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| The Reservoir Effect of Radiocarbon Dating in Lake Sediment System |
| Wang Zongli, He Jianhua, Chen Yadong |
| Key Laboratory of Western China's Environmental Systems (Ministry of Education)/Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China |
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Abstract As lake sediment records can provide potentially high-resolution, continuous terrestrial archives of environmental changes, they play an important role in the reconstruction of past climate and environment conditions. Therefore, reliable chronologies are crucial to paleoclimatic studies. Among all dating methods, radiocarbon dating is one of the most useful tools for providing a chronological framework for paleoenvironmental study of lake sediment records. Radiocarbon dating on lake sediments is well known to be very complicated. Accurate chronologies cannot be easily obtained by radiocarbon dating because lack of terrestrial plant macrofossils and suitable dating materials, such as the terrigenous plant residues and charcoal. In fact, the chronology is often established using the organic matter, aquatic debris and various types of shells. However, the reservoir effect that having great influence on the radiocarbon dates with these materials has long been recognized. A closer look at the radiocarbon ages using bulk organic matter and other no-terrestrial macrorests reveals a systematic deviation of the ages on terrestrial plant residue and charcoals. This error has important implications for the resolution of precise event chronologies. In this paper, we review the knowledge from many researches about the reservoir effect in the lake sediment recent years, and detailed summarized the various factors that influenced the radiocarbon dating, discussed how they impact the dating results. We also analysis the current correction method for various types of the reservoir effect in the lake sediments, including the use of same radiocarbon dating method on different dating materials on a given site to find the accurate reservoir effect, and to use various dating methods on the same carbon materials, such as the radiocarbon dating, OSL methods, the 210Pb/137Cs dating and the U-series dating to measure carbon stocks in the correction and find out the high-precision chronology. We hope our work can give reference for future studies in this area.
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Received: 09 January 2014
Published: 20 May 2014
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2014, Vol. 34 
