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| Effect of chemical composition on the electrical conductivity of gneiss at high temperatures and pressures | |
| Lidong Dai; Wenqing Sun; Heping Li; Haiying Hu; Lei Wu; Jianjun Jiang | |
| 2018 | |
| Source Publication | Solid Earth
 |
| Issue | 9Pages:233–245 |
| Abstract | The electrical conductivity of gneiss samples with different chemical compositions (WA = Na2O + K2O + CaO = 7.12, 7.27 and 7.64 % weight percent) was measured using a complex impedance spectro
scopic technique at 623–1073 K and 1.5 GPa and a frequency range of 10-1 to 106 Hz. Simultaneously, a pressure effect on the electrical conductivity was also determined for the WA = 7.12 % gneiss. The results indicated that the gneiss conductivities markedly increase with total alkali and calcium ion content. The sample conductivity and
temperature conform to an Arrhenius relationship within a certain temperature range. The inflfluence of pressure on gneiss conductivity is weaker than temperature, although conductivity still increases with pressure. According to various ranges of activation enthalpy (0.35–0.52 and 0.76– 0.87 eV) at 1.5 GPa, two main conduction mechanisms
are suggested that dominate the electrical conductivity of gneiss: impurity conduction in the lower-temperature region and ionic conduction (charge carriers are K+, Na+ and Ca2+) in the higher-temperature region. The electrical conductivity of gneiss with various chemical compositions cannot be used to interpret the high conductivity anomalies in the Dabie–Sulu ultrahigh-pressure metamorphic belt. However, the conductivity–depth profifiles for gneiss may provide an important constraint on the interpretation of
fifield magnetotelluric conductivity results in the regional metamorphic belt. |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/42920512-1/10111 |
| Collection | 地球内部物质高温高压实验室 |
| Affiliation | 1.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China 2.University of Chinese Academy of Sciences, Beijing, 100049, China |
| Recommended Citation GB/T 7714 | Lidong Dai；Wenqing Sun；Heping Li；Haiying Hu；Lei Wu；Jianjun Jiang. Effect of chemical composition on the electrical conductivity of gneiss at high temperatures and pressures[J]. Solid Earth,2018(9):233–245. |
| APA | Lidong Dai；Wenqing Sun；Heping Li；Haiying Hu；Lei Wu；Jianjun Jiang.(2018).Effect of chemical composition on the electrical conductivity of gneiss at high temperatures and pressures.Solid Earth(9),233–245. |
| MLA | Lidong Dai；Wenqing Sun；Heping Li；Haiying Hu；Lei Wu；Jianjun Jiang."Effect of chemical composition on the electrical conductivity of gneiss at high temperatures and pressures".Solid Earth .9(2018):233–245. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Effect of chemical c（3542KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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