Thermal-Mechanical Evolution of the Northern San Andreas Fault System

圣安德烈亚斯断裂系统的演化受与北美西部边缘之下形成的“无奴之窗”的发展和演化有关的热-机械过程控制。作为无奴隶窗口的结果，分隔北美和太平洋板块的板块边界具有复杂的三维几何图形，随着时间的推移而变化，对与圣安德烈亚斯断层系统相关的构造过程产生重要影响。与劳伦斯利弗莫尔国家实验室的一项研究工作相结合，将进行建模和数据解释活动，以解决以下问题：1)评估戈尔达板块南缘与加利福尼亚州北部无奴隶窗口相互作用时的热、地震和应力/强度演变；2)研究北美地壳的热/岩石学演化与地幔上涌、岩浆底侵和壳幔混合的扰动有关；3)详细分析了作为板块边界组成部分的下地壳-上地幔剪切带的演化、地壳断裂的发育以及与圣安德烈亚斯断裂系统有关的地块的位移和变形行为。

The evolution of the San Andreas Fault System is controlled by thermal-mechanical processes associated with development and evolution of a "slabless window" formed beneath the western edge of North America. As a consequence of the slabless window, the plate boundary separating the North American and Pacific plates has a complex 3-D geometry which varies through time, with important consequences for tectonic processes associated with the San Andreas Fault System. In conjunction with a research effort at Lawrence Livermore National Laboratory, modeling and data interpretation activities will be conducted to address the following: 1) Evaluation of the thermal, seismic, and stress/strength evolution of the southern edge of the Gorda Plate as it interacts with the slabless window beneath Northern California; 2) Investigation of the thermal/petrologic evolution of the North American crust in association with perturbations from mantle upwelling, magmatic underplating, and crust-mantle mixing; 3) Detailed analyses of the evolution of the lower crustal - upper mantle shear zones which serve as components of the plate boundary, the development of crustal faults, and the displacement and deformation behavior of crustal blocks associated with the San Andreas Fault System.