Thermal Evolution of the Zanskar Shear Zone

赞斯卡剪切带的热演化

• 批准号: 9418322
• 负责人: Timothy Harrison
• 金额: $ 2万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-01 至 1996-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418322&HistoricalAwards=false
• 关键词: Thermal; Evolution; Zanskar; Shear; Zone

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.

这个项目是对已经从喜马拉雅山脉中部拉萨地区的赞斯卡尔剪切带收集的一套样品进行40Ar/39Ar分析，以便确定该断层的运动日期。在赞斯卡尔地区，这一显著特征发生的时间很难确定，尽管已知断层在往东约1000公里处移动了23-20 Ma。该项目将测量16种分离矿物的40Ar/39Ar，并确定详细的热历史、断层起始时间和滑动速率历史。研究结果将有助于了解该张性断裂系统的起源和演化，并有助于了解其他主要挤压造山系统的构造演化。