Guanghui Dong^1,2, Shanjia Zhang³, Yishi Yang⁴, Lele Ren⁵, Guoke Chen⁴ and Minmin Ma³, (1)Lanzhou University, MOE Key Laboratory of Western China's Environmental Systems, College of Earth Environmental Sciences, Lanzhou, China, (2)Institute of Tibetan Plateau Research, Chinese Academy of Sciences (ITPCAS), CAS Center for Excellence in Tibetan Plateau Earth Sciences and Key Laboratory of Alpine Ecology, Beijing, China, (3)Lanzhou University, MOE Key Laboratory of Western China's Environmental System, College of Earth & Environmental Sciences, Lanzhou, China, (4)Gansu Provincial Institute of Cultural Relics and Archaeology, Lanzhou, China, (5)Lanzhou University, History & Culture School, Lanzhou, China