Abstract Core D37 and FJ3-12,collected from the offshore area of the Xinhua Bay,Fujian Province,were analyzed by γ-spectrometer to test the activities of 210Pb,226Ra and 137Cs and the activity characters of three nuclide with depth were abtained. It was demonstrated that there existed some differences in mean sedimentation rates of Core D37 and FJ3-12 through CFCS and CRS models for 210Pb inventories and the 137Cs time-scale method, respectively. After eliminating the effect of grain size changes on the nuclide profile,the difference between varied sampling depth is obvious. It is also suggested that the incompleteness of logarithmic attenuation profile(i.e., the sampling depth less than that bearing 210Pb background value)has an adverse effect on calculating sedimentation rates by CFCS and CRS models,even more on CRS model by less incompleteness of the profile. Therefore,a rectification method was proposed to calculate the mean sedimentation rates for the upper boundary of sustaining 210Pb(or none 210Pbex)layer by the CFCS model,and then sedimentary chronology of the study cores by the CRS model with this deduced data. And the mean sedimentation rates of D37 and FJ3-12 are 2.76cm/yr and 4.35 cm/yr,respectively.
Fund:[Co-funded by the National Natural Science Foundation of China(Nos. 41476031,41776052)and the National Technology Basic Investigation Project(No.2013FY112200)]
Corresponding Authors:
Fan Dai-Du,born in 1972,is a professor and Ph.D. advisor of sedimentology at Tongji University. E-mail: ddfan@tongji.edu.cn.
About author: Wang Xiao-Hui,born in 1993,is a master candidate at Tongji University and majors in marine geology. E-mail: xhWang_12@163.com.
Cite this article:
Wang Xiao-Hui,Wu Yi-Jing,Fan Dai-Du. 210Pb derived sedimentation rates in offshore area of the Xinghua Bay,Fujian Province, and proposed calibration method[J]. JOPC, 2019, 21(3): 527-536.
Wang Xiao-Hui,Wu Yi-Jing,Fan Dai-Du. 210Pb derived sedimentation rates in offshore area of the Xinghua Bay,Fujian Province, and proposed calibration method[J]. JOPC, 2019, 21(3): 527-536.
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