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

高压高温下高压地幔石榴石相的弹性

• 批准号: 0106528
• 负责人: Gabriel Gwanmesia
• 金额: $ 6.31万
• 依托单位: Delaware State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106528&HistoricalAwards=false
• 关键词: Elasticity; Pressure; Mantle; Garnet; Phases

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.

本研究旨在对Mg_3Al_2Si_3O_（12）-镁铝榴石石榴石在高温高压下的声速（P-Vp-Vs-T测量）和状态方程（P-V-T关系）进行精确测量。实验将在一个立方体砧DIA型高压装置SAM-85中进行，该装置安装在布鲁克海文国家实验室国家同步加速器光源的超导摇摆器光束线（X17 B1）上。高压和高温的弹性数据，以及状态方程的数据，将与其他弹性技术，使用单晶或多晶试样获得的Mg3 Al 2Si 3 O 12-镁铝榴石石榴石的数据进行比较。这项研究将利用现有的Mg3 Al 2Si 3 O 12-镁铝榴石石榴石多晶样品和其他新样品热压在一个2000吨的单轴分裂球装置（USSA-2000）的条件高达5 GPa，和1350 C。 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波技术对样品进行表征，以确保样品为单相、细晶粒且无孔隙和裂纹。