Thermal Evolution of the Zanskar Shear Zone

9418322哈里森这个项目是对从喜马拉雅中部拉萨地区的赞斯卡剪切带收集的一套样品进行40Ar/39Ar分析，以确定该断层的运动日期。赞斯卡剪切带是一个主要的低角度正断层系统的一部分，该系统被称为藏南拆离系统，它似乎横跨造山碰撞前缘的整个长度。这一显著特征在赞斯卡地区的时间限制很差，尽管已知断层在23-20 Ma向东移动了约1000公里。该项目将测量16种分离矿物的40Ar/39Ar，并确定详细的热历史、断层启动的时间和滑移率历史。这一结果将有助于深入了解这一伸展断裂系统的起源和演化，并有助于理解其他主要挤压造山系统的构造演化。

9418322 Harrison This project is to conduct 40Ar/39Ar analyses of a suite of samples already collected from the Zanskar shear zone in the Lhasa district of the central Himalayas in order to date the movement on this fault. The Zanskar shear zone is part of a major low-angle normal fault system known as the Southern Tibetan Detachment System that appears to span the entire length of the orogenic collision front. The timing of this remarkable feature is poorly constrained in the Zanskar region, although about 1000 km farther east the fault is known to have moved at 23-20 Ma. The project will measure 40Ar/39Ar on 16 separated minerals and determine detailed thermal histories, timing of fault initiation and slip-rate history. The results will provide needed insight on the origin and evolution of this extensional fault system and will help understand the tectonic evolution of other major compressional orogenic systems.