Experimental Investigation of Upper Mantle Processes to 9GPa: Initial Application of the Extended Range Piston Cylinder

对活塞-气缸装置进行了全面的重新设计，使PI的压力至少达到8gpa。新的能力将在三个领域的实验中得到利用：Mg2SiO4 - Fe2SiO4体系的精确相图2。据预测，硅和A1在硅酸盐液体中的位置环境随压力的变化而变化。增程活塞缸能够达到预测发生这些变化的压力，并且运行产品可以通过MASS NMR进行分析。这将大大提高我们对岩浆粘度和密度的理解。3. 将在适当的压力范围内校正两个知名的地球气压计。所有这些研究将增强我们对地幔环境和岩浆如何在地幔中产生的理解。

A comprehensive redesign of the piston-cylinder apparatus has enabled the PI to reach pressures of at least 8 GPa. The new capabilities will be exploited by experiments in three areas: 1. An accurate phase diagram in the Mg2SiO4 - Fe2SiO4 system 2. It has been predicted that the site environment of Si and A1 in silicate liquids changes as a function of pressure. The extended range piston cylinder is capable of reaching the pressures at which these changes have been predicted to occur, and run products can be analyzed by MASS NMR. This should greatly improve our understanding of magma visosities and densities. 3. Calibration of two well-known geobarometers will be carried out in the appropriate pressure range. All of these studies will enhance our understanding of the environment in the mantle and of how magma is generated in the mantle.