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: 0309486
• 负责人: Dion Heinz
• 金额: $ 25万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0309486&HistoricalAwards=false
• 关键词: Experimental; Determination; Thermal; Equations; State

EAR-0309486The equations of state of several constituents of the lower mantle and core will be determined at high pressures and temperatures. The compounds to be studied include (Fe,Ni) alloy, the (Mg,Fe)O series, (Mg,Fe)SiO3-perovskite, Fe3C, and FeS. Unit cell volumes and other crystallographic information are to be obtained using synchrotron x-ray diffraction while the samples are compressed and laser-heated in a diamond anvil cell. Subsolidus phase transitions will be detected and identified during the course of the equation of state measurements. Internal standards will be used for pressure calibration. The experimental methodology for these experiments has been proven successful at the Advanced Photon Source, Argonne National Laboratory. The data to be collected are critical not only to understand the seismological data, which show variations in density and elasticity within the Earth, but also for developing models of chemical evolution of the Earth. Results from the proposed study will be disseminated primarily through publication in the scientific literature, by participation at scientific conferences, and when warranted, through wider-reaching news outlets. Additional benefits of the proposed research include the continued development and refinement of experimental high-pressure, high-temperature techniques; continued exposure of university researchers, including student participants, to the facilities and talent at government-funded multi-user sites; and the training of students in the wide range of experimental techniques and scientific protocols associated with performing the proposed work.

下地幔和地核的几种成分的状态方程将在高压和高温下确定。待研究的化合物包括（Fe，Ni）合金、（Mg，Fe）O系列、（Mg，Fe）SiO 3-钙钛矿、Fe 3C和FeS。晶胞体积和其他晶体学信息将使用同步加速器X射线衍射获得，同时样品在金刚石砧座单元中压缩和激光加热。在状态方程测量过程中，将检测和识别固相线下相变。内标物将用于压力校准。这些实验的实验方法已被证明是成功的，在先进的光子源，阿贡国家实验室。收集的数据不仅对了解地震数据至关重要，因为地震数据显示了地球内部密度和弹性的变化，而且对建立地球化学演变模型也至关重要。 拟议研究的结果将主要通过在科学文献中发表、参加科学会议以及在必要时通过影响更广的新闻媒体进行传播。拟议研究的其他好处包括：继续开发和改进实验高压，高温技术;大学研究人员，包括学生参与者，继续接触政府资助的多用户站点的设施和人才;以及在与执行拟议工作相关的广泛实验技术和科学协议方面对学生进行培训。