Detailed Geologic Mapping, Geochronology, and Geothermobarometry as a Guide to the Development of a Crustal Cross-Section for the Eastern Great Basin

位于内华达州东部和犹他州的大盆地经历了一段复杂的中生代岩浆、变质和变形事件的历史，以及普遍存在的新生代韧性-脆性伸展历史。先前的工作已经概述了这一历史的重要方面，该项目是一项研究，目的是通过结合40Ar/39Ar、U-Pb年代学和地质温压测量等方法恢复大盆地东部的地壳横断面。在研究区，新生代地壳伸展挖出了中地壳岩石，从而为了解北美科迪勒拉西部的中、新生代基础设施提供了窗口。结果将提供与中生代会聚和随后的伸展有关的构造事件的准确时间，再加上准确的地壳横断面，将能够深入描述北美西缘复杂的构造演化。

The Great Basin in eastern Nevada and Utah has experienced a complex history of superposed Mesozoic magmatic, metamorphic, and deformational events as well as a pervasive Cenozoic ductile-brittle extensional history. Prior work has outlined important aspects of this history, and this project is a study to restore a crustal cross-section for the eastern Great Basin, by a combination of methods including 40Ar/39Ar, and U-Pb geochronology and geothermobarometry. In the study area, the Cenozoic crustal extension has exhumed middle crustal rocks, thereby providing a window into the Mesozoic and Cenozoic infrastructure of the western North American Cordillera. Results will provide accurate timing of tectonic events associated with Mesozoic convergence and with subsequent extension, which together with an accurate crustal cross- section, will allow an in depth characterization of the complex tectonic evolution of the western margin of North America.