Abstract
Compressional wave velocities (Vp)were measured in situ in serpentinized olivine-bearing pyroxenite at 1.0 GPa fromroom temperature to 960°C in a multi-anvil pressure apparatus. The velocityshowed a remarkable decrease from temperature more than 500̂C which was from6.2 to 5.0 km s−1. The decline in velocity is attributed to the changes of rockfabric, including the following aspects: composition, size and shape of grain,crack, grain boundary and dislocation changes resulting from dehydrationat high temperature. The fine-granular aggregates of minerals formedthrough dehydration were chemically analysed, and they were found to becomposed of forsterite and enstatite. Dehydration of serpentine has asignificant effect on the low-velocity zone and earthquake generation.
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