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Effect of dehydration on the electrical conductivity of phyllite at high temperatures and pressures

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Abstract

The electrical conductivity of phyllite (measured in situ at 0.5–2.5 GPa and 773–1173 K) increases with increasing temperature, satisfying an Arrhenius relation. Dehydration of phyllite at 973–1173 K enormously enhances its electrical conductivity, and the activation enthalpy (0.64–0.81 eV) remains almost constant before and after dehydration. The inflection point of the relationship between electrical conductivity and temperature is used to determine the dehydration temperature (T d ) at each considered pressure (P), leading to the following relationship: T d  = 1181 − 100P. The derived relation implies that the dehydration depths of hot and cold subduction zones are ~70 and ~129 km respectively, which are both close to the depths of arc magma source regions, thereby indicating that the dehydration of pelite significantly influences the generation of melt in subduction zones.

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Acknowledgements

Constructive reviews of two anonymous experts are gratefully acknowledged. This research was financially supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB 18010401), Key Research Projects of the Frontier Science of the Chinese Academy of Sciences (QYZDB-SSW-DQC009), “135” Program of the Institute of Geochemistry of CAS, Hundred Talents Program of CAS, Youth Innovation Promotion Association of CAS, NSF of China (41474078, 41304068 and 41174079) and Open Foundation of Institute of Geology and Geophysics of CAS.

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  1. Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China

    Wenqing Sun, Lidong Dai, Heping Li, Haiying Hu, Jianjun Jiang & Keshi Hui

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Wenqing Sun, Jianjun Jiang & Keshi Hui

  3. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Haiying Hu

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  1. Wenqing Sun
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Correspondence to Lidong Dai.

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Editorial handling: M.A.T.M. Broekmans

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Sun, W., Dai, L., Li, H. et al. Effect of dehydration on the electrical conductivity of phyllite at high temperatures and pressures. Miner Petrol 111, 853–863 (2017). https://doi.org/10.1007/s00710-017-0494-2

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