Abstract
P-wave velocities (VP) andelectrical conductivities (σ)in serpentinite, collected from Ailaoshan orogenic belt, Yunnan province,China, were measured at 2.0–3.5 GPa and high temperature with the pulsetransmission–reflection combined method and impedance spectroscopyby the means of a multi-anvil pressure apparatus, the YJ-3000 press.VP decreasedand σincreased markedly at temperature higher than about 560°C. It is arguedthat the onset of the dehydration of serpentine is the main cause forVP decreasingand σincreasing. Combining the present experimental data with the results of previousexperiments, we were led to speculate that the formation of the low-velocity layerbetween the subducted slab and mantle wedge is closely related to thedehydration of serpentine.
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