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The effect of pressure on the electrical conductivity of olivine under the hydrogen-rich conditions | |
Lidong Dai; Shun-ichiro Karato | |
2014 | |
发表期刊 | Physics of the Earth and Planetary Interiors |
卷号 | 232期号:1页码:51-56 |
摘要 | The influence of pressure on the hydrogen-assisted electrical conductivity in olivine has been studied under conditions of 4-10 GPa and 873-1273 K. Synthetic polycrystalline olivine samples with the water content of 160 ppm wt (Paterson calibration) were used and the electrical conductivity was determined from the results of the impedance spectroscopy. We found that the pressure reduces the hydrogen-assisted electrical conductivity, but its magnitude is small: between 4 and 10 GPa, the difference is a factor of similar to 2.5 for the same water content and temperature. The pressure dependence is characterized by a negative activation volume and the negative dependence of the pre-exponential factor on pressure. Such anomalous behavior is explained by a model where hydrogen-related defect is considered as a weak inclusion in a strong matrix. We use these new data to calculate the electrical conductivity contrast at the 410-km discontinuity. We found that if the water content of the mantle does not change with depth, there should be a large (a factor of similar to 10) drop in conductivity from above to below the 410-km discontinuity. In contrast, geophysically inferred electrical conductivity increases at 410-km suggesting the increase in water content from above to below the 410-km discontinuity. The present results are used to compare several previous results obtained at different pressures. It was shown that our results agree well with most of previous studies but not with (Yoshino et al., 2009). Possible causes for this discrepancy are discussed. |
关键词 | Electrical Conductivity Polycrystalline Olivine Pressure Water |
学科领域 | 矿床地球化学 |
收录类别 | SCI |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/352002/5237 |
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 |
推荐引用方式 GB/T 7714 | Lidong Dai,Shun-ichiro Karato. The effect of pressure on the electrical conductivity of olivine under the hydrogen-rich conditions[J]. Physics of the Earth and Planetary Interiors,2014,232(1):51-56. |
APA | Lidong Dai,&Shun-ichiro Karato.(2014).The effect of pressure on the electrical conductivity of olivine under the hydrogen-rich conditions.Physics of the Earth and Planetary Interiors,232(1),51-56. |
MLA | Lidong Dai,et al."The effect of pressure on the electrical conductivity of olivine under the hydrogen-rich conditions".Physics of the Earth and Planetary Interiors 232.1(2014):51-56. |
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