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引用本文:陈永福,赵志中.干旱区湖泊沉积物中过剩210Pb的沉积特征与风沙活动初探.湖泊科学,2009,21(6):813-818. DOI:10.18307/2009.0610
CHEN Yongfu,ZHAO Zhizhong.Preliminary study on excess210Pb flux characteristic of lake sediment in arid regions and its implication for aeolian activity. J. Lake Sci.2009,21(6):813-818. DOI:10.18307/2009.0610
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干旱区湖泊沉积物中过剩210Pb的沉积特征与风沙活动初探
陈永福1, 赵志中2
1.中国科学院地质与地球物理研究所, 北京 100029;2.中国地质科学院地质力学研究所, 北京 100081
摘要:
过剩210Pb不仅是沉积物年龄测定的重要手段,而且是环境示踪的一种主要方法.干旱区湖泊主要为封闭湖泊,其沉积物所接受的过剩210Pb沉积在大气沉降背景外,主要受风沙侵蚀来源的影响.因此,较高的过剩210Pb沉积通量有可能与区域风沙活动有关.本文在对比分析近几年来发表在各期刊中的湖泊210Pb数据的基础上,计算各个湖泊多年平均过剩210Pb的沉积通量并与大气过剩210Pb沉降背景比较,从而初步确定中国北方干旱区风沙活动的可能区域.然后对所确定的典型风沙多发区,利用过剩210Pb模式(PF-CRS)计算沉积物沉积速率,并与相应区域的"尘暴"记录对比,进而论证该方法在指示风沙活动方面的可靠程度.
关键词:  干旱区  湖泊沉积物  Pb-210沉积通量  沉积速率  风沙活动
DOI:10.18307/2009.0610
分类号:
基金项目:国家重点基础研究发展计划(973)项目“北方干旱化与人类适应”子课题“北方干旱化进程中的阶段性转折和突变及其可预测研究”(2006CB400503)资助
Preliminary study on excess210Pb flux characteristic of lake sediment in arid regions and its implication for aeolian activity
CHEN Yongfu1, ZHAO Zhizhong2
1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, P.R.China;2.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, P.R.China
Abstract:
Excess210Pb dating is not only an important method for sediment dating, but also a major environmental tracer. In aridregions, excess210Pb deposited in lake sediment mainly depends on wind erosion recycle besides the atmospheric precipitation fluxbackground. Therefore, the higher excess210Pb is a potential for identifying the aeolian activities. This paper makes a systematicalanalysis on the data published in recent years, and calculates the multi-year average excess210Pb flux in different lakes. Thus, the areasin which multi-year average excess210Pb flux that exceeded atmosphere flux background could be recognized preliminarily as regionalaeolian deposits. And then, we use the excess210Pb model (PF-CRS) to calculate the lake sedimentation rates in some typical aeolianregions. At last, we compare the results with the dust records correspondingly so as to estimate the reliability of this method.
Key words:  Arid regions  lake sediment  Pb-210 flux  sedimentation rates  aeolian activities
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