高温高压下黑云斜长片麻岩的电性研究

黄晓葛; 白武明; 周文戈

doi:10.11858/gywlxb.2008.03.003

高温高压下黑云斜长片麻岩的电性研究

doi: 10.11858/gywlxb.2008.03.003

1.
中国科学院地质与地球物理研究所，北京 100029；
2.
中国科学院贵阳地球化学研究所，贵州贵阳 550002

详细信息

通讯作者:
黄晓葛

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出版历程
- 收稿日期: 2007-06-09
- 修回日期: 2007-08-29
- 发布日期: 2008-09-05

Experimental Study on Electrical Conductivity of Biotite- and Plagioclase-Bearing Gneiss at High Temperature and High Pressure

1.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
2.
Institute of Geochemitry, Chinese Academy of Sciences, Guiyang 550002, China

More Information

Corresponding author: HUANG Xiao-Ge

摘要

摘要: 在压力1 GPa、温度250~1 100 ℃、频率0.1 Hz~1 MHz的条件下，采用阻抗谱方法，对来自阴山造山带的太古代黑云斜长片麻岩进行了电导率实验研究。实验发现：（1）所有样品的阻抗谱都是由一个大的高频半圆弧Ⅰ和一个小的被压缩了的低频弧Ⅱ组成，阻抗弧Ⅰ主要代表矿物颗粒内部传导机制，阻抗弧Ⅱ更有可能代表的是样品和电极之间的传导机制；（2）电导率随温度的变化遵循Arrhenian定律，但在700~750 ℃间有近一个量级的跳跃，通过对比实验前后样品的显微照片和探针分析数据，认为这一电导率的大幅跳跃可能是样品中黑云母发生大量脱水熔融的缘故；（3）在高温段750~1 100 ℃，部分熔融样品的电导率主要由钠离子传导控制；（4）在低温段250~700 ℃，样品的激活能为0.53 eV；在高温段750~1 100 ℃，样品的激活能为1.41 eV。激活能的改变可能与样品的结构变化有关，还与样品和熔体中钠的含量以及扩散有关。
- 电导率 /
- 黑云斜长片麻岩 /
- 激活能 /
- 阴山造山带
Abstract: We have investigated the electrical properties of rock sample from Yinshan orogenic zone by in situ complex impedance spectroscopy using a multianvil apparatus. The electrical conductivity was measured at pressure of 1 GPa and temperature from 250 ℃ to 1 100 ℃ at frequencies from 0.1 Hz to 1 MHz. The data of resistance were obtained by using an equivalent circuit fitting technique. From these measurements we determined the electrical conductivity of the Archean metamorphic biotite- and plagioclase-bearing gneiss. The experimental results indicate that (1) each spectrum consists of an almost semicircular high-frequency arc Ⅰand a depressed high-frequency arc Ⅱ.The impedance spectrum Ⅰ is dominated by grain-interior response; the impedance spectrum Ⅱ is dominated by the sample-electrode interface impedance. (2) Electrical conductivity displays Arrhenian behavior respectively over investigated temperature range from 250 ℃ to 700 ℃ and from 750 ℃ to 1 100 ℃. However, it rapidly increases from 700 ℃ to 750 ℃. This jump is due to dehydration-melting of biotite within sample based on the comparative analysis of SEM photoes and electron probe data for pre-run and post-run samples. (3) Over higher temperature range (750~1 100 ℃), sodium is the dominating charge carrier in partially molten samples. (4) The activation energy of biotite- and plagioclase-bearing gneiss is 0.53 eV over range of temperature from 250 ℃ to 700 ℃. However, the activation energy of partially molten sample is 1.41 eV over range of temperature from 750 ℃ to 1 100 ℃. This change of activation energy has relations with sodium content and mobility in melt. It is possibly due to the change of structure between mineral and melt within samples.
- electrical conductivity /
- gneiss /
- activation energy /
- Yinshan orogenic zone

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