Influence of melt viscosity of basaltic and andesitic composition on seismic attenuation in partially molten gabbronorite | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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

Type de publication:

Journal Article

Source:

Physics of the Earth and Planetary Interiors, Volume 167, Ticket 3-4, p.223-229 (2008)

ISBN:

0031-9201

Numéro d'accès:

WOS:000257364800010

Mots-clés:

Géochimie et cosmochimie, UMR 7154

Résumé:

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) Pas 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. (C) 2008 Elsevier B.V. All rights reserved.