U.S.-France Cooperative Research: High Temperature Spectroscopic Studies of Silicates and of Trace Elements

这个为期三年的奖项支持斯坦福大学的Gordon Brown和Jonathan Stebbins以及巴黎第六和第七大学的George Calas和Francis Taulelle在地幔地球化学方面的美法合作研究。他们将研究高温高压下的硅酸盐液体和硅酸盐矿物中的微量元素。Drs。布朗和卡拉斯为这次合作带来了他们在同步加速器x射线吸收方面的创新方法。这是由Stebbins和Taulelle在高温高压核磁共振（核磁共振）光谱方面的工作补充的。该项目将受益于斯坦福大学和巴黎的先进设施。该项目将提供关于模拟上地幔条件下硅酸盐液体（熔体）结合和硅酸盐矿物中过渡金属的结构作用的新信息。这些结果将促进我们对这些硅酸盐液体在高温高压下的结构-性质关系的理解。详细了解这些液体的结构-性质关系和熔化阶段，对于理解地球和其他行星的动态过程、结构和成分分区至关重要。

This three-year award supports U.S.-France cooperative research in mantle geochemistry between Gordon Brown and Jonathan Stebbins of Stanford University and George Calas and Francis Taulelle of the University of Paris VI and VII respectively. They will study silicate liquids at high temperatures and pressures and trace elements in silicate minerals. Drs. Brown and Calas bring to this collaboration their innovative methods in synchrotron based X-ray absorption. This is complemented by Stebbins and Taulelle's work in high temperature and pressure NMR (Nuclear Magnetic Resonance) spectroscopy. The project will benefit from access to advanced facilities at Stanford and in Paris. The project will provide new information on the bonding of silicate liquids (melts) under simulated upper mantle conditions and the structural role of transition metals in silicate minerals. The results will advance our understanding of the structure- property relationships of these silicate liquids at high temperatures and pressures. Detailed knowledge of the structure-property relationships of these liquids and the melting phase, will be vital for understanding the dynamic processes, structure and compositional zoning within the Earth and other planets.