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Influence of temperature, pressure, and oxygen fugacity on the electrical conductivity of dry eclogite, and geophysical implications
Lidong Dai; Haiying Hu; Heping Li; Lei Wu; Keshi Hui; Jianjun Jiang; Wenqing Sun
2016
发表期刊Geochemistry, Geophysics, Geosystems
卷号17期号:6页码:2394-2407
摘要

The electrical conductivity of eclogite was measured at temperatures of 873-1173 K and pressures of 1.0-3.0 GPa within a frequency range of 0.1-10(6) Hz using a YJ-3000t multianvil press and Solartron-1260 impedance/gain-phase analyzer. Three solid-state oxygen buffers (Cu+CuO, Ni+NiO, and Mo+MoO2) were employed to control the oxygen fugacity. Experimental results indicate that the electrical conductivity of the samples tended to increase with increasing temperature, conforming to an Arrhenius relation. Under the control of a Cu+CuO oxygen buffer, the electrical conductivity of the eclogite decreased with a rise in pressure, and its corresponding activation volume and activation energy at atmospheric pressure were calculated as -2.510.29 cm(3)/mole and 0.860.12 eV, respectively. At 2.0 GPa, the electrical conductivity of the eclogite increased with increasing oxygen fugacity, and the preexponential factor increased while the activation enthalpy decreased. The observed positive exponential factor for the dependence of electrical conductivity on oxygen fugacity, as well as the negative activation volume, confirm that the hopping of small polarons is the dominant conduction mechanism in eclogite at high temperatures and pressures. Our results suggest that the electrical conductivity of dry eclogite under various redox conditions cannot explain the high anomalies in conductivity under stable midlower continental crust and under the Dabie-Sulu ultrahigh-pressure metamorphic belt of eastern China.

学科领域地球深部物质与流体作用地球化学
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/6517
专题地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文
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GB/T 7714
Lidong Dai,Haiying Hu,Heping Li,et al. Influence of temperature, pressure, and oxygen fugacity on the electrical conductivity of dry eclogite, and geophysical implications[J]. Geochemistry, Geophysics, Geosystems,2016,17(6):2394-2407.
APA Lidong Dai.,Haiying Hu.,Heping Li.,Lei Wu.,Keshi Hui.,...&Wenqing Sun.(2016).Influence of temperature, pressure, and oxygen fugacity on the electrical conductivity of dry eclogite, and geophysical implications.Geochemistry, Geophysics, Geosystems,17(6),2394-2407.
MLA Lidong Dai,et al."Influence of temperature, pressure, and oxygen fugacity on the electrical conductivity of dry eclogite, and geophysical implications".Geochemistry, Geophysics, Geosystems 17.6(2016):2394-2407.
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