Influence of melt viscosity of basaltic and andesitic composition on seismic attenuation in partially molten gabbronorite (original) (raw)

Physics of the Earth and Planetary Interiors, 2008

Abstract

The characteristic frequencies at which two different melt-related attenuation mechanisms occur in partially molten gabbronorite are computed as a function of aspect ratios of the melt-filled cracks, and the melt viscosity. The computations were done for basaltic and andesitic melts. The melt viscosity is constrained by (i) laboratory measurements performed in the range 10^8-10^14 Pa s with a creep apparatus and in the range 10^-1 to 10^5 Pa s with a rotational Couette viscorneter, and (ii) modeling of viscosity at high temperatures. The results of the characteristic frequency calculations suggest that melt squirt flow is a viable attenuation mechanism at seismic frequencies for aspect ratio of melt inclusions in the range 10^-1 to 10^-2 for the andesite, and 10^-4 to 10^-3 for the two basalts.

F R Fontaine hasn't uploaded this paper.

Let F know you want this paper to be uploaded.

Ask for this paper to be uploaded.