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《Acta Palaeontologica Sinica》 2014-02
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MID-HOLOCENE PALYNOLOGICAL RECORD OF JINXI AREA IN THE YANGTZE RIVER DELTA REGION AND ITS ENVIRONMENTAL SIGNIFICANCE

MENG Yu-ting;WANG Wei-ming;LI Bao-hua;DING Jin-long;Key Laboratory of Economic Stratigraphy and Palaeogeography,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Science;University of Chinese Academy of Sciences;Suzhou Archaeological Institute;  
A palynological study is carried out for the samples from a manual profile(31°11′53.9″N,120°55′26.3″E)of the Lake Bailian in Jinxi area,which is dated back to around 7 230 cal a BP.The site is located in the east Taihu Plain,where it is susceptible to the seawater transgression during the Holocene.Four palynological assemblages are recognized from the profile in ascending order.Zone 1is predominated by Cyclobalanopsis,reflecting a warm climatic condition.The percentage of deciduous Quercus increases while the percentage of Cyclobalanopsis shows a slight decline in Zone2,exhibiting apossible cooler climate.Zone 3witnesses a recovery of the percentage of Cyclobalanopsis,indicating a resuming warm climate.Both percentages of deciduous Quercus and Pinus increase in Zone 4,inferring a cooler climate again.Though pollen record shows slight climatic fluctuations,the overall environment reflected by the pollen data correlates with the warm climatic condition of the Holocene Optimum.Based on dinoflagellates and other related pollen evidence,all of the sampling beds were affected by the seawater with the exception of the lowest one.Pollen data from Zone 1and Zone 2also display two possible marine transgression and regression cycles.The current pollen result clearly reflects the climatic changes during the Mid-Holocene in the Yangtze Delta region,and the associated sea-level changes as well.The new palynological record in this research provides a good supplemental evidence for the study of Holocene climatic change and seawater transgression in the Yangtze River Delta region.
【Fund】: 中国科学院战略性先导科技专项(XDA05120101)的资助
【CateGory Index】: Q914
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