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The influence of dehydration on the electrical conductivity of trachyandesite at high temperatures and high pressures
Lidong Dai;   Keshi Hui;   Wenqing Sun;  Haiying Hu;  Heping Li;  Jianjun Jiang
2017
发表期刊Journal of Materials Science and Engineering A
页码229-240
摘要

The electrical conductivity of trachyteandesite was measured in situ under conditions of pressure range from 0.5-2.0 GPa and temperature range from 773-1,323 K using a YJ-3000t multi-anvil press and a Solartron-1260 Impedance/Gain-phase Analyzer. The experimental results indicate that the electrical conductivity of trachyteandesite increases with increasing temperature and decreases with a rise in pressure. The relationship between the electrical conductivity (σ) and temperature (T) conforms to the Arrhenius equation within a certain temperature range. When the temperature rises to 923 K, the electrical conductivity of trachyandesite abruptly increases. This result demonstrates that trachyandesite begins to dehydrate at ~923 K and produces magnetite with a high-conductivity mineral phase after dehydration. The intergrowth of interconnected magnetite is the cause for the ~2 orders of magnitude increase in the electrical conductivity after dehydration. The interconnected high-conductivity mineral phase of magnetite in the dehydration product of the trachyandesite sample can be used to reasonably explain the high-conductivity anomalies in the South-Central Chilean subduction zone beneath the Andes.

关键词High Pressure Trachyandesite Electrical Conductivity Dehydration High-conductivity Anomaly
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8339
专题地球内部物质高温高压实验室
作者单位1.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China
2.University of Chinese Academy of Sciences, Beijing 100039, China
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Lidong Dai; Keshi Hui; Wenqing Sun;Haiying Hu;Heping Li;Jianjun Jiang. The influence of dehydration on the electrical conductivity of trachyandesite at high temperatures and high pressures[J]. Journal of Materials Science and Engineering A,2017:229-240.
APA Lidong Dai; Keshi Hui; Wenqing Sun;Haiying Hu;Heping Li;Jianjun Jiang.(2017).The influence of dehydration on the electrical conductivity of trachyandesite at high temperatures and high pressures.Journal of Materials Science and Engineering A,229-240.
MLA Lidong Dai; Keshi Hui; Wenqing Sun;Haiying Hu;Heping Li;Jianjun Jiang."The influence of dehydration on the electrical conductivity of trachyandesite at high temperatures and high pressures".Journal of Materials Science and Engineering A (2017):229-240.
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