Petrologic and Isotopic Investigations of Fluid Flow During Metamorphism

9404578渡轮拟议的研究将评估流体流动的数量和几何形状如何影响区域和接触变质岩的矿物学，化学和同位素演化。 它包括在美国、苏格兰和意大利的各种地质环境中，对六个接触带中的硅质辉长岩的研究。 对于每个光环，将绘制矿物组合和O-和C-同位素组成的空间分布图。 将为每个光环建立以运输理论为基础的简单模型，以预测作为流体量函数的沿着样品横向各点的矿物组合和同位素组成。 观测结果与预测结果的比较将有助于了解光环内和光环间气流的变化。 这些结果与构造背景的耦合也可能导致关于深度、岩性和构造对流动的量和几何形状的控制的概括。

9404578 Ferry The proposed research will evaluate how the amount and geometry of fluid flow affect the mineralogical, chemical, and isotopic evolution of regional and contact metamorphic rocks. It includes the study of siliceous dolomites in six contact aureoles in a variety of geologic settings in the United States, Scotland, and Italy. For each aureole the spatial distribution of mineral assemblages and O- and C- isotope compositions will be mapped. Simple models grounded in transport theory will be developed for each aureole to predict mineral assemblages and isotopic compositions at each point along sample traverses as a function of fluid amount. Comparison of observation with prediction will lead to an understanding of both intra-aureole and inter-aureole variability in flow. Coupling of these results with tectonic setting may also lead to generalizations about the control of depth, lithology, and structure on the amount and geometry of flow.