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

详细的地质测绘、地质年代学和地温气压测量作为东部大盆地地壳横截面开发的指南

• 批准号: 8707435
• 负责人: Arthur Snoke
• 金额: $ 11.5万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1990-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707435&HistoricalAwards=false
• 关键词: Detailed; Geologic; Mapping; Geochronology; Geothermobarometry

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.

内华达州和犹他州东部的大盆地经历了一个复杂的 中生代岩浆、变质和变形叠加历史 事件以及普遍的新生代韧脆性伸展 历史 先前的工作已经概述了这段历史的重要方面， 该项目是一项恢复地壳横截面的研究 大盆地东部，采用40 Ar/39 Ar、 U-Pb年代学和地质温压学。 研究区 新生代地壳伸展作用使中地壳岩石出露， 提供了一个窗口，以了解中生代和新生代的基础设施， 北美西部科迪勒拉山脉。 结果将提供准确的时间 与中生代汇聚有关的构造事件 随后的延伸，连同精确的地壳交叉- 部分，将允许在复杂的构造深入表征 北美洲西部边缘的演化。