Thermal Equations of State of Mantle and Core Materials

地幔和核心材料状态的热方程

• 批准号: 0809539
• 负责人: Yingwei Fei
• 金额: $ 28万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0809539&HistoricalAwards=false
• 关键词: Thermal; Equations; State; Mantle; Core

Seismic waves generated by any substantial earthquake travel through the Earth?s inside, providing information on material properties of the Earth?s interior. In order to understand the seismic observations, we perform laboratory experiments to obtain physical properties of earth materials under high pressure (P) and temperature (T) conditions equivalent to the Earth?s interior. The experimental data are then used to directly compare with the observations and build models of the Earth?s interior. In this proposal, we will measure densities of silicate perovskite and ferropericlase (two dominant phases of the Earth?s lower mantle) and iron-nickel alloy (the main constituent of the Earth?s inner core) at high pressure and temperature, using synchrotron X-ray diffraction techniques. We will use newly developed laser heating and combination of external resistance and laser heating techniques in the diamond anvil cell to simulate conditions of the Earth?s interior. The emphasis of the proposed research is to obtain high-quality data while expanding the experimental P-T range. Using the new data, we can directly evaluate if a peridotitic mantle model is consistent with the observed mantle density profile and constrain the amount of light elements in the inner core. The results will have important implications for mantle convection, core dynamics, and composition models of the Earth?s interior. The project will develop high-pressure techniques that will be available for researchers in broad scientific communities and provide opportunity for young researchers at all levels to gain research experience in high-pressure research. Knowledge obtained from the proposed study will improve our general understanding of the planet Earth, especially, its interior.

任何大地震产生的地震波都能穿过地球吗？的内部，提供有关地球的物质属性的信息？的内部。为了了解地震观测，我们进行实验室实验，以获得地球材料的物理性质，在高压（P）和温度（T）的条件下，相当于地球？的内部。实验数据然后被用来直接与观测数据进行比较，并建立地球模型？的内部。在这个提议中，我们将测量硅酸盐钙钛矿和铁方镁石（地球的两个主要阶段？的下地幔）和铁镍合金（地球的主要成分？的内核）在高压和高温下，使用同步辐射X射线衍射技术。我们将使用新开发的激光加热和外部电阻和激光加热技术相结合的金刚石对顶砧单元，以模拟地球的条件？的内部。该研究的重点是在扩大实验P-T范围的同时获得高质量的数据。利用新的数据，我们可以直接评估一个橄榄岩地幔模型是否与观测到的地幔密度分布一致，并限制内核中轻元素的数量。研究结果将对地幔对流、地核动力学和地球成分模型产生重要影响。的内部。该项目将开发高压技术，供广大科学界的研究人员使用，并为各级青年研究人员提供机会，以获得高压研究方面的研究经验。从拟议的研究中获得的知识将提高我们对地球，特别是其内部的一般了解。