137Cs及
 210Pb
 ex方法湖泊沉积计年研究新进展

doi:10.11867/j.issn.1001-8166.1995.02.0188

地球科学进展 ›› 1995, Vol. 10 ›› Issue (2): 188 -192. doi: 10.11867/j.issn.1001-8166.1995.02.0188

¹³⁷Cs及 ²¹⁰Pb _ex方法湖泊沉积计年研究新进展

万国江

中国科学院地球化学研究所环境地球化学国家重点实验室贵阳 550002

收稿日期:1994-06-20 出版日期:1995-04-01
通讯作者: 万国江
基金资助:
国家自然科学基金项目“高原湖泊200年沉积记录及季节性沉降微粒地球化学研究（编号:49070183)和“云贵现代湖泊沉积地球化学过程及环境信息的辨识与提取”(编号:49333040)资助.

PROGRESSES ON ^I37Cs AND ²¹⁰Pb _ex DATING OF LAKE SEDIMENTS

Wan Guojiang

State Key Lab. of Environmental Geochemistry, Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550002

Received:1994-06-20 Online:1995-04-01 Published:1995-04-01

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¹³⁷Cs及²¹⁰Pb_ex方法广泛应用于湖泊现代沉积计年。不扰动沉积物柱心的采样和高精度的分样装置是获取准确计年结果的前提。沉积物剖面中1975年层节¹³⁷Cs次级峰值可作为辅助计年时标；沉积物中绝大部分¹³⁷Cs处于稳定态保证了¹³⁷Cs计年时标的可靠性。季节性滞水带缺氧湖泊中²¹⁰Pb沉积后再迁移可能导致²¹⁰Pb_ex计年结果偏低。沉积物早期成岩过程中，铅化学相的转移提供了铅扩散迁移的地球化学条件；Pb—Po的扩散机理分别受Fe—Mn循环控制。

关键词: 湖泊现代沉积计年, ¹³⁷Cs, ²¹⁰Pb_ex

The ¹³⁷Cs and ²¹⁰Pb_ex techniques are widely employed for dating recent sediments of lakes. There is important provision to gain dating results correctly with the sampling device of no-disturbing sediments and the sample separation of high precision. The secondary peak of ¹³⁷Cs in sediment horizon of 1975 could be as an assistant dating time marker. Most part of ¹³⁷Cs in sediments is at stable position which provides reliability for ¹³⁷Cs dating time marker. The post-depositional remobilization of ²¹⁰Pb could lead to the lower rate of sediment accumulation in seasonal anoxic hypolimnia of lakes.The transformation of Pb species has provided the geochemical condition of its diffusion in the processes of early diagenesis. The diffusion mechanism of Pb-Po is controlled by cycling Fe-Mn, respectively.

Key words: Dating recent sediment of lakes, ¹³⁷Cs, ²¹⁰Pb_ex

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PROGRESSES ON I37Cs AND 210Pb ex DATING OF LAKE SEDIMENTS

PROGRESSES ON ^I37Cs AND ²¹⁰Pb _ex DATING OF LAKE SEDIMENTS