0.5～1.5GPa下石膏脱水过程动态监测电导率法  

DYNAMIC MONITORING OF GYPSUM DEHYDRATION PROCESS AT 0.5～1.5 GPa——ELECTRICAL CONDUCTIVITY METHOD

作　　者：朱茂旭[1] 谢鸿森[1] 郭捷[1] 白武明[2] 许祖鸣[1] 张月明[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002 [2]中国科学院地质与地球物理研究所,北京100101

出　　处：《矿物学报》2000年第1期55-58,共4页Acta Mineralogica Sinica

基　　金：国家自然科学基金!(批准号 :4990 40 0 5 );中国科学院高温高压地球动力学开放研究实验室资助

摘　　要：在 0 .5～ 1 .5GPa,1 60～ 2 55℃条件下动态监测了石膏脱水过程中电导率随时间的变化。实验结果表明 ,脱水过程中电导率随时间的变化分两个阶段 :第一阶段电导率随时间的变化速率可间接地反映脱水反应的速率 ;第二阶段反映了流体中溶解离子的增多。相角随时间的变化可动态反映释放的水在矿物颗粒边缘的存在及连通性。电导率法是适用于含水矿物脱水过程动态监测及脱水过程中水的分布、迁移等动力学过程就位研究的有效方法。Dehydration process of gypsum was monitored by measuring the variation of electrical conductivity with time dynamically at 0.5～1.5 GPa and 160～255℃. The results showed that the variation of electrical conductivity with time during dehydration may involve two stages. The variation of electrical conductivity with time during the first stage can reflect indirectly the rates of dehydration reaction. Variations during the second stage reflect the increasing concentrations of the dissolved ions in fluids. Variations in phase angles with time can reflect dynamically the existence and connectivity of dehydrated free water. Electrical conductivity method can be used to monitor dynamically the dehydration process of hydrous minerals, and to study the distribution and migration kinetics of free water.

关 键 词：石膏 脱水过程 电导率 动态监测 

分 类 号：P578.72[天文地球—矿物学]