On the importance of viscous anisotropy in shear-induced melt segregation and organization

摘要: Mechanical and transport properties of solid-liquid two-phase systems strongly depend on the detailed geometry liquid phase. In 1980s-90s, microscopic melt in partially molten rocks that are texturally equilibrated under hydrostatic stress was assessed experimentally; based results these studies, viscosity, seismic wave velocity, permeability mantle were predicted quantitatively. Concurrently, geochemical studies concluding compositions indicate small degrees (implying fractions about 1%). However, such could not explain large reductions shear velocity viscosity asthenosphere obtained from seismological geodynamical studies. Nor it rapid ascent indicated significant radioactive disequilibrium basalts.