Petrological, Geochemical, and Geophysical Applications of Transmission Electron Microscopy

这项工作将把透射电子显微镜、分析和衍射应用到岩石学、地球化学和地球物理的几个重要问题上。造岩矿物可以含有大量的亚显微包裹体，其中含有微量和微量元素，这可能对部分熔融等过程具有重要意义。将确定这种包裹体是否在熔化前溶解，以及溶解过程的动力学。将继续对矿物中的相变进行现场研究。结合电子显微镜、扫描电子显微镜和电子探针分析，将详细研究瑞士阿尔卑斯山中部页岩低级变质过程中发生的反应和流体流动状况。将确定为阿伯特湖产生碎屑输入的风化机制，阿伯特湖是一个干旱环境中的碱性盐湖。将分析成岩作用期间湖泊沉积物粘土中发生的矿物学和化学变化。这些变化已被证明控制了湖水的地球化学。

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.