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

9419115在与大陆碰撞有关的著名变质带中，峰值变质作用通常是在主要地壳增厚期间或之后达到的。相反，在大洋/大陆碰撞边界形成的变质带通常保存在造山带最终融合之前获得的低级变质作用。该项目将重点研究内华达山脉西部变质带中保存的变质作用，蛇绿岩保存的变质作用早于白垩纪内华达山脉岩基，可能早于侏罗纪。这些结果将有助于评估内华达山脉晚侏罗世内华达变形的热效应。这一结果也可能为解释其他大洋/大陆碰撞环境中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.