大陆中、下地壳电学特征实验研究①

高温高压下地壳物质电导率的实验室测定是研究大陆中、下地壳高导层成因的重要方法之一。研究表明，水、石墨、部分熔融以及矿物脱水都可能形成地壳高导层，在不同构造环境和深度下这些机制起着不同的作用。为解释中地壳高导层，水的存在是必不可少的条件，在下地壳，水、石墨、部分熔融以及矿物脱水、甚至特定的干的下地壳岩石都可解释大地电磁测量结果。

ELECTRICAL PROPERTY EXPERIMENTAL STUDIES ON THE MID AND LOWER CO NTINENTAL CRUST

Experimental measurement of electrical conductivity of the Earth's materials is important to our understanding of the genesis of highly conductive layers(HCL)in the mid and lower continental crust At present,some experimental results show that saline water,graphite,partial melting and dehydration of some minerals,may be responsible for the formation of HCL,and that one or more mechanisms may be combined to contribute to the formation of HCL in various tectonic backgrounds and at different depths Existence of brine is necessary to explain HCL in the mid continental crust regardless of rock types.In the lower continental crust,all mechanisms mentioned above,even specific dry lower continental rocks,can interpret field MT measurements