蛇纹石化碱性橄榄石玄武岩、水和氢氧化钠溶液的高温高压实验研究

Experimental Researches of Serpentinized Alkaline Olivine Basalt,H 2O and NaOH Solution at High Pressure and Temperature

蛇纹石化碱性橄榄石玄武岩、水和氢氧化钠溶液的高温高压实验研究宋茂双（中国科学院地球化学研究所，贵阳５５０００２）关键词高温高压碱性玄武岩Ｐ波速度熔融－结晶蛇纹石脱水温度作者测量了高温高压下蛇纹石化碱性橄榄玄武岩的Ｐ波速度、蛇纹石脱水温度和Ｈ２Ｏ及Ｎａ...

At 0～5.5 GPa and 25～1 250℃ ,the P wave velocities of alkaline olivine basalt were measured and the effect of pressure,temperature,serpentine dehydration and basalt eclogite transformation of P wave velocity were studied.It is verified that there exists softening effect in the pressure range of our experiments.Dehydration temperature of serpentine at 1～5.0 GPa was determined by the measurement of electrical conductance tempreaure curves and its dehydration mechanism was discussed.Melting crystallizing expreiments of basalt+H 2O system at high pressure indicated that pressure was the most important factor to affect the assemblage and mineral composition of experimental products.At 0～5.0 GPa and 25～500℃,the electrical properties of H 2O and NaOH+H 2O system were measured by the method of AC impedance measurement. The activation energy of NaOH+H 2O system was also calculated and the pressure and temperature dependence of electrical conductivity,dielectric constand and activation energy were studied according to our experimental results.