含水矿物电导率研究进展  

Review of studies on electrical conductivity of hydrous minerals

作　　者：王丽冰 王多君 申珂玮 WANG Libing;WANG Duojun;SHEN Kewei(High Pressure Science Center, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences,Beijing 100049, China)

机构地区：[1]中国科学院大学地球与行星科学学院高压科学中心,北京100049

出　　处：《中国科学院大学学报（中英文）》2022年第4期433-448,共16页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金重大研究计划重点项目(91958216);国家自然科学基金(41874104);中央高校基本科研业务费资助。

摘　　要：含水矿物对于地球内部水循环非常重要,通过研究典型含水矿物的电导率可以获得地球内部水循环的路径和物质成分的变化。归纳高温高压下典型含水矿物脱水前后的电导率结果、导电机制、脱水机制和地球物理应用。含水矿物脱水前电导率普遍在10^(-4) S/m,脱水后电导率显著增加,不同含水矿物电导率存在差异。脱水机制与导电机制耦合可能决定了含水矿物脱水过程的电导率,而脱水后体系的电导率一般取决于流体的成分和连通度。含水矿物脱水前后电导率的变化可以为解释俯冲带不同深度的高导异常提供实验依据;确定含水矿物分解产生的流体的成分可以为认识俯冲带物质循环带来启示。在已有研究基础上,展望了含水矿物电导率未来的研究方向。Hydrous minerals play a vital role in the Earth’s interior water cycle.The path of water cycle and the change of composition in the Earth’s interior can be estimated by the electrical conductivity of typical hydrous minerals.In this paper,we summarized the electrical conductivities,conduction mechanisms,dehydration mechanisms and geophysical implications for typical hydrous minerals before and after dehydration under high temperatures and pressures.The electrical conductivities of most hydrous minerals before dehydration are generally distributed at 10^(-4) S/m,and increase significantly after dehydration.There are differences in the electrical conductivities of different hydrous minerals.The coupling of dehydration mechanisms and conduction mechanisms may determine the electrical conductivity of hydrous minerals during dehydration.The electrical conductivity of hydrous minerals after dehydration generally depends on the composition and connectivity of the fluid.The changes of electrical conductivities of hydrous minerals before and after dehydration provide experimental constraints for the high-conductivity anomalies at different depths in subduction zones.In addition,the determination of the composition of the fluid derived from the dehydration of the hydrous minerals enriched our knowledge of material circulation in subduction zones.Based on the recent progress,the potential research directions of the electrical conductivity of hydrous minerals are prospected.

关 键 词：含水矿物 电导率 高温高压实验 俯冲带 导电机制 脱水模型 

分 类 号：P313[天文地球—固体地球物理学]