Petrological, Geochemical, and Geophysical Applications of Transmission Electron Microscopy

这项工作将应用透射电子显微镜、分析和衍射来解决岩石学、地球化学和地球物理的几个重要问题。造岩矿物可能含有亚微观包裹体，这些包裹体含有微量元素和微量元素，这对部分熔融等过程可能很重要。将确定这种夹杂物是否在熔化之前溶解，以及溶解过程的动力学。将继续进行矿物相变的现场研究。透射电镜、扫描电镜和电子探针分析相结合，将用于详细检查瑞士阿尔卑斯中部页岩低变质作用期间发生的反应和流体流动机制。阿伯特湖是干旱环境下的一个碱性盐湖，其风化机制产生的碎屑输入将被确定。分析了成岩作用过程中湖泊沉积物粘土的矿物学和化学变化。这些变化已被证明控制着湖水的地球化学。

This work will apply transmission electron microscopy, analysis, and diffraction to several problems of petrological, geochemical, and geophysical importance. Rock-forming minerals can contain populations of submicroscopic inclusions that contain trace and minor elements, which may be significant for processes such as partial melting. It will be determined whether such inclusion dissolve prior to melting and the kinetics of the dissolution process. In situ studies of phase transformations in minerals will be continued. A combination of TEM, SEM, and electron microprobe analysis will be used to examine in detail the reactions and fluid flow regimes that occur during low-grade metamorphism of shale in the central Swiss Alps. Mechanisms of weathering that produce the detrital input for Abert Lake, an alkaline, saline lake in an arid environment, will be determined. The mineralogical and chemical changes occurring in the clays of the lake sediments during diagenesis will be analyzed. These changes have been shown to control the geochemistry of the lake waters.