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Simultaneous ultrasonic elastic wave velocity and in situ synchrotron X-ray measurements on grossular garnet were carried out up to 17 GPa and 1 650 K. P-and S-wave velocities and bulk and shear modulus showed linear pressure and temperature dependence. These data yielded a pressure derivative of the bulk modulus of 4.42(7) and a shear modulus of 1.27(3), which are in good agreement with those of garnets with variable chemical compositions. Temperature dependence of the bulk modulus of grossular (-1.36×10-2 GPa/K) is also similar to that of other garnets, while the temperature dependence of the shear modulus of grossular (-1.11×10-2 GPa/K) is higher than those of magnesium end-member garnets and pyrolitic garnet.
Simultaneous ultrasonic elastic wave velocity and in situ synchrotron X-ray measurements on gross garnet were carried out up to 17 GPa and 1 650 K. P-and S-wave velocities and bulk and shear modulus showed linear pressure and temperature dependence. These data yielded a pressure derivative of the bulk modulus of 4.42 (7) and a shear modulus of 1.27 (3), which are in good agreement with those of garnets with variable chemical compositions. Temperature dependence of the bulk modulus of grossular (-1.36 × 10- 2 GPa / K) is also similar to that of other garnets, while the temperature dependence of the shear modulus of grossular (-1.11 × 10 -2 GPa / K) is higher than those of magnesium end-member garnets and pyrolitic garnet.