Thermal Equations of State of Mantle and Core Materials

大地震产生的地震波会穿过地球吗？它提供了关于地球物质特性的信息。室内。为了理解地震观测，我们进行了实验室实验，以获得在相当于地球的高压(P)和温度(T)条件下土材料的物理性质。室内。然后，实验数据被用来直接与观测结果进行比较，并建立地球模型。室内。在这个提议中，我们将测量硅酸盐钙钛矿和铁长石（地球上的两个主要相）的密度。地球的下地幔)和铁镍合金（地球的主要成分）。在高压和高温下，使用同步加速器x射线衍射技术。我们将采用新开发的激光加热和外电阻与激光加热相结合的技术在金刚石砧细胞中模拟地球的条件？室内。本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。利用这些新数据，我们可以直接评估橄榄岩地幔模型是否与观测到的地幔密度剖面相一致，并约束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。室内。该项目将开发高压技术，供广泛科学界的研究人员使用，并为各级年轻研究人员提供获得高压研究经验的机会。从拟议的研究中获得的知识将提高我们对地球的总体认识，特别是对地球内部的认识。

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.