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《Journal of Glaciology and Geocryology》 2011-01
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Terrestrial Cosmogenic Nuclide ~(10)Be Exposure Ages of the Samples from Wangkun Till in the Kunlun Pass

CHEN Yi-xin1,LI Ying-kui2,ZHANG Mei1,ZHANG Jing-chun1,LIU Geng-nian1(1.College of Urban and Environmental Sciences,Peking University,Beijing 100871,China; 2.Department of Geography,University of Tennessee,Knoxville TN 37996,USA)  
Understanding the tectonic and climatic history of the Tibetan Plateau is crucial for studying the regional and global climate systems,particularly the initiation and chronology of paleo-glaciations.Terrestrial cosmogenic nuclide(TCN) exposure age technology provides a tool to re-examine the glacial chronology and landform evolution in the Tibetan Plateau. The Kunlun Pass is one of the great glaciated areas in the East Kunlun Mountains.A sequence of glacial tills is preserved in this area,and the Wangkun till is the oldest one among them.Four of the five 10Be exposure ages of the samples from the Wangkun till range from(56.9±5.6)ka BP to(38.2±3.5)ka BP,corresponding to the MIS 3.These dates are far younger than the ESR and paleomagnetism ages,and they are inconsistent with the geomorphic appearance and sequence.They do not reflect the deposition of the Wangkun till.They may indicate that the Kunlun Pass experienced intense degradation and denudation processes during the MIS 3. The feature that most of the 10Be exposure ages of the samples from the Wangkun till are within the MIS 3 is typical for cosmogenic nuclide exposure studies in Tibet.It is caused mainly by successive exhumation of the moraines during the MIS 3.The large temperature fluctuation and plenty precipitation during the MIS 3 accelerated exhumation and led to an accumulation of boulders of age from 38 to 57 ka.At the same time,the exhumed materials deposited in the lower catchments of the Golmud River and formed the extreme thick Sanchahe formation. The notably younger 10Be exposure ages of the samples from the Wangkun till not only suggest that the TCN exposure age is deeply influenced by the later denudation process,but also show the limitations of using single method for dating.As a result,detailed field investigation on landform and sediments,together with multi-dating-methods are necessary for establishing the Quaternary glacial sequences.
【Fund】: 国家自然科学基金项目(40971002);; 国家重点基础研究发展计划(973计划)项目(2005CB422001)资助
【CateGory Index】: P597.3
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