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Thermal Diffusivity of Lherzolite at High Pressures and High Temperatures Using Pulse Method

  • Sheqiang Miao
  • Yongsheng Zhou
  • Heping Li
Article
  • 3 Downloads

Abstract

Lherzolite is one of the most important components of the subcontinental mantle lithosphere, and the study of its heat transfer properties aids in understanding the thermal structure of the continental mantle lithosphere. Currently, few studies have examined the heat transfer properties of lherzolite, and the experimental results remain controversial. This experiment utilized a pulse method to measure the thermal diffusivity of lherzolite at pressures ranging from 1.0 to 4.0 GPa and temperatures from 300 to 1 073 K on a cubic press apparatus. We obtained a thermal diffusivity for lherzolite of approximately 2.10 mm2s-1 at ambient condition. The experimental pressure derivative of the thermal conductivity of lherzolite decreased with temperature, reaching approximately 10% at high temperature, a value higher than the previously reported 4%, which indicates that the temperature gradient of the upper mantle lithosphere is smaller than previously thought. Therefore, concerning calculation of the lithosphere thickness using the thermal conductivity of the lherzolite, the previous calculation using pressure derivative of the thermal conductivity of 4% may cause an underestimation of the upper mantle lithosphere thickness by approximately 6% in a first approximation.

Key words

thermal diffusivity lherzolite pulse method pressure derivative 

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Notes

Acknowledgements

This study was sponsored by the National Natural Science Foundation of China (No. 41504072), the “135” Program of Institute of Geochemistry, Chinese Academy of Sciences (CAS) and State Key Laboratory of Earthquake Dynamics (No. LED2015A04). Two anonymous reviewers are greatly appreciated for improving the manuscript. The final publication is available at Springer via https://doi.org/10.1007/s12583-018-0868-3.

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Copyright information

© China University of Geosciences and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Earthquake Dynamics, Institute of geologyChina Earthquake AdministrationBeijingChina
  2. 2.CAS Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of GeochemistryChinese Academy of SciencesGuiyangChina

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