Peat in boreholes is the most important 14 C dating material used for constructing age framework. 20 bulk peat samples were collected from five boreholes, the 14 C ages of two fractions (organic sediment fraction and peat fraction) of the bulk peat samples were investigated by AMS-dating and which fraction is better to help construct an age framework for the boreholes were compared and discussed. The results indicated that the peat fraction give a good dating results sequence in the boreholes, compared with the corresponding organic sediment fraction. And the dating results of organic sediment fraction show 161 - 6 702 years older than corresponding peat fraction, which was caused by marine influence. Then, we suggest an experience formula as y =0.99 x - 466.5 by the correlation analysis for correcting the marine influenced organic sediment ages within the conventional ages between 4 000 to 9 000 yrs BP, and more study should be carried out for the AMS 14 C dating of the bulk organic sediments.
Chinese Journal of Oceanology and Limnology – Springer Journals
Published: May 31, 2018
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