Physical Properties at High Pressure and Temperature: Implications for Mantle Stratification and Dynamics

了解高压和高温特性 矿物的关键物理性质是一种基本成分， 在继续努力了解地球内部的对流 地幔 由于我们目前的大部分认识仍然是基于 硅酸盐的假定和外推弹性和热性质 矿物，仍然很难确定是否径向 地幔的地震模型暗示了化学分层。 的 PI已经建立了一个实验室，用于测量高 候选人关键物理特性的压力和温度 地幔成分 激光感生声子谱已经被 结合金刚石压砧技术， 矿物在高压下的热扩散系数。 橄榄石的结果，以7 GPa最近有报道。 将对各种矿物的这种测量扩展到 过渡带和下地幔压力区（12至25 GPA）是 这是目前工作的主要目标。 处的测量 将尝试同时高温和高压。

Knowledge of the high pressure and high temperature behavior of key physical properties of minerals is an essential ingredient in the continuing effort to understand convection within Earth's mantle. Since much of our current understanding is still based on assumed and extrapolated elastic and thermal properties of silicate minerals, it remains difficult to determine whether or not radial seismic models for the mantle imply chemical stratification. The PI has constructed a laboratory for the measurement at high pressure and temperature of key physical properties of candidate mantle constituents. Laser-Induced Phonon Spectroscopy has been coupled with diamond anvil cell technology to measure elastic constants and thermal diffusivity of minerals at high pressure. Results for olivine to 7 GPa have recently been reported. Extension of such measurements on a variety of minerals to a transition zone and lower mantle pressure regime (12 to 25 GPA) is a principle goals of the present work. Measurements at simultaneous high temperature and pressure will be attempted.