The physical properties of partially molten rocks are directly coupled to the grain-scale as well as the broader scale distribution of the melt phase. At the grain scale, if melt forms isolated pockets in a silicate matrix, its influence on plastic flow is generally relatively minor. In contrast, if the melt wets all of the grain-grain interfaces, it may dramatically lower the viscosity of the rock. At the broader scale, deformation will localize to form shear zones in melt-rich regions that commonly develop in partially molten rocks. In turn, the melt distribution evolves during plastic deformation of a partially molten...

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