COLLABORATIVE RESEARCH: Massive Crustal Reorganization in an Extensional Orogen: A Three-Dimensional Perspective from the Colorado River Extensional Corridor

9628380米勒 大陆地壳对伸展的反应是复杂的，人们对它的认识也不完全，岩浆作用所起的作用也是如此。 本项目将研究对科罗拉多河延伸走廊的埃尔多拉多山区延伸的反应，该地区暴露了强烈的深度梯度。 在北部，伸展主要由脆性特征所适应，而在南部，大规模的正断层将更深层次的岩石带到地表。 在地质年代学、地球化学和古地磁学研究的支持下，对岩体和结构特征进行绘图和结构分析，将确定厚地壳部分的应变组成和三维分区。 研究结果将对地壳伸展机制、陆壳如何被伸展改造以及岩浆活动在伸展构造中的作用等基本问题提供重要的认识。

9628380 Miller The response of the continental crust to extension is complex and incompletely understood, as is the role that magmatisms plays. This project will examine the response to extension in the Eldorado Mountain area of the Colorado River extensional Corridor where a strong depth gradient is exposed. to the north, extension is accommodated by primarily brittle features while to the south, large-scale normal faults bring deeper-level rocks to the surface. Mapping and structural analysis of the plutons and structural features, supported by geochronologic geochemical and paleomagnetic studies, will establish the composition and three-dimensional partitioning of strain in the thick crustal section. Results should provide important insights into several fundamental problems including mechanism of crustal extension, how continental crust is modified by extension and the role of magmatism in extending terranes.