Partial melting and the low-velocity zone

Details Partial melting and the low-velocity zone Partial melting and the low-velocity zone

Dec 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970pepi....4...62a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 4, Issue 1, p. 62-64.

Physics

9

Scientific paper

The effect of partial melting on the elastic properties of polycrystalline material is a strong function of the shape of the melt zones. If the lowest melting constituents are concentrated in narrow zones, such as grain boundaries, a small amount of melt, ~ 1%, can easily explain the upper mantle low-velocity zone, for both shear waves and compressional waves. The Eshelby-Walsh theory for the effective elastic moduli for a material with oblate spheroidal inclusions is used to calculate the compressional and shear velocities in a solid matrix with penny-shaped melt zones as a function of melt concentration and aspect ratio. Previous calculations, sbased on MacKenzie's (1950) and Sato's (1952) results for spherical inclusions, show a very weak dependence of velocity on melt concentration. The Eshelby-Walsh theory satisfactorily explains the velocities in the two-phase ice-brine system.

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