COLLABORATIVE RESEARCH: Interactions in Time and Space of Thermal and Mechanical Processes During Orogeny, Old Woman Mountains Area, SE California

加利福尼亚州东南部保存着美国大陆边缘20亿年的构造历史记录。该联合体以前的工作已经提供了关于老妇山前寒武纪构造演化、中生代挤压和新生代伸展事件的大量信息。这次更新将建立在这些信息的基础上，以处理大陆地壳的中生代造山过程，特别是典型的造山作用的早期阶段。该地区中生代上地壳首先被构造埋藏到近零到20多公里的深度，然后在中生代末期迅速出土，随后通过强烈叠加邻近地区的中第三纪伸展而基本完好地保存下来。工作将侧重于发展该区域的进进式温度计时技术、韧性剪切带的热历史和运动学历史、温度压力测量的改进及其在快速演化造山带中的应用、岩体侵位与构造作用之间的联系以及试图通过高压包体来描述下大陆地壳的特征。结果将被综合起来，试图更详细地发现大陆边缘动力学中活跃的热过程和机械过程的相互作用。

Southeastern California preserves a record of 2 billion years of tectonic history that occurred along the continental margin of the United States. Previous work on this consortium project has provided considerable information about Precambrian structural evolution, Mesozoic compression and Cenozoic exten- sional events in the Old Woman Mountains. This renewal will build on this information to address Mesozoic orogenic processes in continental crust, particularly on the typically obscure early stages of orogeny. The Mesozoic upper crust in this area was first tectonically buried to depths ranging from near zero to more than 20 kilometers, then exhumed rapidly at the end of the Mesozoic, and subsequently preserved largely intact through the mid-Tertiary extension that strongly overprinted adjacent regions. Work will focus on developing prograde thermochrono- metry for the region, the thermal and kinematic history of ductile shear zones, on refinement of thermobarometry and its application to rapidly evolving orogen, the linkage between pluton emplacement and tectonism and attempting to characterize the lower continental crust through high-pressure xenoliths. Results will be integrated in an attempt to discover in some detail the interactions of thermal and mechanical processes active in continental margin dynamics.