Thermal Histories of Igneous and Metamorphic Rocks

PI在地质物质同位素扩散方面做了开创性的工作。他建议利用扩散速率的知识，结合Sr和O同位素组成的测量，来确定用其他方法研究过的岩石单元的冷却历史。一个关键的目标是比较基于两个地区同位素系统的结果。其基本概念是测定具有不同Sr同位素闭合温度的各种矿物的年代，以获得冷却曲线。然后比较预测和观测到的O同位素组成将为冷却模型提供一个独立的测试。这项工作具有创新性，在理解火成岩和变质岩的扩散过程和热史方面具有很大的潜力。

The PI has done pioneering work on isotope diffusion in geologic materials. He proposes to use knowledge of diffusion rates combined with measurements of Sr and O isotopic compositions to determine the cooling histories of rock units that have been studied by other means. A key goal is to compare results based on the two district isotopic systems. The basic concept is to date a variety of minerals having different temperatures of Sr isotopic closure to obtain cooling curves. Then comparison predicted vs. observed O isotopic compositions will provide an independent test of the cooling model. This work is innovative and has high potential for understanding diffusion processes and thermal histories of igneous and metamorphic rocks.