OSL Dating of the River Terraces in Upper Jinjiang River around Fuxi, Northern Guangdong Province

The Nanling Mountain is an important physical geographic dividing line and a barrier for the monsoonal circulation. The remarkable river terraces recorded paleoclimatology and tectonic movement information during Quartenary. There are five river terraces in upper Jinjiang river around Fuxi, Northern Guangdong Province, OSL techniques was used to date sediments from the four higher terraces(T5~T2), The evolution processes of the four terraces were analyzed on the basis of the dating results and the geomorphological and sedimentological characteristics. It was showed that T3 and T2 were formed at 67 ka and 51 ka, corresponding to the early period of marine isotope stage 4 and 3b, respectively. The sediments on the straths deposited during cold periods. The incisions began at the cold-warm transitions. Climate change influenced the alternation of fluvial lateral erosion, deposition and incision processes, but the adequate incision amount was droven by tectonic uplifting. The valley incision ratio of Jinjiang river is 0.267 mm/a, which is more about twofold of the erosion ratio. It is implied that the Nanling Mountain was response to an uplift-incision-erosion mechanism that generally occurs in a young mountain.