Magnetic susceptibility and paleoclimate,paleoenvironment evolution since Holocene in Poyang Lake area

摘要：

Paleoclimate and paleoenvironment evolution history have been reconstructced since Holocene in Poyang lake area based on the magnetic susceptibility curve,data of organic carbon stable isotopes of the ZK01 boreholes deposit,profile of the borehole core,and the testing of 14C dating.It is show that Poyang plain has gone through 3 large-scale evolutions of expanding and shrinking and migrating in different climatic environmental evolution processes since Holocene.From 8000aB.P.to 3452aB.P.the sedimentary environment evolved gradually from river facies to prodelta facies.From 3452 to 650aB.P.,sediment of lake facies was dominating,with 3 cycles of lake progression and regression.Poyang lake has risen and dropped intermittently forming delta front sediment since 650aB.P.(B.C.1300a).It is also indicated that the lower values of susceptibility and organic carbon isotopes of lake sediments respond to the warmer and wetter environment,and to the expanding lake scope and the rising lake-level whereas the higher values of the susceptibility and organic carbon isotope respond to the drier and colder environment,and to the smaller and sinking lake.

关键词： Poyang Lake area magnetic susceptibility organic carbon stable isotope paleoclimate,paleoenvironment

作者: Changan Li Yufen Zhang Zhenxing Ma Hongxia Peng

作者单位: Faculty of Earth Science,China University of Geosciences,Wuhan 430074,China Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China Jiangxi Academy of Geological Survey,Nanchang,China

会议类型: 国际会议

会议名称: The 3rd International Conference on Environmental and Engineering Geophysics(第三届环境与工程地球物理国际会议)

会议地点: 武汉

会议语种:英文

页码: 477-481

在线出版日期: 2008-06-15（万方平台首次上网日期，不代表论文的发表时间）