GYIG OpenIR  > 地球内部物质高温高压实验室
Influence of dehydration on the electrical conductivity of epidote and implications for high‐conductivity anomalies in subduction zones
Haiying Hu;  Lidong Dai;  Heping Li;  Keshi Hui;  Wenqing Sun
2017
Source PublicationJournal of Geophysical Research: Solid Earth
Pages2751-2762
Abstract

The anomalously high electrical conductivities (~0.1 to 1 S/m) in deep mantle wedge regions extensively detected by magnetotelluric studies are often associated with the presence of fluids released from the progressive dehydration of subducting slabs. Epidote minerals are the Ca-Al-rich hydrous silicates with huge stability fields exceeding those of amphibole (>70–80 km) in subducting oceanic crust, and they may therefore be transported to greater depth than amphibole and release water to the mantle wedge. In this study, the electrical conductivities of epidote were measured at 0.5–1.5 GPa and 573–1273 K by using a Solartron-1260 Impedance/Gain-Phase Analyzer in a YJ-3000t multianvil pressure within the frequency range of 0.1–106 Hz. The results demonstrate that the influence of pressure on electrical conductivity of epidote is relatively small compared to that of temperature. The dehydration reaction of epidote is observed through the variation of electrical conductivity around 1073 K, and electrical conductivity reaches up to ~1 S/m at 1273 K, which can be attributed to aqueous fluid released from epidote dehydration. After sample dehydration, electrical conductivity noticeably decreases by as much as nearly a log unit compared with that before dehydration, presumably due to a combination of the presence of coexisting mineral phases and aqueous fluid derived from the residual epidote. Taking into account the petrological and geothermal structures of subduction zones, it is suggested that the aqueous fluid produced by epidote dehydration could be responsible for the anomalously high conductivities in deep mantle wedges at depths of 70–120 km, particularly in hot subduction zones.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8352
Collection地球内部物质高温高压实验室
Affiliation1.Key Laboratory for High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou, China
2.University of Chinese Academy of Sciences, Beijing, China
Recommended Citation
GB/T 7714
Haiying Hu;Lidong Dai;Heping Li;Keshi Hui;Wenqing Sun. Influence of dehydration on the electrical conductivity of epidote and implications for high‐conductivity anomalies in subduction zones[J]. Journal of Geophysical Research: Solid Earth,2017:2751-2762.
APA Haiying Hu;Lidong Dai;Heping Li;Keshi Hui;Wenqing Sun.(2017).Influence of dehydration on the electrical conductivity of epidote and implications for high‐conductivity anomalies in subduction zones.Journal of Geophysical Research: Solid Earth,2751-2762.
MLA Haiying Hu;Lidong Dai;Heping Li;Keshi Hui;Wenqing Sun."Influence of dehydration on the electrical conductivity of epidote and implications for high‐conductivity anomalies in subduction zones".Journal of Geophysical Research: Solid Earth (2017):2751-2762.
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