melt fraction is accommodated by dissolution/precipitation. The latter mechanism is newly introduced in this study. As spatial scale decreases, the dominant mechanism changes from compaction/decompaction to dissolution/precipitation, and when the second mechanism is dominant, evolution of melt fraction is governed by a nonlinear diffusion equation. Therefore, critical scale of this transition is called “diffusion length δ d” below which melt fraction evolves primarily by diffusion. Diffusion length δ d is usually smaller than the compaction length δ c. Important roles of the new mechanism are discussed on the basis of existing experimental data on melt infiltration, shear-induced melt segregation into melt-rich bands, and rehomogenization of melt in the bands due to static annealing. Melt distribution in the mantle is briefly discussed on the basis of the new model.
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