Rates of metamorphic processes - correlating U-Pb ages with the pressure-temperature conditions of mineral growth

变质过程的速率--将U-Pb年龄与矿物生长的压力-温度条件相关联。为了确定变质过程的速度，从副含铀矿物获得的年龄将与从主要造岩矿物获得的压力和温度相关联。我将开发一种新的创新技术，利用微量元素地球化学来提供这种联系。在天然样品和活塞柱实验中研究了微量元素在可定年矿物（锆石、独居石和钛铁矿）和关键变质矿物之间的分配。我将把这种技术应用于研究俯冲带榴辉岩的折返和下地壳岩石麻粒岩相变质作用的持续时间等过程。

Rates of metamorphic processes - correlating U-Pb ages with the pressure-temperature conditions of mineral growth. To determine the speed of metamorphic processes, the age obtained from accessory uranium-bearing minerals will be correlated to pressure and temperature obtained from major rock forming minerals. I will develop a new and innovative technique that uses trace element geochemistry to provide this link. The trace element partitioning between datable minerals (zircon, monazite and titanite) and key metamorphic minerals will be investigated in natural samples and in piston cylinder experiments. I will apply this technique to the study of processes such as the exhumation of eclogites in subduction zones and the duration of granulite-facies metamorphism in lower crustal rocks.