Mesozoic-Cenozoic Tectonic Evolution of the Mojave Desert, California

圣安德烈亚斯断裂带和加洛克断裂带之间的莫哈韦沙漠在美国西南部的构造中占据着关键位置。最近的结果表明，存在着一个以前未被认识的中新世早期裂谷区域，这导致了中生代构造变质事件的发现，并加深了对该地区现代走滑断裂及其在调节太平洋-北美板块运动中的作用的认识。这次更新将重点研究伸展杂岩的结构、时间关系、剪切带岩石学和隆起史，并记录与核杂岩相邻的盆地中同构造和后构造沉积岩的沉积历史。讨论了中新世拆离折返出的中生代高级变质岩的形成时间和形成条件。研究结果将应用于美国西部中、新生代的构造和古地理演化。

The Mojave desert between the San Andreas and the Garlock fault zones occupies a key position in Southwestern U.S. tectonics. Recent results indicate that a previously unrecognized region of early Miocene-age rifting is present which has led to the discovery of Mesozoic tectonometamorphic events as well as to an improved understanding of present strike-slip faulting in the region and its role in accommodating Pacific- North American plate motion. This renewal will focus on the structure, timing relations, shear zone petrology and uplift history of the extensional complex, and will document the depositional history of syn-and post-tectonic sedimentary rocks in basins adjacent to the core complex. The timing and conditions of formation of the Mesozoic high-grade metamorphic rocks exhumed by Miocene detachments will also be addressed. Results will be applied to the Mesozoic and Cenozoic tectonic and paleogeographic evolution of the western United States.