Kinetic Studies of Geological Processes

这项研究的主要目标是了解控制矿物中扩散的机制和控制参数，特别是阳离子的扩散。重点将继续放在长石上，以便建立一个系统和足够全面的数据体系。这些数据将构成阳离子预测模型的基础，包括那些尚未研究的阳离子。拟开展的研究包括确定长石中阳离子的扩散机制及其控制因素，建立预测扩散动力学行为的理论基础，继续测量铅在独居石中的扩散并将其扩展到其他矿物，如钛矿和金红石，并将锶扩散动力学的测定扩展到云母、磷灰石和钛矿。后两项研究对于精确定义地质年代学上重要的系统的扩散行为，以便对数据作出现实的解释，尤其重要。大部分分析数据将由离子探针测定。

9418437 Giletti A principal goal of this research is to understand the mechanisms and controlling parameters that govern diffusion in minerals, particularly by cations. The focus will continue to be the feldspars, in order to develop a systematic and sufficiently comprehensive body of data. These data will form the basis for a predictive model for cations, including those not studied. The proposed research will include determining the diffusion mechanisms and their controlling factors for cations in feldspars, developing a theoretical basis for predicting diffusion kinetics behavior, continuing to measure the Pb diffusion in monazite and extend it to other minerals such as titanite and rutile, and extending determination of Sr diffusion kinetics to mica, apatite and titanite. The two latter studies are especially important in defining precisely the diffusion behavior of geochronologically important systems so that realistic interpretations of th edata can be made. Most of the analytical data will be determined by ion microprobe.