| 苏干湖沉积物纹层计年和~(210)Pb，~(137)Cs测年对比 |
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| 引用本文： | 周爱锋,强明瑞,张家武,陈发虎,钟艳霞,陈建徽,肖舜.苏干湖沉积物纹层计年和~(210)Pb，~(137)Cs测年对比[J].兰州大学学报(自然科学版),2008,44(6). |
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| 作者姓名： | 周爱锋 强明瑞 张家武 陈发虎 钟艳霞 陈建徽 肖舜 |
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| 作者单位： | 兰州大学西部环境教育部重点实验室; |
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| 基金项目： | 国家自然科学基金创新群体项目(40721061); 国家自然科学基金(40671192)资助． |
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| 摘 要： | 通过对西北干旱区苏干湖表层沉积物的年纹层计数定年和~(210)Pb,~(137)Cs测年结果对比发现:~(137)Cs测年结果在8.5 cm出现最高蓄积峰,对应1963年世界核爆高峰期,但在同一层位~(210)Pb测年结果则是1972年,存在较大的偏差.年纹层沉积速率达0.31 cm/a,而根据CRS模式建立的~(210)Pb沉积速率为0.30 cm/a.年纹层反映的沉积速率和~(210)Pb测年结果基本一致,互相验证了两者测年的可靠性.~(137)Cs测年则存在蓄积峰向上迁移的现象,在西北干旱区湖泊使用~(137)Cs测年过程中需引起注意.
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| 关 键 词： | 年纹层 苏干湖 ~(210)Pb ~(137)Cs测年 |
Comparison of varve chronology and ~(210)pb,~(137)Cs dating from the Sugan Lake sediment |
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| ZHOU Ai-feng QIANG Ming-rui ZHANG Jia-wu CHEN Fa-hu ZHONG Yan-xia CHEN Jian-hui XIAO Shun.Comparison of varve chronology and ~(210)pb,~(137)Cs dating from the Sugan Lake sediment[J].Journal of Lanzhou University(Natural Science),2008,44(6). |
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| Authors: | ZHOU Ai-feng QIANG Ming-rui ZHANG Jia-wu CHEN Fa-hu ZHONG Yan-xia CHEN Jian-hui XIAO Shun |
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| Institution: | ZHOU Ai-feng QIANG Ming-rui ZHANG Jia-wu CHEN Fa-hu ZHONG Yan-xia CHEN Jian-hui XIAO Shun(Key Laboratory of Western China\'s Environmental Systems with the Ministry of Education Lanzhou University,Lanzhou 730000,China) |
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| Abstract: | A detailed examination of sedimentary cores retrieved from Sugan Lake in the northern Qaidam Basin of the northwest China's Tibetan Plateau reveals that fine laminated beddings (varve) formed in the sediments.Radiometric dating shows that the highest ~(137)Cs activity appeared at 8.5 cm depth,which correlated with the 1963 maximum of emission due to the nuclear bomb testing.However the ~(210)pb dating result shows a different year (1972) in the same depth.Varve chronology result shows a great agreement with... |
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| Keywords: | 210Pb |
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