Experimental Determination of the Thermal Equations of State of Mantle and Core Materials

地幔和核心材料状态热方程的实验测定

• 批准号: 9974373
• 负责人: Dion Heinz
• 金额: $ 27万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9974373&HistoricalAwards=false
• 关键词: Experimental; Determination; Thermal; Equations; State

9974373 Heinz Recent advances in synchrotrons, diamond anvil cell design and laser heating techniques have opened up a new window of opportunity for the study of minerals at high pressures and simultaneous high temperatures. Using laser heating of diamond anvil cell samples and synchrotron radiation, the thermal equations of state of (Mg,Fe)SiO3 in the perovskite structure, (Mg,Fe)O, SiO2, Fe, Ni and FeS will be measured under the pressure and temperature conditions of the lower mantle and outermost core. These measurements will constrain the thermal expansion of these materials at high pressures and temperatures well above the Debye temperatures of the materials. The temperature and pressure derivatives of the bulk modulus will also be determined at high pressures and temperatures. The above data will allow thermal equations of state of mantle and core materials to be constructed for use in comparing laboratory data with the seismically observed properties of the Earth's mantle and core. This type of comparison will aid us in understanding the thermal structure of the Earth's mantle and core, the composition of the Earth's lower mantle, and whether or not the Earth's mantle is chemically layered.

9974373海因茨同步加速器、金刚石对顶砧室设计和激光加热技术的最新进展为在高压和同时高温下研究矿物开辟了一个新的机会之窗。利用激光加热金刚石对顶砧样品和同步辐射，在下地幔和地核最外层的压力和温度条件下，测量钙钛矿结构中（Mg，Fe）SiO3、（Mg，Fe）O、SiO2、Fe、Ni和FeS的热状态方程。 这些测量将限制这些材料在高压和远高于材料的德拜温度的温度下的热膨胀。 体积模量的温度和压力导数也将在高压和高温下测定。上述数据将使地幔和地核物质的热状态方程得以建立，用于将实验室数据与地球地幔和地核的地震观测特性进行比较。 这种类型的比较将有助于我们了解地球地幔和地核的热结构，地球下地幔的组成，以及地球地幔是否是化学分层的。