Age and genesis of the Shagou River terraces in eastern Qi- Lian Mountains

摘要

The fluvial terrace sequence in eastern Qilian Mountains is a record of periodic uplift events of the Tibetan Plateau. Based on paleomagnetic dating, thermolumines- Cence dating, radio carbon dating and loess-paleosol se- Quence on terraces, we preliminarily determine the ages of Five major terraces of the Shangou River, northern side of the Qilian Mountains. The ages of five terraces were about 830, 418, 250, 140 and 10 ka, respectively. Analysis on character- istics of terraces show that five major terraces were mainly tectonic genesis.