CHEN Gang1,2, LI He-Ping1, MIAO She-Qiang3
(1. K ey Laboratory for 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;
3. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China)
Abstract: Albite is one of the most important minerals in the Earth’s crust. Knowledge of its heat-transport properties under the condition of high temperature and high pressure is essential for understanding thermal regimes in the crust. In this study， high pressure experimental apparatus was built on the pulse heating method, and thermal diffusivities of albite aggregates at 0.5 GPa, 1.0 GPa, 2.0 GPa and 373~973 K were measured. Pressure coefficients of thermal diffusivity for albite at different temperatures were 4.8%～9.2%/GPa, which were much higher than other common silicates of 4%. In the environment of the crust, pressure effects can promote the thermal conductivity of albite 17% higher than ambient pressure, so when calculating the thermal structure of the crust, the effects of pressure need to be considered.
Keywords: albite; thermal diffusivity; high pressure and high temperature; transient plane source method
Email: miaosheqiang@126.com
ACTA MINERALOGICA SINICA Vol. 36, No. 1, 2016, Page 7-11
