| 高温高压下角闪片麻岩的电导率研究 |
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| 引用本文： | 于英杰,王多君,郭颖星,李和平,刘在洋,李丹阳.高温高压下角闪片麻岩的电导率研究[J].地球物理学报,2011,54(3):764-770. |
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| 作者姓名： | 于英杰 王多君 郭颖星 李和平 刘在洋 李丹阳 |
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| 作者单位： | 1. 中国科学院研究生院计算地球动力学重点实验室,中国科学院研究生院,北京 100049;
2. 地球深部物质与流体作用地球化学实验室,中国科学院地球化学研究所,贵阳 550002 |
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| 基金项目： | 中央级公益性科研院所基本科研业务专项，中国科学院知识创新工程重要方向项目，国家自然科学基金项目 |
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| 摘 要： | 在1.0 GPa压力、343～962 K温度和0.1～106Hz频率的条件下,使用Solartron 1260阻抗-增益/相位分析仪对含角闪石的片麻岩从平行和垂直面理两个不同方向分别进行了电阻抗的测定,并且进一步分析了片麻岩的微观导电机制.高温高压实验结果表明:片麻岩的复阻抗对温度、频率表现出明显的依赖性.片麻岩的电导...
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| 关 键 词： | 高温高压 片麻岩 电导率 阻抗谱 导电机制 |
| 收稿时间： | 2010-09-06 |
The electrical conductivity of amphibole-bearing gneiss at high temperature and high pressure |
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| YU Ying-Jie,WANG Duo-Jan,GUO Ying-Xing,LI He-Ping,LIU Zai-Yang,LI Dan-Yang.The electrical conductivity of amphibole-bearing gneiss at high temperature and high pressure[J].Chinese Journal of Geophysics,2011,54(3):764-770. |
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| Authors: | YU Ying-Jie WANG Duo-Jan GUO Ying-Xing LI He-Ping LIU Zai-Yang LI Dan-Yang |
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| Institution: | 1. Key Laboratory of Computational Geodynamics, Graduate University, Chinese Academy of Sciences, Beijing 100049, China;
2. Laboratory for Study of Earth's Interior and Geofluids, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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| Abstract: | We conducted electrical impedance spectra measurements parallel and perpendicular to foliation in dry gneiss at 1.0 GPa and 343~962 K within the frequency range of 0.1~106 Hz using a 1260 impedance analyzer. The high temperature and pressure experimental results indicate that impedance spectrum strongly depends upon the variation of frequency and temperature. The electrical conductivity of gneiss is remarkably anisotropic, the electrical conductivity parallel to foliation shows the highest value. Dehydration may alter the conduction mechanisms and enhance the electrical conductivity of gneiss. The activation enthalpies of gneiss derived are about 0.31 eV and 0.56 eV at low temperature ranges, in contrast, the activation enthalpies with values of 2.24 eV and 4.21 eV are obtained at high temperature ranges, respectively. A comparison between experimental results with data derived from electromagnetic soundings indicates that the dehydration of amphibole-bearing gneiss may provide an alternative explanation for high-conductivity layer. |
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| Keywords: | High temperature and high pressure Gneiss Electrical conductivity Conductivity impedance spectrum Conduction mechanism |
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