Thermodynamic properties of San Carlos olivine at high temperature and high pressure

• 作者: Chang Su Yonggang Liu Wei Song Dawei Fan Zhigang Wang Hongfeng Tang
• 学科: 地球科学
• 关键词: San Carlos olivine Thermodynamic property Thermal expansion Heat capacity Temperature gradient
• 年，卷（期）: 2022,（2）
• 页码范围: 171-179
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s11631-018-0261-z

摘要

In this study, the thermal expansion and heat capacity of San Carlos olivine under high temperature and high pressure are reported. Combining accurate sound velocity data under different P-T conditions with density and heat capacity data at ambient pressure, the density, adiabatic bulk modulus, shear modulus, and most importantly, thermal expansion and heat capacity, of San Carlos are extracted to 14 GPa by a numerical procedure using classic thermodynamic relationships. These data are in agreement with published findings. To estimate the temperature gradient in the upper mantle, we also report the fitting equations of thermal expansion and heat capacity of San Carlos olivine as a function of both temperature and pressure to the P-T condition of the 410 km discontinuity, which provide the thermodynamic properties with increasing depth in the Earth's interior.