Evidence of tectonic activities happened since the Middle Pleistocene in central Qiangtang, northern Tibet, China

A detailed field geological survey of Dashahe mud volcano group, river terrace structure and active faults was included in the 4 sheets Eastern Gemu Mountain area, Shuanghu Region during the 1∶50000 field investigations, during this time, we have identified 60 mud volcanoes, of which two TL age were 151.97 ± 12.92ka and 10.76 ± 0.91ka, which indicated that there were a few eruption events from Late Pleistocene to Middel Pleistocene. Measured Dasha River section confirms the existence of II terrace and three times new tectonic movements. Six TL ages were obtained, respectively belong to the Mid-Pleistocene(167.17 ± 14.21 ka), Late Pleistocene(113.27 ± 9.63ka, 42.22 ± 3.59 ka, 83.84 ± 7.13 ka, 75.47 ± 6.41 ka),Holocene(7.61 ± 0.65 ka). Combined with a special mud volcano - fault structure in Dasha River, it is concluded that in the Mid-Pleistocene, this area was controlled by NWW active faulting, and had experienced three stages with a strong differential uplifting and intensive erosion.