Radiogenic Isotopic Study of Diagenesis and Low-grade Metamorphism Pelites

沉积岩和浅变质泥质岩记录了 与地壳相互作用的发生、时间和强度 流体，但对这些岩石和事件的放射性同位素研究 导致结果不明确，原因是 关键矿物，尤其是粘土矿物。 该项目将联合收割机 放射性同位素研究（Rb-Sr和K-Ar）， 扫描透射电子显微镜表征 （STEM）为了提供一个解释的坚实基础， 同位素数据 该建议是基于一个成功的“试点” 墨西哥湾沿岸Rb-Sr分析方法的发展 页岩已证实“幕式”成岩作用， 诱导流体流动。 这项研究将扩大研究范围， 全方位的成岩-低级变质作用， 墨西哥湾沿岸页岩的研究，以及连续的 横跨北方纽约和威尔士的序列， 从晚成岩作用到绿片岩相变质作用。

Sedimentary and low-grade metamorphic pelitic rocks record the occurrence, timing and magnitude of interaction with crustal fluids, but radiogenic isotopic studies of such rocks and events lead to ambiguous results due to heterogeneity of source of the key minerals, especially clay minerals. The project will combine radiogenic isotopic studies (Rb-Sr and K-Ar) with detailed characterization by scanning transmission electron microscopy (STEM) in order to provide a firm basis of interpretation of the isotopic data. The proposal is based on a successful "pilot project" development of methods for Rb-Sr analysis of Gulf Coast shales that have verified "episodic" diagenesis by tectonically- induced fluid flow. This research will expand the studies to the full range of diagenesis - low-grade metamorphism with further studies of Gulf Coast shales, and analyses of continuous sequences across northern New York and in Wales that span the range from late diagenesis to greenschist facies metamorphism.