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Solid Earth An interactive open-access journal of the European Geosciences Union
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Volume 6, issue 3
Solid Earth, 6, 1037-1043, 2015
https://doi.org/10.5194/se-6-1037-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Solid Earth, 6, 1037-1043, 2015
https://doi.org/10.5194/se-6-1037-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 02 Sep 2015

Research article | 02 Sep 2015

Experimental study on the electrical conductivity of quartz andesite at high temperature and high pressure: evidence of grain boundary transport

K. S. Hui1,2, H. Zhang1, H. P. Li1, L. D. Dai1, H. Y. Hu1, J. J. Jiang1,2, and W. Q. Sun1,2 K. S. Hui et al.
  • 1Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. In this study, the electrical conductivity of quartz andesite was measured in situ under conditions of 0.5–2.0 GPa and 723–973 K using a YJ-3000t multi-anvil press and a Solartron-1260 Impedance/Gain-Phase Analyzer. Experimental results indicate that grain interior transport controls the higher frequencies (102–106 Hz), whereas the grain boundary process dominates the lower frequencies (10−1–102 Hz). For a given pressure and temperature range, the relationship between Log σ and T−1 follows the Arrhenius relation. As temperature increased, both the grain boundary and grain interior conductivities of quartz andesite increased; however, with increasing pressure, both the grain boundary and grain interior conductivities of the sample decreased. By the virtue of the dependence of grain boundary conductivity on pressure, the activation enthalpy and the activation volume were calculated to be 0.87–0.92 eV and 0.56 ± 0.52 cm3 mol−1, respectively. The small polaron conduction mechanism for grain interior process and the ion conduction mechanism for grain boundary process are also discussed.

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Similar to temperature and pressure, grain boundary greatly affects the electrical properties of rocks. However, the relation between the total conductivity, grain boundary and grain interior conductivity for andesite remains unclear till now. In this study, the grain boundary electrical conductivity of quartz andesite was measured, and the conduction mechanism was discussed.
Similar to temperature and pressure, grain boundary greatly affects the electrical properties...
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