Abstract: The conductivity,P-wave velocity and the strengh of chlorite-schist and plagiochase amphi-bolite were measured at high P T conditions.It has been shown that the dehydration of water-bearing minerals wolild lend to abnormal changes of physical and mechanical properties.The dehydrating temperature decreased with increasing pressure at semi-sealed condition. It has beenpresented that the dehydration of water-bearing minerals in chlorite-schist and plagichase amphi-bolite should be the cause of the low-velocity/high conductivity layer(or body)in North Chinacrust,This layer(body)should also be a soft layer(body)with low strgngth,favourable to theoccurrence of earthquake.

Key words: Chlorite-schist, Plagichase amphiboite, High temperature and high pressure, P-wave velocity, Conductivity

摘要： 在高温高压下绿泥石片岩和斜长角闪岩中含水矿物的脱水作用可以引起岩石物理力学性质的异常变化。在半封闭条件下,含水矿物的脱水温度有随压力增加而降低的趋势。脱水作用可能是华北地区壳内低速高导层(体)的形成原因之一。这一低速高导层(体)同时也是低强度的软弱层(体),有利于地震在其上覆脆性岩层中的孕育与发生。

关键词: 绿泥石片岩, 斜长角闪岩, 高温高压实验, 波速, 电导率