Menghan Qiu¹, Yongqiang Wang², Qiurong Ruan², Jianye Han³, Fengwen Liu^1,4, Shanjia Zhang¹ and Guanghui Dong^5,6, (1)Lanzhou University, MOE Key Laboratory of Western China's Environmental System, College of Earth & Environmental Sciences, Lanzhou, China, (2)Xinjiang Institute of Cultural Relics and Archaeology, Urumqi, China, (3)Renmin University of China, School of History, Beijing, China, (4)Yunnan University, School of Resource Environment and Earth Science, Kunming, China, (5)Lanzhou University, MOE Key Laboratory of Western China's Environmental Systems, College of Earth Environmental Sciences, Lanzhou, China, (6)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