Evidence for glaciation predating MIS-6 in the eastern Nyainqêntanglha Range, southeastern Tibet  

作　　者：Shangzhe ZHOU Jinming XIE Xianjiao OU Liubing XU Yong SUN Xuezhen ZENG Xiaoxia WEN Renrong CHEN Hong YANG Xianmei HUANG Yazhong ZHOU Jinjin SUN 

机构地区：[1]Department of Geography Science,South China Normal University,Guangzhou 510631,China [2]College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China [3]School of Geography and Tourism,Jiaying University,Meizhou 514015,China [4]Key Laboratory of Tibetan Environment Changes and Land Surface Processes,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Science China Earth Sciences》2021年第4期559-570,共12页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 41771065, 42071088, 41271077 and 41371080)。

摘　　要：Southeastern Tibet is one of the most glaciated regions on the Tibetan Plateau both at present and during the Quaternary. Numerical dating of glacial deposits has allowed the establishment of a provisional chronology of Quaternary glacial fluctuations in this region, with the oldest glaciation(Guxiang Glaciation) occurring in marine oxygen isotope stage 6(MIS-6).During our recent field investigations, a morphostratigraphically older lateral moraine than that of the Guxiang Glaciation has been first identified, which is ~500–600 m above the Guxiang Glaciation moraine and discontinuously preserved on valley shoulders in the Bodui Zangbo River valley, eastern Nyainqêntanglha Range in southeastern Tibet. Considering the moraine is best preserved at Nitong Village, here we name the glacier advance which deposited the moraine as "Nitong Glaciation". Using electron spin resonance(ESR) technique, we dated the Nitong Glaciation moraine to 506.3±60.4 ka. Taking into account the age error and climatic conditions, we consider it most likely that the Nitong Glaciation occurred during MIS-12, although it might had happened sometime earlier.

关 键 词：Southeastern Tibet MIS-12 Glaciation ESR dating Quaternary Glaciation 

分 类 号：P343.6[天文地球—水文科学]