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《Journal of Glaciology and Geocryology》 2007-01
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The Sequence of Quaternary Glaciations around the Tanggula Pass

WANG Jie1,ZHOU Shang-zhe1,2,TANG Shu-lin3,Patrick M.Colgan4,Jeffrey S.Munroe5 (1.National Laboratory of Western China's Environmental Systems of Ministry of Education of China and Department of Geography,Lanzhou University,Lanzhou Gansu 730000,China;2.Department of Geography,South China Normal University,Guangzhou Guangdong 510631,China;3.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;4.Department of Geology,Grand Valley State University,1 Campus Drive,Allendale,MI 49401,USA;5.Department of Geology,Middlebury College,Middlebury VT 05753,USA)  
Based on investigations and studies of modern and ancient glaciers around the Tanggula Pass,dating of cosmogenic radionuclide 10Be exposure age of the last glacial moraine bounders(or striated outcrops) of this region,four data,i.e.,(16.1±1.7) ka BP,(31.9±3.4) ka BP,(41.4±4.3) ka BP and(66.8±4.3) ka BP,were gained.Combined with the former studies and dating,it is believed that the area around the Tanggula Pass has experienced four major Pleistocene Glaciations,corresponding to marine isotope stage(MIS) 2,3,4 and 6,respectively,and two Holocene glacial advances(the Neoglaciation and the Little Ice Age).The dating results are consistent with those in other areas of the Tibetan Plateau.The extent of the Last Glacial Maximum was limited;however,the scale of glacial advance during MIS 3/4 even exceeded that of the Last Glacial Maximum.The Tanggula Glaciation and Basicuo Glaciation named in the early expedition are demonstrated occurring during the late Middle Pleistocene(MIS 6) and the early stage of the Last Glaciation(MIS 4).There is no dating result older than MIS 6 in the oldest moraines of this area,perhaps,due to destruction later or insufficient of collecting samples.Further study of timing of the oldest glaciation in this area should be performed.
【Fund】: 国家自然科学基金项目(40371013;40501007);; 国家重点基础研究发展规划项目(G1998040811)资助
【CateGory Index】: P343.6
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