| 云南省程海现代沉积物中137Cs、210Pb的分布及计年研究 |
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| 引用本文： | 胥思勤,万国江. 云南省程海现代沉积物中137Cs、210Pb的分布及计年研究[J]. 地球与环境, 2001, 29(1) |
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| 作者姓名： | 胥思勤 万国江 |
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| 作者单位： | 1. 中国地质大学工程学院,中国科学院地球化学研究所
2. 中国科学院地球化学研究所 |
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| 基金项目： | 国家自然科学基金资助项目!(497732 0 7) |
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| 摘 要： | 程海沉积物柱芯中存在三个峰形完好的137Cs蓄积峰。 94%的137Cs累计值分配于 1985年以前 ,表明程海沉积物中的13 7Cs能较好地保存在沉积年代的相应层节中。该沉积物柱芯中2 10 Pbex的分布特殊 ,据此将近五十年来程海的沉积过程分为三个稳定沉积阶段和两个快速沉积阶段。两种计年方法的结合有助于认识沉积速率变化较大情况下湖泊的沉积状况 ,也有助于加深对核素计年方法的理解
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| 关 键 词： | 137Cs 210Pbex 沉积计年 程海 |
VERTICAL DISTRIBUTION OF 137Cs AND 210Pb AND THEIR DATING IN MODERN SEDIMENTS OF CHENGHAI LAKE, YUNNAN PROVINCE |
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| Xu Siqin+{,)} Wan Guojiang+{)} ). VERTICAL DISTRIBUTION OF 137Cs AND 210Pb AND THEIR DATING IN MODERN SEDIMENTS OF CHENGHAI LAKE, YUNNAN PROVINCE[J]. Earth and Environment, 2001, 29(1) |
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| Authors: | Xu Siqin+{ )} Wan Guojiang+{)} ) |
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| Affiliation: | Xu Siqin+{1,2)} Wan Guojiang+{1)} 1) |
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| Abstract: | Three distinct {}+{137}Cs peaks (formed at 1964, 1975, 1986, respectively) are recognized in the sediment core of Chenghai Lake. 97% of the {}+{137}Cs inventory has been stored in the deep sediments deposited before 1985. These facts show that the biodisturbance and mechanic disturbance in this sediment core are feeble and {{}+{137}Cs} can be stored effectively in the contemporaneous sediment layers. So {{}+{137}Cs} dating is reliable. According to the special vertical distribution of {{}+{210}Pb}, the sedimentation of Chenghai Lake can be divided into three stable sedimentation stages and two quick sedimentation stages in the past 50 years. The combination of these radionuclide dating methods is useful to understand the substantial sedimentation process of the lake where sedimentation rates change rapidly. |
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| Keywords: | Cs {}+{210}Pb sedimentation dating Chenghai Lake |
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