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Shear wave velocity in partially molten peridotite at high pressures



Shear wave velocity in partially molten peridotite at high pressures



Year Book - Carnegie Institution of Washington 79): 307-310



Direct measurements of the compressional wave velocity (Vp) in partially molten peridotite were made at high pressures for the first time last year (Year Book 78, 559-562). It was found that at 5 kbar, a 5% decrease in Vp, as observed for the low-velocity zone of the upper mantle (e.g., Nur, 1974), implies a maximum of 7-9 vol % melting. It was evident, however, that measurements were needed at higher pressures and that an investigation was required of the effect of melting on the shear wave velocity (Vs), which according to the Eshelby-Walsh theory should be more sensitive to melting than Vp (Anderson and Spetzler, 1970). In the present studies Vs was measured at 5 and 10 kbar, and the degree of melting was measured as a function of temperature through the melting range of the peridotite at 10 kbar.

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