RUI: The Role of Extension During the Evolution of a Transform Plate Boundary, Northeastern Vaja California, Mexico

晚中新世，随着里维拉三联结的通过，太平洋-北美板块边界由陆-洋辐合边缘演变为以变形为主的裂谷边缘，再演变为以变形为主的裂谷边缘。墨西哥的下加利福尼亚州是一个可以在成功的大陆裂谷演化过程中记录伸展和走滑断层的不同作用的地区之一。该项目包括测绘、构造研究、地层学和地球化学研究以及下加利福尼亚华雷斯山脉南部中新世和更年轻岩石的Ar/Ar地质年代学。研究结果将有助于深入了解大陆地壳向大洋板块转移过程中大陆伸展的作用。

The Pacific-North America plate boundary evolved from a continent-ocean convergent margin to a transform-dominated rift margin to a transform-dominated rift margin with the passing of the Rivera triple junction in late Miocene time. Baja California, Mexico is one of the areas where the differing roles of extension and strike slip faulting can be documented throughout the evolution of a successful continental rift. This project includes mapping, structural studies, stratigraphic and geochemical studies and Ar/Ar geochronology of Miocene and younger rocks in the southern Sierra Juarez, Baja California. Results will provide insights into the role of continental extension during the transfer of continental crust to an oceanic plate during the transition from a convergent to transform-dominated rift plate boundary.