Fluid Induced Fault-Zone Refrigeration: Petrologic, Isotopic, and Thermal Modeling Constraints

9811872美国西部莫里森科迪勒兰变质核杂岩显示新生代大规模地壳伸展。沿拆离断层的滑动记录了侧向位移，但要建立这种现象的真实模型，还需要其他对隆升和时间的约束。热年代学数据为冷却、隆升和滑动速率提供了最好的定量约束，然而，在对这些数据的解释中，固有的假设是下盘的冷却是通过传导来响应隆升的。最近的研究表明，冷却的发生可能是由于沿分离体流下的地表水从下板块平流吸收热量。这个项目旨在测试这个新想法。研究结果对岩心复合体和隆升速率有许多启示。

9811872Morrison Cordilleran metamorphic core complexes of the western US manifest large-scale Cenozoic crustal extension. Slip along the detachment faults documents lateral displacement, but other constraints on uplift and timing are required to develop realistic models of this phenomenon. Thermochronologic data have provided the best quantitative constraints on the cooling, uplift and slip rates, however inherent in the interpretation of these data is the assumption that cooling of the footwall occurred via conduction in response to uplift. Recent work has indicated the possibility that cooling occurred from advective extraction of heat from the lower plate by surface water flowing down the detachment. This project is aimed at testing this new idea. Results have many implications related to core complexes and rates of uplift.