Collaborative Research: Late Cenozoic To Recent Fault Slip Distribution in the Central Walker Lane Belt, Western Nevada

该项目将利用野外测绘、构造地貌学、古地震学、热年代学和地质年代学的综合方法，支持对Walker Lane中央带南部被称为Mina偏转的板块断层系统的动力学研究。米纳偏转内的断层定义了一个区域尺度的释放弯曲，将滑动从东加利福尼亚剪切带转移到沃克莱恩带。东加利福尼亚剪切带和沃克莱恩带位于东部以盆地和山脉的东西向伸展为主，西部以太平洋-北美板块边界的西北向剪切为主的边界上。伸展和横流剪切之间的相互作用导致了一系列复杂的断层的发展，这些断层可以容纳板内应变。这项研究在很大程度上是由正在进行的大地测量学调查所推动的，这些调查是关于当今应变积累的幅度和跨东加利福尼亚剪切带和沃克巷带的应变分布模式的。鉴于这些大地测量对应变积累的限制，我们有必要进一步了解晚新生代至近代应变释放的时空格局。这两个数据集将为东加利福尼亚剪切带和沃克莱恩带演化的地球动力学假设提供重要的约束。准确描述东加利福尼亚剪切带和沃克莱恩带内的时空应变分布，对于理解与太平洋和北美板块相互作用有关的更广泛的板内变形区域的构造过程至关重要。

This project will support the investigation of the dynamics of a system ofintraplate faults in the southern part of the central Walker Lane belt, known as the Mina deflection, using an integrated approach of field mapping, tectonic geomorphology, paleoseismology, thermochronology, and geochronology. Faults within the Mina deflection define a regional-scale releasing bend that transfers slip from the Eastern California Shear Zone to the Walker Lane Belt. The Eastern California Shear Zone and Walker Lane Belt straddle the boundary between dominantly east-west extension in the Basin and Range province to the east and dominantly NW-shear along the Pacific-North American plate boundary to the west. The interaction between extension and transcurrent shear has resulted in the development of a complex array of faults that accommodate intraplate strain.The research is motivated in large part by ongoing geodetic investigations on the magnitude of present-day strain accumulation and pattern of strain distribution across the Eastern California Shear Zone and Walker Lane Belt. In light of these geodetic constraints on strain accumulation, it is timely to improve our understanding of the spatial and temporal patterns of strain release during late Cenozoic to Recent times. The two data sets will provide important constraints on geodynamic hypotheses proposed for the evolution of the Eastern California Shear Zone and Walker Lane Belt. An accurate characterization of the temporal and spatial strain distribution within the Eastern California Shear Zone and Walker Lane Belt is crucial for understanding tectonic processes over a much broader area of intraplate deformation associated with the interaction between the Pacific and North American plates.