Elasticity of High Pressure Mantle Garnet Phases at High Pressures and High Temperatures

本研究对Mg3Al2Si3O12-pyrope石榴石进行了同时高压和高温下的声波速度（P-Vp-Vs-T测量）和状态方程（P-V-T关系）的精确测量。实验将在安装在布鲁克海文国家同步加速器光源的超导振荡光束线（X17B1）上的立方砧dia型高压装置SAM-85中进行。高压和高温弹性数据以及状态方程数据将与Mg3Al2Si3O12-pyrope石榴石的数据进行比较，这些数据是由其他弹性技术获得的单晶或多晶样品。该研究将利用现有的Mg3Al2Si3O12-pyrope石榴石多晶样品和其他新样品，在2000吨单轴分裂球装置（USSA-2000）中，在高达5 GPa和1350℃的条件下热压。样品将通过x射线衍射、光学、扫描和透射电子显微镜以及台式超声技术进行表征，以确保样品是单相、细粒、无孔隙和裂纹的。

Gwanmesia 0106528 The study is to make precise measurement of the acoustic wave velocities at simultaneous high-pressures and temperatures (P-Vp-Vs-T measurements) and the equation of state (P-V-T relations) for Mg3Al2Si3O12-pyrope garnet. The experiments will be conducted in a cubic anvil DIA-type high pressure apparatus, SAM-85, which is installed on the super conducting wiggler beam line (X17B1) at the National Synchrotron Light Source of the Brookhaven National laboratory. The high pressure and high temperature elasticity data, as well as the equation of state data, will be compared with data for Mg3Al2Si3O12-pyrope garnet obtained by other elasticity techniques using single-crystal or polycrystalline specimens. The study will utilize existing polycrystalline specimens of Mg3Al2Si3O12-pyrope garnet and other new specimens hot-pressed in a 2000-ton uniaxial split-sphere apparatus (USSA-2000) at conditions up to 5 GPa, and 1350C. Samples will be characterized by x-ray diffraction, optical, scanning and transmission electron microscopy and by bench top ultrasonic techniques, to ensure that the specimens are singled-phase, fine-grained and pore- and crack-free.