PROGRESSES ON I37Cs AND 210Pbex DATING OF LAKE SEDIMENTS
Received date: 1994-06-20
Online published: 1995-04-01
The 137Cs and 210Pbex techniques are widely employed for dating recent sediments of lakes. There is important provision to gain dating results correctly with the sampling device of no-disturbing sediments and the sample separation of high precision. The secondary peak of 137Cs in sediment horizon of 1975 could be as an assistant dating time marker. Most part of 137Cs in sediments is at stable position which provides reliability for 137Cs dating time marker. The post-depositional remobilization of 210Pb could lead to the lower rate of sediment accumulation in seasonal anoxic hypolimnia of lakes.The transformation of Pb species has provided the geochemical condition of its diffusion in the processes of early diagenesis. The diffusion mechanism of Pb-Po is controlled by cycling Fe-Mn, respectively.
Key words： Dating recent sediment of lakes; 137Cs; 210Pbex
Wan Guojiang . PROGRESSES ON I37Cs AND 210Pbex DATING OF LAKE SEDIMENTS[J]. Advances in Earth Science, 1995 , 10(2) : 188 -192 . DOI: 10.11867/j.issn.1001-8166.1995.02.0188
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