Theoretical Investigations of Mantle Materials

9870328科恩理论方法将用于研究地幔相的性质，以更好地了解地球地幔的物理性质，并指导实验研究。 将处理的重要问题包括研究过渡金属离子如亚铁和三价铁离子和微量元素如Co、Ni和Mn在镁橄榄石和钙钛矿等下地幔矿物中的行为;设计和解释高压矿物的X射线光谱实验，以了解它们在地幔高压下的电子特性;钙钛矿和镁橄榄石在高压和高温下的扩散和流变学;钙钛矿和镁橄榄石的高压高温弹性;高压熔融;以及高压下稀有气体在氧化物熔体和固体中的溶解度。 这项工作将为地球物理学和地球化学提供重要的预测，有助于理解地球和类地行星的演化和动力学。 它将在地球深部高压和高温的实验困难的情况下预测矿物的性质，并将增加我们对矿物行为实验观察的理解。

9870328CohenTheoretical methods will be used to study properties of mantle phases to better understand the physical properties of the Earths mantle and to guide experimental studies. Important problems that will be addressed include study of the behavior of transition metal ions such as ferrous and ferric iron and minor elements such as Co, Ni, and Mn in lower mantle minerals such as magnesiowustite and perovskite; design and interpretation of x-ray spectroscopic experiments on high pressure minerals to understand their electronic properties at high pressures in the Earth's mantle; diffusion and rheology of perovskite and magnesiowustite at high pressures and temperatures; high-pressure high-temperature elasticity of perovskite and magnesiowustite; high pressure melting; and solubility of rare gases in oxide melts and solids at high pressures. This work will give important predictions for geophysics and geochemistry that will aid understanding of the evolution and dynamics of the Earth and terrestrial planets. It will give predictions of mineral properties in the experimentally difficult regime of the high pressures and temperatures of the deep Earth and will increase our understanding of experimental observations of mineral behavior.