Collaborative Research: Elasticity Grand Challenge of the COMPRES Initiative

合作研究：COMRES 计划的弹性大挑战

• 批准号: 0135642
• 负责人: Jay Bass
• 金额: $ 84.51万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0135642&HistoricalAwards=false
• 关键词: Collaborative; Research; Elasticity; Grand; Challenge

Bass0135642Elasticity measurements on minerals are the bridge between the observed seismic velocity structure of the Earth and properties of the Earth at depth, such as chemical composition and temperature. The mineral physics community is poised to undertake a new generation of experiments, which will allow us to accurately determine the properties of deep-Earth materials under a new regime of pressure and temperature (P-T) conditions. We will undertake a coordinated, multi-institutional effort to develop advanced experimental and theoretical techniques for determining sound velocities and elastic moduli on Earth materials. We will build on the current technology that utilizes light scattering and ultrasonic methods and exploit the full use of synchrotron radiation facilities for simultaneous characterization. We will pursue new methodologies utilizing inelastic x-ray scattering or gigahertz ultrasonics to expand the current capabilities. We will closely integrate theoretical approaches with the experimental to ground-truth both. Using multiple techniques, including theoretical calculations, we will focus our efforts on determining the elastic properties of olivine and its high-pressure polymorphs under high P-T conditions, and standard materials for high P-T calibrations (e.g., Pt, Au, MgO, NACI). Samples will be synthesized at a central community facility. The accuracy of each technique will be improved through inter-laboratory cross-checks and comparison with theory. This collaborative approach will greatly advance the technology of high pressure geophysics, and focus a community effort on accurate determination of the elastic properties of the most important mantle phases. These results will, in turn, be used to clarify our view of mantle composition and thermal structure.

Bass0135642矿物质上的弹性测量是观察到的地球速度结构与地球深度的地震速度结构之间的桥梁，例如化学成分和温度。 矿物质界有望进行新一代的实验，这将使我们能够准确确定在新的压力和温度（P-T）条件下，深地球材料的性质。 我们将进行协调的多机构努力，以开发先进的实验和理论技术，以确定地球材料上的声速和弹性模量。 我们将基于当前利用光散射和超声波方法的技术，并利用同步辐射设施的完全使用来同时表征。 我们将利用非弹性X射线散射或Gigahertz Ultrasonics进行新的方法来扩大当前功能。 我们将将理论方法与实验构成基础真相密切相结合。 使用多种技术，包括理论计算，我们将重点放在确定橄榄石及其在高P-T条件下的高压多晶型物的弹性特性，以及用于高P-T校准的标准材料（例如，PT，AU，AU，AU，MGO，MGO，NACI）。 样品将在中央社区设施合成。 每种技术的准确性将通过实验室间交叉检查并与理论进行比较来提高。 这种协作方法将大大推动高压地球物理学的技术，并将社区努力集中在准确确定最重要的地幔阶段的弹性特性上。 这些结果将依次用于阐明我们对地幔组成和热结构的看法。