开放潮坪地区~(210)Pb_(exc)测年CIC和CRS计算模式的选择
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  • 英文篇名:The Choice of CIC and CRS Models of ~(210)Pb_(exc) Dating for Tidal Flat Area
  • 作者:王福 ; 杨彪 ; 田立柱 ; 李建芬 ; 商志文 ; 陈永胜 ; 姜兴钰 ; 杨吉龙 ; 王宏
  • 英文作者:Wang Fu;Yang Biao;Tian Lizhu;Li Jianfen;Shang Zhiwen;Chen Yongsheng;Jiang Xingyu;Yang Jilong;Wang Hong;Tianjin Centre,China Geological Survey;Key Laboratory of Muddy Coast Geo-environment,China Geological Survey;Young Sediments Dating Laboratory,Tianjin Institute of Geology and Mineral Resources;School of Ocean Sciences,China University of Geosciences;
  • 关键词:常量初始浓度模式 ; 恒定补给速率模式 ; 海洋沉积物 ; 渤海湾 ; 海洋地质.
  • 英文关键词:constant initial concentration model;;constant rate of supply model;;marine sediments;;Bohai Bay;;marine geology.
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:中国地质调查局天津地质调查中心;中国地质调查局泥质海岸带地质环境重点实验室;天津地质矿产研究所年轻沉积物测年实验室;中国地质大学海洋学院;
  • 出版日期:2016-06-15
  • 出版单位:地球科学
  • 年:2016
  • 期:v.41
  • 基金:国家自然科学基金项目(No.41206069);; 中国地质调查局百名青年地质英才培养计划项目
  • 语种:中文;
  • 页:DQKX201606005
  • 页数:11
  • CN:06
  • ISSN:42-1874/P
  • 分类号:75-85
摘要
现代沉积物测年方法已经在海岸带地区得到了广泛应用,但在开放潮坪地区还存一定的问题,尤其是在通过210 Pb进行沉积速率计算时,常量初始浓度(constant initial concentration,简称CIC)模式和恒定补给速率(constant rate of supply,简称CRS)模式给出的结果通常差别很大,即使是与137 Cs时标法进行比对时,有时也不易解释.这严重制约了现代沉积物测年方法在开放潮坪及浅海区的应用效果.有鉴于此,选取了其中的1个典型站位的柱状样品,同时开展~(210)Pb_(exc)过量的~(210)Pb的CRS模式和CIC模式计算,并与137 Cs时标法进行对比,结合区域沉积历史数据,对~(210)Pb_(exc)的CRS模式和CIC模式的选择进行了综合分析,为现代沉积物测年在海岸带地区的应用和解释提供了过程参考.结果显示,对~(210)Pb_(exc)数据分段采用CIC模式获得的结果较CRS模式获得的更为可靠.这是因为海岸带地区,被潮流搬运来的沉积物更容易满足CIC计算模式所要求的前提条件,即沉积物中的~(210)Pb_(exc)初始比活度是恒定的.作为一般数据使用者,更倾向于通过~(210)Pb_(exc)测年方法(也就是CRS模式)能够获得每一层的年龄,但在海岸带地区应用该方法时就需要更加慎重.
        Although modern sediment dating method has been widely used in coastal areas,applications in the open tidal flat are still challenged.Especially,~(210)Pb_(exc)dating results given by CIC(constant initial concentration)model and CRS(constant rate of supply)model in the same core are sometimes very different,which is difficult to interpret even compared with the 137 Cs data.In this paper,one typical short core collected from open tidal flat was chosen for a comparison study to facilitate future applications of ~(210)Pb_(exc)methods in open coastal areas.The ~(210)Pb_(exc)CIC and CRS models were employed for the calculation,and the two ~(210)Pb_(exc)dating models were analyzed and compared with 137 Cs method on the basis of sedimentary history data.It is found that the results given by CIC model are more reliable than those by CRS model,which is attributed to the fact that it is easier for the sediments transported by currents to meet the prerequisites for CIC model,in other words,the initial concentration of~(210)Pb_(exc)is constant in most instances in coastal areas.As data users generally are expecting to obtain the age of each layer by~(210)Pb_(exc)dating method(e.g.CRS model),its applications in open coastal area require prudence.
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