The Choice of CIC and CRS Models of 210 Pbexc Dating for Tidal Flat Area
Wang Fu
Yang Biao
Tian Lizhu
Li Jianfen
Shang Zhiwen
Chen Yongsheng
Jiang Xingyu
Yang Jilong
Wang Hong
Abstract：Although modern sediment dating method has been widely used in coastal areas,applications in the open tidal flat are still challenged.Especially,210 Pbexc 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 da-ta.In this paper,one typical short core collected from open tidal flat was chosen for a comparison study to facilitate future ap-plications of 210 Pbexc methods in open coastal areas.The 210 Pbexc CIC and CRS models were employed for the calculation,and the two 210 Pbexc 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 Pbexc is constant in most instances in coastal areas.As data users generally are expecting to obtain the age of each layer by 210 Pbexc dating method (e.g.CRS model),its applications in open coastal area require prudence.
Keywords：constant initial concentration modelconstant rate of supply modelmarine sedimentsBohai Baymarine geology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 971-981 )