Geochronology, Metamorphism, and Thermal Evolution of a Continental Margin Orogenic Belt: Northern Sierra Nevada, CA

9419115天 在著名的与大陆碰撞有关的变质带中，变质作用的高峰期通常是在地壳增厚期间或之后。 与此相反，在大洋/大陆碰撞边界形成的变质带通常保存着造山带最后合并之前获得的低级变质作用。 该项目将重点关注保存在Sierra内华达州西部变质带中的变质作用，其中蛇绿岩保存了早于白垩纪Sierra内华达州岩基的变质作用，可能与早侏罗世一样古老。 结果将有助于评估晚侏罗世的热效应，内华达州变形在内华达州。 这一结果也可能为解释其他大洋/大陆碰撞背景下的变质作用提供指导。

9419115 Day In well-known metamorphic belts associated with continental collisions, peak metamorphism commonly was reached during or after major crustal thickening. In contrast, metamorphic belts formed at the boundary of ocean/continent collisions commonly preserve low grade metamorphism acquired prior to the final amalgamation of the orogen. This project will focus on the metamorphism preserved in the western metamorphic belt of the Sierra Nevada where ophiolite preserves metamorphism that pre-dates the Cretaceous Sierra Nevada batholith and may be as old as early Jurassic. Results will help evaluate the thermal effects of the late Jurassic, Nevadan deformation in the Sierra Nevada. The outcome may also provide guidance in interpreting metamorphism in other ocean/continent collision settings.