摘要
Dehydration temperatures of serpentine were measured in the pressure range between1. 0 GPa and 5. 0 GPa by using the electrical conductivity method simultaneously at high temperatures and high pressures. The results show that with increasing pressure the dehydrationtemperature of antigorite increases slightly below 2. 0 GPa, but drops markedly above 2. 0GPa. This strongly suggests that high pressure would favor the dehydration of serpentine minerals and the water released thereby would be an important source of fluids involved in magmatism in a subduction zone and mantle metasomatism. Meanwhile, the greatly enhanced electricconductivity in the presence of water may be one of the reasons underlying the occurrence of ahigh-conductivity zone in the lower crust.
Dehydration temperatures of serpentine were measured in the pressure range between1. 0 GPa and 5. 0 GPa by using the electrical conductivity method simultaneously at high temperatures and high pressures. The results show that with increasing pressure the dehydrationtemperature of antigorite increases slightly below 2. 0 GPa, but drops markedly above 2. 0GPa. This strongly suggests that high pressure would favor the dehydration of serpentine minerals and the water released thereby would be an important source of fluids involved in magmatism in a subduction zone and mantle metasomatism. Meanwhile, the greatly enhanced electricconductivity in the presence of water may be one of the reasons underlying the occurrence of ahigh-conductivity zone in the lower crust.
