高温高压下矿物岩石电性和弹性研究的新进展.pdf

324 melting temperature of core materials under extreme conditions using static and dynamic compression techniques. The combined dataset over a wide pressure and temperature range provides tight constraints on the range of core compositions that fit to the geophysical observations. I further examine processes related to the core ation including mantle-core differentiation and liquid metal percolation during core ation to understand the link between the core composition and process lead to the core ation. This integrated approach will yield a maximum amount of data from laboratory simulations, resulting in a more complete understanding of the composition of planetary cores and the core ation process. S14-O-08 高温高压下矿物岩石电性和 弹性研究的新进展 代立东 1, 2, 3*， 李和平1， 胡海英1， Shun-ichiro Karato2 and Kei Hirose3 1 中国科学院地球化学研究所地球内部物质高温高 压实验室，贵阳，贵州 550002 2 Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA; 3 Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan dailidong 原位的高温高压下矿物岩石电导率和弹 性波速是地球科学家探索地球与行星内部物 质组成、结构构造、温度分布、部分熔融、 水含量、氧化还原状态、点缺陷化学、化学 元素迁移、电子自旋态转变等提供极为重要 的信息。 多年以来，中国科学院地球化学研究所 地球内部物质高温高压实验室李和平研究员 课题组一直致力于该方面的研究工作，并取 得重要研究进展。最近，该课题组代立东研 究员等以地壳和上地幔典型矿物岩石富含 铁铝榴石 Alm82Py15Grs3、单晶 San Carlos 橄榄石及花岗岩，及下地幔矿物钙铁酸盐 相 Na0.4Mg0.6Al1.6Si0.4O4 的NAL和CF为例， 在该实验室、美国耶鲁大学地质与地球物理 系及日本东京工业大学地球与行星科学学院， 采用多面顶大压力机和金刚石压腔高温高压 设备，结合世界最大同步光源国家实验室的 日本 SPring-8 和双面 CO2镭射激光加热条件 下，对电导率和布里渊散射弹性波速进行原 位测量，发现压力、氧分压、相转变对矿物 物理学性质有重要影响，该成果可为地球深 部物质的电导率深度和弹性波-深度等剖 面的建立提供重要的实验结果和科学依据。 S14-O-09 KAlSi3O8 Hollandite的振动特 性和热力学性质的第一性原 理计算 Linlin CHANG1, Xi Liu2, Tao SUN1 1 College of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049 2 School of Earth and Space Sciences, Peking University, Beijing, 100875 llchang KAlSi3O8 hollandite is regarded as an important potential reservoir for large lements and incompatible large-ion lithophile elements. Holl-I and Holl-II are polymorphs of KAlSi3O8 stable at low pressures and high pressures, respectively. We use first principle calculations based on density functional theory to study the vibrational and thermodynamic properties of KAlSi3O8 polymorphs. The static transition