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Analyses of the ~(10)Be Concentration Fluctuations in Lake Deposits for Identification of the Paleo-glaciers in Quaternary Period

ZHANG Xin-bao 1,2 (1.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu Sichuan 610041, China; 2.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xian Shaanxi 710075, China)  
The shapes of depth distribution profiles of fallout { { } 137 Cs }, which were produced by nuclear weapon testing during the period of 1950-1970, are different in the deposits between non-glacial and glacial lakes. As fallout { { } 137 Cs } with a short half life of 30 ^17 a in modern lake deposits, depth distribution shapes of cosmogenic radionuclide 10 Be with a long half of 1.5 Ma should be different in the deposits between glacial and non-glacial lakes during Quaternary period. For a glacial lake, the amounts of accumulated ice layers and the containing 10 Be radionuclide are greater than the delivering values by meltwater over the catchment in glacial periods, while the amounts are less the delivering values in inter-glacial period. The fluctuations of 10 Be concentrations in deposit profiles of glacial lakes may reflect the changes of ice accumulation and melting during the quaternary period. For non-glacial lakes, there are no such effects of ice accumulation and melting on the { { } 10 Be } delivering yields from the catchment exist during the Quaternary period. A comparative study on { { } 10 Be } in deposits between glacial and non-glacial lakes may have great potential for solving the century s debate on the paleo-glaciers in the eastern low-middle mountain regions and on the ice sheet in the Tibet Plateau of China.
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