Elastic constants of crustal minerals and their temperature dependence

A method for resonant ultrasound spectroscopy was constructed, which enables us to obtain elastic constants and their temperature derivatives of crustal minerals. Measurements were conducted on crystals of a chromian spinel and a garnet. At room temperature, elastic constants C11, C12 and C44 of garnet are determined to be 296.0, 111.2, 94.4 （GPa), respectively. The temperature derivatives are respectively -0.033, -0.014 and -0.011 （GPa/K). The method can be applied to study elastic properties of crustal minerals.