Experimental Conductivity of Partial Melt Granite at High Temperature and Pressure

WANG Shuangjie; YI Li; WANG Duojun; SHEN Kewei; HAN Kenan

doi:10.11858/gywlxb.20200502

Volume 34 Issue 5

Sep 2020

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Chinese Journal of High Pressure Physics > 2020 > 34(5): 051201.

WANG Shuangjie, YI Li, WANG Duojun, SHEN Kewei, HAN Kenan. Experimental Conductivity of Partial Melt Granite at High Temperature and Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 051201. doi: 10.11858/gywlxb.20200502

Citation:

WANG Shuangjie, YI Li, WANG Duojun, SHEN Kewei, HAN Kenan. Experimental Conductivity of Partial Melt Granite at High Temperature and Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 051201. doi: 10.11858/gywlxb.20200502

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Experimental Conductivity of Partial Melt Granite at High Temperature and Pressure

doi: 10.11858/gywlxb.20200502

1.
Institute of Earthquake Forecasting, CEA, Beijing 100036, China
2.
School of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 06 Jan 2020
Rev Recd Date: 18 Feb 2020

Abstract

Abstract

Magnetotelluric (MT) surveys reveal that high conductivity layer appear in the upper crust beneath Tibet. Granite is the main rocks composed of upper crust, playing an important role in the process of crustal evolution. Electrical conductivity of granite during partial melting is of great significance to understanding the conductivity structure of Tibetan Plateau crust and the crustal evolution process. Electrical conductivity of granite collected from the Tibet was conducted under the conditions of 0.5－2.0 GPa and 773－1 373 K. The activation enthalpies of 1.01－1.09 eV and 2.16－2.97 eV are derived from 773 to 1 223 K and from 1 223 to 1 373 K, respectively. The change of activation enthalpy in different temperature zones may be related to the partial melting of granite induced by the biotite dehydration. Combining the experimental results and geothermal gradient of Tibet, we found that the experimental conductivity values fell between 0.016 S/m and 0.310 S/m in the temperature range of 973－1 223 K, which was in good agreement with the magnetotelluric sounding data. This may indicate that there is a close relationship between the genesis of the high conductivity layer and the partial melting of granite.
- high temperature and high pressure,
- conductivity,
- granite,
- partial melting

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References(43)

References

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Experimental Conductivity of Partial Melt Granite at High Temperature and Pressure

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