Mesozoic-Cenozoic Tectonic Evolution of the Mojave Desert, California

位于圣安德烈亚斯和加洛克断裂带之间的莫哈韦沙漠在美国西南部构造中占有重要地位。最近的研究结果表明，存在一个以前未被认识的早中新世裂陷区，这导致了中生代构造变质事件的发现，并提高了对该地区现今走滑断裂及其在容纳太平洋-北美板块运动中的作用的认识。此次更新将重点关注拉张杂岩的构造、时间关系、剪切带岩石学和隆升史，并将记录与核心杂岩相邻的盆地中同构造和后构造沉积岩的沉积历史。本文还将讨论中新世组所发掘的中生代高变质岩的形成时间和条件。研究结果将应用于美国西部中、新生代构造和古地理演化。

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.