西藏喀喇昆仑断裂东南段晚第四纪活动的地质地貌特征

为了分析西藏喀喇昆仑断裂东段段第四纪活动地质地貌特征,通过对该段进行遥感影像、野外地质地貌调查、断错地貌测量等方法和手段,获得了该断裂晚第四纪活动的地质地貌特征。在扎西岗北东河流阶地中发现断裂切割全新世的阶地堆积物。同时,对断裂不同的地段进行断错测量,获得了定量的断层数据,反映了断层活动的幅度及期次。研究结果表明,该断裂东南段晚第四纪以来右旋走滑量介于2～220 m,具有多期次活动特征,活动方式以右旋走滑为主,兼具正断分量。

Geological and topographical features of Karakorum fault in southeastern segment, Western Tibet Plateau

Based on measure and analysis of remote sensing image of western Karakorum fault segment, using geology and geomorphology survey and offsets of microrelief measure, we obtained the active features on geology and geomorphology of the fault since the Late Quaternary Period. The preliminary study indicates that the microrelief is offset ranging from ~2m to ~220m in Late Quaternary. The fault is characterized by multi-time activity and dextral strike slipping, with normal fault offset.