放射性核素210Pb、137Cs测定巴丹吉林沙漠湖泊岩芯的年代及沉积速率
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本文为中国地质科学院基本科研业务费项目(编号 YYWF201525);国家地质实验测试中心基本科研业务费(编号2013CSJ02、2015CSJ02)项目资助成果。


Determination of recent sedimentation rates in inter-dune lakes of the Badain Jaran Desert, China using the radionuclide (210Pbuns and 137Cs ) dating
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    摘要:

    巴丹吉林沙漠发育了世界上独一无二的丘间湖泊群,100多个永久性的丘间湖泊分布于沙漠的东南部。沙漠湖泊岩芯是干旱地区重要的气候、环境档案,然而受沙漠湖泊发育极端环境的影响,岩芯测年面临很大挑战。本文选择巴丹吉林的沙漠南缘的阿尔吉林和敦德吉林进行钻探,获取无扰动岩芯,利用核素(210Pb、137Cs)进行测年,并计算其沉积速率。结果表明:(1)核素(210Pb和137Cs)测年能够获取巴丹吉林沙漠丘间现代湖泊岩芯的可靠年代。(2)岩芯Ar-1的CRS测年结果为102±8a,沉积速率分布范围为0.13 ~ 0.33cma-1,岩芯Dd-1的CRS测年结果为123±2a,沉积速率分布范围为0.18 ~ 0.70cma-1。(3)沙漠岩心沉积速率空间分布具有自沙漠腹地向边缘递增的趋势,210Pbuns-CRS平均沉积速率分布范围为 0.16 ~ 0.57cma-1 ,137Cs沉积速率分布范围为0.05 ~ 0.6 cm a-1。未来对于沉积速率空间变化的可能影响因素,如高大沙山的围限阻挡效应、137Cs的分子扩散效应以及古地震等,应进行更深入研究。

    Abstract:

    The unique inter-dune lake group, over 100 permanent lakes, developed in the southeast of the Badain Jaran Desert. Inter-dune lake sediment cores are important climate and environment archives of the dryland, but dating inter dune lake sediment cores using radionuclide (210Pb,137Cs)challenged by extreme environment of the desert, such as low flux of radionuclide caused by rare precipitation. Two lakes, Arerjilin and Dundejilin in the southeast of the Badain Jaran Desert were chosen to drill and obtained undisturbed sediment cores for dating with 210Pb and 137Cs. Results show that: (1) reliable ages of inter-dune lake sediment cores can be obtained by radionuclide (210Pb, 137Cs) dating. (2) dating result of Core Ar-1 and Dd-1are 102±8a and 123±2a respectively based on CRS model, and sedimentation rate are ranging from 0.13 to 0.33cma-1,from 0.18 to 0.70cma-1 respectively. (3) Sedimentation rates estimated from inter-dune sediment cores increase from the central region to the margin of the desert in spatially, and average sedimentation rates ranges from 0.16 to 0.57cma-1 estimated from 7 inter dune lake sediment cores CRS ages, from 0.16 to 0.57cma-1 derived from 11 inter-dune lake sediment cores` 137Cs ages. In the future, impacted factors of the sedimentation rates of inter-dune lake sediment cores spatial varying, such as mega-dune`s barrier to inter dune lakes, 137Cs molecular diffusion even paleo-earthquake, should be pay more attention in the study in-depth and careful.

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刘斯文,储国强,赖忠平.2016.放射性核素210Pb、137Cs测定巴丹吉林沙漠湖泊岩芯的年代及沉积速率[J].地质学报,90(8):2013-2022.
Liu Siwen, CHU Guoqiang, LAI Zhongping.2016. Determination of recent sedimentation rates in inter-dune lakes of the Badain Jaran Desert, China using the radionuclide (210Pbuns and 137Cs ) dating[J]. Acta Geologica Sinica,90(8):2013-2022.

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  • 收稿日期:2016-05-11
  • 最后修改日期:2016-05-11
  • 录用日期:2016-08-23
  • 在线发布日期: 2016-08-23
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