The Study of Late Quaternary Activity of the Southern Margin of Qaidam Basin Fault
The faults along the southern fringe of the Qaidam basin serve as the boundary between the Qaidam basin and the eastern Kunlun Mountains.These faults extend approximately 500 km,beginning at Ural in Gansen town in the west and terminating at Nuomuhong in the east.Research on these southern margin faults has been limited,leading to controversy regarding their activity.Historically,it has been assumed that the southern margin fault of the Qaidam basin is a blind fault.This study identifies surface rupture at the Xiaozaohuo segment of the southern margin fault,characterized by fault scarplets.To gain further insight into the fault's activity,we employed the OSL dating to analyze and determine the stratigraphic age.A trench was excavated at the Xiaozaohuo segment,and a shallow seismic investigation was conducted at the Golmud segment.The findings indicate that the Xiaozaohuo section is an active fault dating back to the late Pleistocene,while the Golmud hidden section has shown no signs of fault movement since that period.This research contributes to a better understanding of the seismic activity of the southern margin faults of the Qaidam basin.
The southern margin of Qaidam basin faultPress-thrustLate PleistoceneFault activity
万方数据
维普
