Evolution of the Sierra Nevada-Basin and Range Boundary -- the Record in Neogene Basin Deposits

美国西缘的现金城在新近纪是复杂的构造相互作用的场所。盆地和山脉的伸展向西侵入锡尔兰地壳，而在Walker Lane地区发生了分布的右旋滑动(被认为与板块边缘有关)。与弧有关的火山活动及其相关的热效应也发生了停止，大致与门多西诺三重结点平行地向北迁移。这些地区现象之间的相互关系一直存在争议。该项目将利用内华达西北部新近纪盆地中记录的古地理和变形证据来解决这些问题，并将涉及内华达山脉盆地和山脉边界沿线大范围内新生代盆地出土的构造、地层和地质年代学研究。结果将有助于回答几个长期存在的问题，包括Walker Lane之间的时间和运动学、向东和向西的断层和伸展断层，以及现在内华达山脉的隆起。这一信息将有助于阐明大陆边缘地壳活动伸展的其他地区。

9815122Cashman The western margin of the U.S. was the site of complex tectonic interactions during the Neogene. Basin and Range extension was encroaching westward into Sierran Crust while distributed dextral slip (thought to be plate margin related) was occurring in the Walker Lane region. Cessation of arc-related volcanism with associated thermal effects also occurred, having migrated northward roughly in parallel with the Mendocino triple junction. The interrelationships between these regional phenomena has been controversial. This project will utilize the paleogeography and deformation evidence recorded in Neogene basins of northwestern Nevada to address these issues, and will involve structural, stratigraphic and geochronologic studies of exhumed Neogen basins in a broad zone along the Sierra Nevada-Basin and Range boundary. Results will help answer several long-standing questions including temporal and kinematic between Walker Lane faulting and extensional faults to the east and west and uplift of the present Sierra Nevada. This information will help illuminate other areas of active transtension in marginal continental crust.***