Strength and Elasticity of Mantle Minerals by Radial X-Ray Diffraction and Brillouin Spectroscopy

通过径向 X 射线衍射和布里渊光谱研究地幔矿物的强度和弹性

• 批准号: 0125675
• 负责人: Thomas Duffy
• 金额: $ 21.62万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2004-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0125675&HistoricalAwards=false
• 关键词: Strength; Elasticity; Mantle; Minerals; Radial

DuffyEAR-0125675In this project, the investigators will study rheological and elastic properties of mantle minerals by combining new radial x-ray diffraction techniques with Brillouin spectroscopy in a diamond anvil cell. Radial x-ray diffraction is a new high-pressure method that can constrain a wealth of information about single-crystal elastic constants, yield strength, strength anisotropy, stress continuity, texturing, and even the equation of state. Advantages of radial diffraction relative to other techniques for strength and elasticity determination are that the accessible pressure range reaches into the deep lower mantle and there is no requirement for high-quality single crystals. A major goal of this study is to explore the capabilities of radial x-ray diffraction by choosing a set of materials for which the investigators can simultaneously apply radial diffraction to 60 GPa and Brillouin scattering on single crystals to 20 GPa. This will provide a direct comparison of elasticity determined by the new lattice strain methods with well-established Brillouin techniques. Specific materials to be examined included perovskites, magnesiowustites, spinel, corundum, brucite, and calcium oxide. These results will have fundamental and wide applications to high-pressure studies and our understanding of the Earth's deep mantle.

Duffyoung-0125675在该项目中，研究人员将通过在金刚石压砧室中将新的径向X射线衍射技术与布里渊光谱学相结合来研究地幔矿物的流变学和弹性特性。径向X射线衍射是一种新的高压方法，可以限制有关单晶弹性常数，屈服强度，强度各向异性，应力连续性，织构，甚至状态方程的丰富信息。相对于其他测定强度和弹性的技术，径向衍射的优点是，可达到的压力范围可以达到下地幔深处，并且不需要高质量的单晶。本研究的一个主要目标是通过选择一组材料来探索径向X射线衍射的能力，研究人员可以同时将径向衍射应用于60 GPa和单晶上的布里渊散射应用于20 GPa。这将提供一个直接比较的弹性确定的新的晶格应变方法与完善的布里渊技术。具体的材料进行检查，包括钙钛矿，镁橄榄石，尖晶石，尖晶石，水镁石，和氧化钙。这些结果将对高压研究和我们对地球深层地幔的了解具有基础性和广泛的应用。