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Migration of Melt
The driving force for melt migration can be related to differences in interfacial energies, the buoyancy of melt relative to residual solids or to applied deviatoric stress. The rate of melt migration is controlled by the magnitude of the driving force, the permeability of the melt network, the viscosity of the melt, and the strength of the ...
An Experimental Study of The Effects of Surface Tension in Homogenizing Perturbations in Melt Fraction
Interfacial tension is a critical factor in determining the distribution of melt in a multiphase aggregate. Melt distribution and grain-scale pore geometry (controlled by surface energies at grain and phase boundaries) are primary controls on melt interconnectivity and permeability (e.g., Wark and Watson, 1998), which in turn control the mechanisms and rates of melt transport in the lower ...
Contrasting Viscoelastic Behavior of Melt-Free and Melt-Bearing Olivine
Melt-free and basaltic (complex alumino-silicate) melt-bearing specimens of fine-grained polycrystalline olivine (Mg 0.9 Fe 0.1) 2 SiO 4, tested at high temperature and low frequency in torsional forced oscillation and microcreep, display markedly different behavior.For the melt-bearing materials, superimposed upon the high-temperature background is a dissipation peak whose height varies ...
Experimental and Theoretical Constraints on Melt Distribution in Crustal Sources
In the case of an ideal source (i.e. a monomineralic, partially molten rock with single-valued solid-liquid and solid-solid interfacial energies, that is subject to hydrostatic stress) this equilibrium distribution is characterized by (Beere, 1975; Bulau et al., 1979; von Bargen and Waff, 1986; Hunter, 1987): (1) a constant dihedral angle O (or ...