Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in Lanzhou area

作     者：PAN Baotian , SU Huai, HU Chunsheng, HU Xiaofei, ZHOU Tian and LI Jijun (Key Laboratory of Western China’s Environmental Systems, Ministry of Education, and Department of Geography, Lanzhou University, Lanzhou 730000, China) 

作者机构：Key Laboratory of Western China's Environmental System MOE Department of Geography Lanzhou University Lanzhou 730000 China 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2007年第17卷第2期

页      面：197-205页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：Supported by National Natural Science Foundation of China (Grant Nos. 40421101 and 40471016) the Major State Basic Research Development Program of China (Grant Nos. 2005CB422001) 

主　　题：Lanzhou area Yellow River terrace dating. 

摘      要：Based on the aeolian loess sequence-stratigraphic division and paleomagnetic datings on terraces, we found that an undiscovered terrace with the age of 1.0 Ma BP lies between the Dunwashan terrace and Wuyishan terrace. This terrace recorded an intensive Yellow River incision event during that period. Results of paleomagnetic dating and optically stimulated luminescence (OSL) dating of the Wuyishan loess section and Zaoshugou loess section on the fourth Yellow River terrace (T4) show that the age of the fourth Yellow River terrace in Lanzhou area is 0.86 Ma BP rather than the previously believed 0. 6 Ma BP. This result answers a long-term question in the ge-omorphology community of whether there exists a 0. 8 Ma terrace in Lanzhou area. The discovery of the 1. 0 Ma Yellow River terrace and redating of the age of 0.6 Ma terrace in Lanzhou area provide new insights into further research on the evolution of Yellow River.