Mineral Transformations in Low Grade Rocks

细粒泥质岩的演化 通过低级变质作用的成岩作用正在研究， 着重于扫描和扫描传输技术 电子显微镜（SEM/STEM）。 纹理，组成和 矿物结构的样品序列代表了 各种工艺的范围各自的特征在于 以区分表征过程的变化。 具体项目包括：（a）对蒙皂石进行定性， 伊利石转变 (b)组成的演变，缺陷- 状态和伊利石的晶体尺寸，部分确定 伊利石结晶度变化的原因。“（c） α的变化导致α结晶度的变化。 (d)探讨了MORB的热液蚀变作用， 三八面体混合层关系的演化 层状硅酸盐 (e)三八面体混合结构的演化 泥质中的层状层状硅酸盐。 (f)Na/K演化 双八面体云母 (g)泥质岩的接触变质作用 （h） 形成均质化的页岩，具有云母/云母堆叠。“（i） XRD图谱与混层粘土序列之间的关系。 的 研究解决了一个基本问题， 沉积物变成了变质岩。

The evolution of fine-grained pelitic rocks from early diagenesis through low grade metamorphism is being studied with an emphasis on techniques of scanning and scanning transmission electron microscopy (SEM/STEM). The textures, compositions and structures of minerals from sequences of samples representing the ranges of a variety of processes are each being characterized in order to distinguish the changes that characterize the processes. Specific projects include: (a) characterization of the smectite to illite transformation. (b) evolution of the composition, defect- state and crystal dimensions of illite, in part to determine the origins of changes in illite "crystallinity." (c) evolution of changes in chlorite leading to changes in chlorite crystallinity. (d) prograde hydrothermal alteration of MORB with emphasis on the evolution of mixed-layer relations of trioctahedral phyllosilicates. (e) prograde evolution of trioctahedral mixed- layer phyllosilicates in pelites. (f) evolution of Na/K dioctahedral micas. (g) contact metamorphism of pelites. (h) formation of homogenized shales with chlorite/mica "stacks." (i) relation between XRD patterns and mixed-layer clay sequences. The research addresses the fundamental question as to how fine-grained sediments become metamorphic rocks.