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	Influence of temperature, pressure, and oxygen fugacity on the electrical conductivity of dry eclogite, and geophysical implications
	Dai, Lidong1; Hu, Haiying1; Li, Heping1; Wu, Lei1; Hui, Keshi1; Jiang, Jianjun1,2; Sun, Wenqing1,2
刊名	Geochemistry geophysics geosystems
	2016-06-01
卷号	17期号:6页码:2394-2407
关键词	Electrical conductivity Eclogite Oxygen fugacity Small polaron Dabie-sulu uhpm belt High pressure
ISSN号	1525-2027
DOI	10.1002/2016gc006282
通讯作者	Dai, lidong(dailidong@vip.gyig.ac.cn)
英文摘要	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.
WOS关键词	POLYCRYSTALLINE OLIVINE COMPACTS ; RADIOGENIC HEAT-PRODUCTION ; IN-SITU CONTROL ; HYDROGEN DIFFUSION ; CONTINENTAL-CRUST ; WATER-CONTENT ; LABORATORY MEASUREMENTS ; CHEMICAL-COMPOSITION ; OXIDATION-STATE ; TRANSITION ZONE
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000380728300023
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2374475
专题	中国科学院大学
通讯作者	Dai, Lidong
作者单位	1.Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Dai, Lidong,Hu, Haiying,Li, Heping,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	Dai, Lidong.,Hu, Haiying.,Li, Heping.,Wu, Lei.,Hui, Keshi.,...&Sun, Wenqing.(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	Dai, Lidong,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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