The effect of an equilibrated melt phase on the shear creep and attenuation behavior of polycrystalline olivine

Details The effect of an equilibrated melt phase on the shear creep and attenuation behavior of polycrystalline olivine The effect of an equilibrated melt phase on the shear creep and attenuation behavior of polycrystalline olivine

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2341g&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 15, p. 2341-2344

Physics

18

Mineral Physics: Creep And Deformation, Physical Properties Of Rocks: Plasticity, Diffusion, And Creep, Physical Properties Of Rocks: Wave Attenuation, Seismology: Lithosphere And Upper Mantle

Scientific paper

The impact of a chemically and texturally equilibrated melt phase on the shear creep and attenuation behaviors of polycrystalline olivine has been measured experimentally at seismic-to-subseismic frequencies. The experiments were performed on aggregates that had a particularly uniform and fine grain size (~3 μm). The effect of the melt phase (~5 vol%) is to decrease the (Newtonian) viscosity by a factor of ~6 there is no dramatic disaggregation effect or melt-induced plummeting of the shear modulus. Both the melt-free and melt-bearing aggregates display an attenuation ``band'' of the form QG-1~f-0.4. This response cannot be attributed to a variation in microstructure; it is intrinsic to the diffusional creep behavior. There is no unique effect of the melt phase on the attenuation response: the slight increase in absorption of partial melt specimens is explained fully by the effect of the texturally equilibrated melt on aggregate viscosity.

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