Review of studies on electrical conductivity of hydrous minerals

doi:10.7523/j.ucas.2022.027

Abstract

Abstract: Hydrous minerals play a vital role in the Earth's interior water cycle. The path of water cycle and the change of composition in the Earth's interior can be estimated by the electrical conductivity of typical hydrous minerals. In this paper, we summarized the electrical conductivities, conduction mechanisms, dehydration mechanisms and geophysical implications for typical hydrous minerals before and after dehydration under high temperatures and pressures. The electrical conductivities of most hydrous minerals before dehydration are generally distributed at 10^-4S/m, and increase significantly after dehydration. There are differences in the electrical conductivities of different hydrous minerals. The coupling of dehydration mechanisms and conduction mechanisms may determine the electrical conductivity of hydrous minerals during dehydration. The electrical conductivity of hydrous minerals after dehydration generally depends on the composition and connectivity of the fluid. The changes of electrical conductivities of hydrous minerals before and after dehydration provide experimental constraints for the high-conductivity anomalies at different depths in subduction zones. In addition, the determination of the composition of the fluid derived from the dehydration of the hydrous minerals enriched our knowledge of material circulation in subduction zones. Based on the recent progress, the potential research directions of the electrical conductivity of hydrous minerals are prospected.

Key words: hydrous minerals, electrical conductivity, high pressure and temperature experiment, subduction zone, conduction mechanism, dehydration model

CLC Number:

P313

WANG Libing, WANG Duojun, SHEN Kewei. Review of studies on electrical conductivity of hydrous minerals[J]. Journal of University of Chinese Academy of Sciences, 2022, 39(4): 433-448.

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