Electrical conductivity of hydrous natural basalts at high temperatures and pressures

	Electrical conductivity of hydrous natural basalts at high temperatures and pressures
	Lidong Dai; Jian-jun Jiang; Heping Li; Haiying Hu; Keshi Hui
	2015
发表期刊	Journal of Applied Geophysics
卷号	112 290-297 期号:1 页码:290-297
摘要	The electrical conductivities of natural iron-bearing basalts, with a water content ranging from 0.62 to 4.19 wt.%, were determined for a range of pressure (0.5-2.0 GPa) and temperature (823-1173 K) conditions. A Ni-NiO solid oxygen buffer was selected to stabilize the oxygen partial pressure. Increasing pressure causes the electrical conductivity of the hydrous sample to slightly decrease, whereas the activation enthalpy increases. The activation energy and activation volume are 0.86 +/- 0.14 eV and 1.43 +/- 025 cm(3)/mol, respectively. At a constant pressure of 2.0 GPa, the electrical conductivity increases with increasing water content. Considering the dependence of activation enthalpy on water content for all samples at 2.0 GPa, the electrical conductivity data were fitted to the formula sigma = (A(1) +A(2) * C-w(gamma)) * exp (-Delta H-0-alpha C-w(beta)/RT), where A(1) and A(2) is the pre-exponential factor, C-w is the water content in sample, Delta H-0 is the activation enthalpy at very low water concentrations, T is the absolute temperature, k is the Boltzmann constant, and r, alpha and beta are constants. Furthermore, the electrical conductivity of natural hydrous basalts cannot account for the crustal high-conductivity anomaly observed in magnetotelluric results observed in the North China Craton, Axial Volcanic Ridge, and Transverse Electric models.
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/352002/5995
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,Jian-jun Jiang,Heping Li,et al. Electrical conductivity of hydrous natural basalts at high temperatures and pressures[J]. Journal of Applied Geophysics,2015,112 290-297(1):290-297.
APA	Lidong Dai,Jian-jun Jiang,Heping Li,Haiying Hu,&Keshi Hui.(2015).Electrical conductivity of hydrous natural basalts at high temperatures and pressures.Journal of Applied Geophysics,112 290-297(1),290-297.
MLA	Lidong Dai,et al."Electrical conductivity of hydrous natural basalts at high temperatures and pressures".Journal of Applied Geophysics 112 290-297.1(2015):290-297.

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