Much late onset of Quaternary glaciations on the Tibetan Plateau:determining the age of the Shishapangma Glaciation using cosmogenic 26Al and 10Be dating  

作　　者：Yixin Chen Yingkui Li Mei Zhang Zhijiu Cui Gengnian Liu 

机构地区：[1]College of Urban and Environmental Sciences, Peking University, Beijing 100871, China [2]Department of Geography, University of Tennessee, Knoxville, TN 37996, USA [3]College of Urban and Environment Science, Changchun Normal University, Changchun 130032, China

出　　处：《Science Bulletin》2018年第5期306-313,共8页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(41101003,41230743,41328001,and 41371082);National Natural Science Awards of China(2009) to Yafeng Shi,Zhijiu Cui,Jijun Li,Benxing Zheng,and Shangzhe Zhou(Z104-2-05)

摘　　要：The onset of Quaternary glaciations is a critical event in the climate and tectonic history of the Tibetan Plateau.The Shishapangma Glaciation,defined based on the till deposit from the northern slopes of Mt.Shishapangma,has been identified as the oldest glaciation on the Tibetan Plateau.However,the timing of this glaciation has not been constrained.We measured^(10)Be and^(26)Al concentrations of a set of boulders on top of this till and simulated their complex exposure-burial histories.The simulated results indicate that the formation age of this till is likely around 835.2±241.0 ka,representing the minimum timing of glacial onset on the Tibetan Plateau.The Shishapangma Glaciation is apparently much younger than the glacial onset in many other areas of the world,such as Europe and North America,and was likely driven by the coupled effect between tectonic uplift and climate cooling during the early–middle Pleistocene transition.The onset of Quaternary glaciations is a critical event in the climate and tectonic history of the Tibetan Plateau.The Shishapangma Glaciation,defined based on the till deposit from the northern slopes of Mt.Shishapangma,has been identified as the oldest glaciation on the Tibetan Plateau.However,the timing of this glaciation has not been constrained.We measured^(10)Be and^(26)Al concentrations of a set of boulders on top of this till and simulated their complex exposure-burial histories.The simulated results indicate that the formation age of this till is likely around 835.2±241.0 ka,representing the minimum timing of glacial onset on the Tibetan Plateau.The Shishapangma Glaciation is apparently much younger than the glacial onset in many other areas of the world,such as Europe and North America,and was likely driven by the coupled effect between tectonic uplift and climate cooling during the early–middle Pleistocene transition.

关 键 词：GLACIAL onset Tibetan Plateau Quaternary GLACIATIONS COSMOGENIC NUCLIDES Exposure-burial history simulation 

分 类 号：P534.63[天文地球—第四纪地质学] P597.3[天文地球—古生物学与地层学]