Nature, Timing and Controls of Jurassic Orogenesis in the Western U.S. Cordillera

中生代的弧陆碰撞是一个 沿着北陆西缘的主要构造作用 美国参考 与这一过程相关的侏罗纪事件是 解释为一段短暂的变形期 以及侏罗纪晚期的变质作用， 有证据表明，变形开始于中世纪， 侏罗纪，造山带南部经历了 北方部分缩短。 这个项目将研究在地球上的造山作用的时间 位于内华达州西北部的黑岩沙漠和松坚果山脉 的中西部内华达州，以解决这些细节，并将 采用野外、岩石学和U/Pb和Ar/Ar年龄测定法 技术. 结果应提供新的数据， 侏罗系变形时间的区域差异。

Arc-continent collision during the Mesozoic was a dominant tectonic process along the western margin of north America. Jurassic events associated with this process were interpreted to involve a period of short-lived deformation and metamorphism in the late Jurassic, however recent evidence suggests that deformation began in the Middle Jurassic, and that the southern part of the orogen underwent extension while the northern part underwent shortening. This project will examine the timing of orogenesis in the Black Rock Desert of northwest Nevada and the Pine Nut Range of west-central Nevada to address these details, and will employ filed, petrologic and U/Pb and Ar/Ar age dating techniques. Results should provide new data for refining the regional variations in timing of Jurassic deformation.