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Chronology of Holocene lacustrine sediments in Co Ngoin, central Tibetan Plateau

Science china Earth {1. 2006年第9期49卷 991-1001页

作者： wu yanhong1. wang sumin1. hou xinhua1.3.1. key laboratory of lake sedimentation and environment, {1. Institute of geography and limnology, chinese academy of sciences, nanjing 21.008, china 2. Institute of Tibetan Plateau Research, chinese academy of sciences, Beijing 1.085, china 3. Graduate University of chinese academy of sciences, Beijing 1.0039, china 1. key {1. of lake sedimentation and environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China 2. Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 10085 China 3. Graduate University of chinese academy of sciences Beijing 100039 China

Chronology is the basis for using lacustrine sediments to reconstruct the history of en-vironmental change. Radioactive-nuclides such as 1.C, 21.Pb and 1.7Cs dating are mainly used to establish the chronology for recent several ten thousand years. Because of being mixed with “dead carbon”, the measured 1.C age is always older than the actual age which is recognized as “reservoir effect”. Cs is a kind of active metal element, and easy to migrate vertically in the sediment that leads to the error of the time marker. 21.Pb dating should make sure to select CIC model or CRS model. On the Tibetan Plateau, most of the lakes are alkaline closed lake where Cs is more moveable in the sediment and the reservoir effect caused by “dead carbon” on 1.C dating is stronger. Based on the analysis on results of 1.C, 21.Pb and 1.7Cs of the lacustrine sediments from Co Ngoin, central Tibetan Plateau, we use the simple regression method to re-calculate the 1.C calendar ages, and establish the time sequence for cores CE-1.and CE-2 with result of 21.Pb CRS model for the upper 35 cm and re-calculated 1.C calendar age for sediments bellow 35 cm. Since 1.00 cal. a BP, sedimentation inter-rupted for more than 1.00 years. According to this time sequence, variations of environmental proxies confidently reflect the major climatic events in Holocene.

关键词： 1.C, 21.Pb and 1.7Cs, chronology, lacustrine sediments, climatic event, Co Ngoin, central Tibetan Plateau.

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