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Influence of melt viscosity of basaltic and andesitic composition on seismic attenuation in partially molten gabbronorite



Influence of melt viscosity of basaltic and andesitic composition on seismic attenuation in partially molten gabbronorite



Physics of the Earth and Planetary Interiors 167.3-4



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 108 -1014 Pa s with a creep apparatus and in the range 10(-1) to 105 Pa s with a rotational Couette viscometer, 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(-3) to 10(-2) for the andesite, and 10(-4) to 10(-3) for the two basalts.

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Accession: 037081438

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DOI: 10.1016/j.pepi.2008.04.010


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