An distinguashable ice-dammed lake formed during the Late Pleistocene at the Purlung Tsangpo River,a main downstream tributary of the Yarlung Tsangpo River,in the Songzong Basin of southeast Tibet has been recognized The lacustrine deposit,more than 88 meters thick measured by Total Station(TCA2003),is disclosed after the Songzong landslide.The successional silty clay in the profile is 18.33 meters thick,clearly suggesting the formation of a lake The Optical Simulated Luminescence(OSL) ages at the bottom an...