| A STUDY ON ~(10)Be IN QUARTZ FROM LOESS OF CHINA (Ⅰ)——In situ COSMOGENIC ~(10)Be AND EROSION RATES OF SOURCE REGIONS OF LOESS |
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| 引用本文： | 沈承德,易惟熙,周正,刘东生,J. BEER,H. OESCHGER,G. BONANI,M. SUTER,W. WOLFLI.A STUDY ON ~(10)Be IN QUARTZ FROM LOESS OF CHINA (Ⅰ)——In situ COSMOGENIC ~(10)Be AND EROSION RATES OF SOURCE REGIONS OF LOESS[J].中国科学B辑(英文版),1992(3). |
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| 作者姓名： | 沈承德 易惟熙 周正 刘东生 J. BEER H. OESCHGER G. BONANI M. SUTER W. WOLFLI |
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| 作者单位： | Concurrent Post at Laboratory of Loess and Quaternary Geology,Academia Sinica,Xi'an 710061,PRC.,Concurrent Post at Laboratory of Loess and Quaternary Geology,Academia Sinica,Xi'an 710061,PRC.,Institute of Geochemistry,Academia Sinica,Guiyang 550002,PRC,Guiyan Institute of Geology,Academia Sinica,Beijing 100011,PRC,Laboratory of Loess and Quaternary Geology,Academia Sinica,Xi'an 710061,PRC,Physics Institute,University of Bern,Switzerland,Physics Institute,University of Bern,Switzerland,Institute für Mittelenergiephysik,ETH-Zürich,Switzerland,Institute für Mittelenergiephysik,ETH-Zürich,Switzerland,Institute für Mittelenergiephysik,ETH-Zürich,Switzerland |
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| 基金项目： | This work was financially supported both by the Swiss National Science Foundation and by the National Natural Science Foundation of China |
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| 摘 要： | In situ cosmogenic ~(10)Be in quartz from loess deposited in the last 2,000,000 a is considered to have been derived mainly from initial ~(10)Be in source regions and it bears abundant information about changes in erosion rates of source regions. As have been estimated, the concentrations of "in situ cosmogenic ~(10)Be" in quartz from samples GL47(L1) andGL83 (L2) collected from the Luochuan loess section are 5×10~5 atom/g and 2.2×10~6 atom/g, respectively. As calculated on the basis of the above estimates, the erosion rates of the source regions are: εBeL1=1.5×10~(-3) cm/a for the L1 period (10,000—90,000 a) and εBeL2=3.8×10~(-4) cm/a for the L2 period (130,000—190,000 a). Studies of "in situ cosmogeuic ~(10)Be" in quartz from loess at deeper levels are expected to be applied to ~(10)Be dating of loess strata.
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