Geologic-geomorphic evidence for the Late Quaternary activity and slip rate of the north segment of the Wenshan—Malipo fault
The Wenshan-Malipo fault is located at the forefront of block movement on the south-east margin of the Qinghai-Xizang Plateau,at the junction of the Sichuan-Yunnan block,South China block,and Indochina block.Studying the characteristics of its neotectonic activity is crucial for understanding the movement patterns along the southeastern margin of the Qinghai-Xizang Plateau.Satellite images of the northern segment clearly show linear characteristics,and Cenozoic basins along the fault are distributed in a string-of-beads pattern.Field geological sur-veys,including several Quaternary profiles along Baishapo and Reshuitang,provide evidence of activities since the Late Pleistocene.The Baishapo fault,which develops on the T2 terrace of the Panlong River,offsets terrace deposits that date to the end of the Late Pleistocene.The 14C dat-ing of the faulted strata yields an age of(15 420±40)a.The fault mainly exhibits right-lateral strike-slip movement,with a component of normal faulting.Based on deformation data from the terrace deposits,the horizontal sliding rate of the fault is estimated to be between 1.6 and 1.9 mm/a.
万方数据
维普
