RUI: Is the CLMSZ an Early Cretaceous Extensional Accomodation Zone?

加利福尼亚半岛山脉的侏罗纪晚期到白垩纪早期的历史被认为涉及到一个海洋弧与北美克拉通的碰撞，崩塌了两者之间的沉积盆地。然而，一个突出的剪切带被认为记录了这次碰撞，已被证明涉及年龄太年轻的岩石，并且具有伸展而不是收缩的运动学。该项目将包括绘制库亚马卡-拉古纳山脉剪切带的详细地图，研究定向样品和放射性测年。研究结果为半岛山脉晚侏罗世至早白垩世的碰撞模型提供了一个检验。

The late Jurassic to early Cretaceous history of the Peninsular Ranges, California is thought to involve collision of an oceanic arc with cratonic North America, collapsing a sedimentary basin between. However, a prominent shear zone thought to record this collision has been shown to involve rocks of too young an age and has extensional, not contractional kinematics. This project will involve detailed mapping of the Cuyamaca- Laguna Mountains shear zone, study of oriented samples and radiometric age dating. Results should provide a test of the collisional model for the late Jurassic to early Cretaceous of the Peninsular Ranges.