Measurement of elastic wave velocities in granulite and amphibolite having identical H2O-free bulk compositions up to 850°C at 1 GPa

Details Measurement of elastic wave velocities in granulite and amphibolite having identical H2O-free bulk compositions up to 850°C at 1 GPa Measurement of elastic wave velocities in granulite and amphibolite having identical H2O-free bulk compositions up to 850°C at 1 GPa

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.133..255i&link_type=abstract

Earth and Planetary Science Letters, vol. 133, Issue 3-4, pp.255-264

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10

Scientific paper

Simultaneous measurements of compressional and shear wave velocities ( V P and V S ) in two rocks with identical chemistry but with different mineral assemblages were carried out from room temperature to 850°C at 1 GPa. One of the rocks is granulite and the other is amphibolite formed from the granulite by addition of H 2 O. Both V P and V S in the granulite and amphibolite decreased linearly with increasing temperature, and there were obvious differences between the elastic wave velocities in the granulite and amphibolite. For example, the values of V P and V S at 700°C are, respectively, 7.75 km s -1 and 4.37 km s -1 for granulite and 7.40 km s -1 and 4.21 km s -1 for amphibolite. The low-velocity layer lies between the descending lithosphere and the overlying asthenosphere beneath the Japanese island arc, and the ratio of velocity drop for the low-velocity layer compared to the surroundings is approximately 5-6%. If the observed velocity drop were caused by a phase change (i.e., granulite + H 2 O amphibolite) the 5-6% velocity drop could indeed be explained by an appropriate phase change (e.g., anhydrous peridotite + H 2 O amphibole peridotite).

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