¹Kenan Han,¹Duojun Wang,¹Ruixin Zhang,¹Peng Chen,¹Nao Cai,¹Rui Zhang,¹Yang Cao
Journal Geophysical Research (Planets) (in Press) Link to Article [https://doi.org/10.1029/2022JE007692]
¹High Pressure Science Center, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
Published ba arrangement with John Wiley & Sons

Thermal conductivity (κ) and thermal diffusivity (D) of tremolite were measured at up to 2.5 GPa and 1373 K using the transient plane-source method in a multi-anvil apparatus. Thermal conductivity and thermal diffusivity of tremolite decrease monotonically before dehydration (<1173) and increase significantly after dehydration. Tremolite exhibits a positive pressure dependence before dehydration. Heat capacity (C) of tremolite calculated from κ and D shows a positive pressure dependence, and is controlled by an almost constant thermal expansion coefficient (α) with temperature. Conductive heat transfer and radiative heat transport dominate the heat transport process before dehydration, and the significant increase in thermal conductivity after dehydration is attributed to convective heat transfer. A compositional model of the Venusian lithosphere composed of a basaltic crust and peridotite mantle with or without tremolite was established. The thickness of the Venusian lithosphere with or without tremolite for Venus was calculated by combining the heat flow (from 20 to 80 mW/m2) at a certain depth (from 5 to 25 km) of crust, ranging from 24.4 to 184.6 km.