The High Pressure Structure of Silicate Liquids: Constraints on the Chemical and Physical Properties of Deep Earth Melts

该项目涉及收集结构信息 硅酸盐类液体的电输运性质 在高压和高温下以及玻璃的结构上 在高压和高温下形成， 温度 主要结构探针是振动的 光谱学：主要是液体的拉曼光谱学，以及 红外光谱或淬火玻璃保持在原位在高 压力 计划是利用外部加热的钻石 细胞产生的压力和温度， 液体的电导率实验，以及激光加热耦合 与金刚石压砧单元一起形成高压玻璃。 等 数据对于预测和评估变化至关重要 在物理性质，如密度和粘度， 岩浆液体在压缩，并承担基本上对 地球演化到现在的过程 状态 目标是为以下方面的变革提供结构基础： 的地球化学、热力学和输运性质， 硅酸盐在高压下熔化。 这些实验已经 由于最近在这一代和 校准钻石内部的高压和高温 砧单元，以及固态探测器技术的进步。

This project involves collecting information on the structure and electrical transport properties of silicates-analogue liquids at high pressures and temperatures and on the structures of glasses formed at high pressures and temperatures and quenched only in temperature. The primary structural probes are vibrational spectroscopy: principally Raman spectroscopy for the liquids, and infrared spectroscopy or quenched glasses held in situ at high pressures. The plan is to utilize the externally heated diamond cell to generate pressure and temperature for both spectroscopic and conductivity experiments on liquids, and laser heating coupled with the diamond anvil cell to form high pressure glasses. Such data are critically important in predicting and evaluating changes in the physical properties, such as density and viscosity, of magmatic liquids under compression, and bear fundamentally on the processes by which the Earth has differentiated to its present state. The goals is to provide a structural basis for changes in the geochemical, thermodynamics, and transport properties of silicate melts at high pressures. These experiments have been rendered feasible by recent advancements in both the generation and calibration of high pressures and temperatures within the diamond anvil cell, as well as advances in solid-state detector technology.