On the role of surface tension in the migration of melts and fluids

Details On the role of surface tension in the migration of melts and fluids On the role of surface tension in the migration of melts and fluids

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1149s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Nov. 1986, p. 1149-1152.

Physics

Fluid Dynamics

39

Fluid Dynamics, Geophysical Fluids, Interfacial Tension, Magma, Diffusion, Earth Crust, Earth Mantle, Gravitational Effects

Scientific paper

It is shown that surface tension can cause redistribution of melt in a partially molten medium, in accordance with a nonlinear diffusion equation for the melt fraction. The associated diffusivity D depends on the surface energy and is positive (stable) for dihedral angle less than 60 deg and negative (unstable) for dihedral angle greater than 60 deg. In the more likely stable case, D of about 10 to the -7th sq cm/s is typical for mantle melts, but a value as high as 0.1 sq cm/s is conceivable for volatile-rich fluids. Surface tension may play an important role in creating pathways for metasomatizing fluids in the earth, but does not appear likely to affect substantially the existing estimates of large scale melt migration (e.g., beneath mid-ocean ridges).

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