太湖THS孔现代沉积物<sup>137</sup>Cs和<sup>210</sup>Pb的分布及计年

姚书春; 李世杰; 刘吉峰; 薛滨; 夏威岚

太湖THS孔现代沉积物¹³⁷Cs和²¹⁰Pb的分布及计年

1 中国科学院南京地理与湖泊研究所湖泊沉积与环境重点实验室, 南京 210008;
2 中国科学院研究生院, 北京 100039

基金项目:

中国科学院知识创新工程重大战略计划项目(KZCX1-SW-12-I)

国家科技部重大基础研究前期研究专项(2004CCA02900)

详细信息

作者简介:
姚书春(1975-),男,助理研究员,博士生,主要从事湖泊沉积地球化学研究

中图分类号: P597.1
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出版历程
- 收稿日期: 2005-07-31
- 修回日期: 2005-11-24

RECENT SEDIMENTATION OF THS CORE IN SOUTHERN TAIHU LAKE INFERRED FROM ¹³⁷Cs AND ²¹⁰Pb MEASUREMENTS

1 Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2 Graduate School of CAS, Beijing 100039, China

摘要

摘要: 太湖THS沉积物柱状岩心中存在3个明显的¹³⁷Cs蓄积峰,高含水率和有机质含量是前苏联切尔诺贝利核电站核泄漏对应的¹³⁷Cs蓄积峰向表层迁移的一个可能的原因。利用¹³⁷Cs核素1963年和1975年对应的蓄积峰计算出沉积速率为0.34 cm/a。利用¹³⁷Cs核素1963年对应的蓄积峰进行校正,采用²¹⁰Pb计年的CRS模式获得不同时段的沉积速率,发现在80年代末沉积物堆积通量最高,达到0.6 g/(cm²·a)。两种计年方法的结合有助于认识沉积速率的变化情况。
- 沉积速率 /
- ²¹⁰Pb /
- ¹³⁷Cs /
- 太湖
Abstract: THS core was collected from southern Taihu Lake. Three distinct peaks of ¹³⁷Cs are observed in the core. Results of ¹³⁷Cs analyses indicate disturbance in the top surface. Up-core transference of ¹³⁷Cs peak of Chernobyl disaster is partially caused by high water content and organic matter in the sediment. Using depths recorded in 1963 and 1975 as the datum levels, the average sedimentation rate is calculated to be 0.34 cm/a. Corrected ²¹⁰Pb dates and sedimentation rates are calculated based on CRS model using the ¹³⁷Cs date in 1963 as a reference point. The results show that sedimentation flux rates are very high, reaching 0.6 g/cm·a around 1990s. The combination of these radionuclide dating methods is useful for us to understand the sedimentation process of the lake where sedimentation rates changed.
- ²¹⁰Pb /
- ¹³⁷Cs /
- Taihu lake

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参考文献(13)

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