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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2017-103
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
27 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
Effect of chemical composition on the electrical conductivity of gneiss at high temperatures and pressures
Lidong Dai1, Wenqing Sun1,2, Heping Li1, Haiying Hu1, Lei Wu1, and Jianjun Jiang1,2 1Key Laboratory of High - Temperature and High - Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
2University of Chinese Academy of Sciences, Beijing, 100049, China
Abstract. Electrical conductivities of the gneiss samples with different chemical compositions [WA=Na2O+K2O+CaO=7.12 %, 7.27 % and 7.64 % in weight percent] were measured using a complex impedance spectroscopic technique at 623–1073 K and 1.5 GPa in the frequency range of 10−1 to 106 Hz. In addition, conductivities of gneiss with WA = 7.12 % were measured at 623‒1073 K and 0.5‒2.0 GPa. The results indicated that the conductivities of gneiss markedly increase with the increase of the total content of alkali and calcium ions. The conductivity of gneiss and temperature conform to an Arrhenius relation at a certain temperature range. The influence of pressure on conductivity of gneiss is weaker than that of temperature, and the conductivity increases with the increasing pressure. According to the various ranges of activation enthalpy (0.35‒0.52 eV and 0.76‒0.87 eV) corresponding to higher and lower temperature regions at 1.5 GPa, two main conduction mechanisms were suggested to dominate the conductivity of gneiss: impurity conduction in the lower temperature region and ionic conduction (charge carriers are K+, Na+ and Ca2+) in the higher temperature region. Finally, it was confirmed that gneisses with various chemical compositions can’t cause the high conductivity layers (HCLs) in Dabie-Sulu ultrahigh-pressure metamorphic belt.

Citation: Dai, L., Sun, W., Li, H., Hu, H., Wu, L., and Jiang, J.: Effect of chemical composition on the electrical conductivity of gneiss at high temperatures and pressures, Solid Earth Discuss., https://doi.org/10.5194/se-2017-103, in review, 2017.
Lidong Dai et al.
Lidong Dai et al.
Lidong Dai et al.

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