苏北盆地晚更新世晚期湖泊沉积记录的气候环境变化  

Paleoclimatic and Paleoenvironmental Changes in Late Stage of Late Pleistocene Inferred from Lacustrine Sediment in Subei Basin

作　　者：刘玉 杨佩佩 舒强 LIU Yu;YANG Peipei;SHU Qiang(Schoole of Marine Science and Engineering/Schoole of geography scien ce,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京师范大学海洋科学与工程学院/地理科学学院,南京210023

出　　处：《地球与环境》2021年第1期1-8,共8页Earth and Environment

基　　金：国家自然科学基金项目(41671195)。

摘　　要：通过对苏北盆地周奋剖面沉积物进行粒度、地球化学元素比值、磁化率等指标的分析,结合年代数据,重建了苏北盆地晚更新世晚期的古气候环境演化序列。结果表明,晚更新世晚期苏北盆地的古气候环境演变经历了2个阶段:阶段Ⅰ:39.6~30.3 cal ka BP期间,气候整体相对湿润,同时也存在冷干波动;阶段Ⅱ:30.3~18.6 cal ka BP,气候相对比较稳定,以冷干为基本特征。苏北盆地湖相沉积物记录的晚更新世晚期的气候环境演变过程,在大趋势上与三宝/葫芦洞石笋、GISP2冰芯等记录有着很好的对应,千年尺度气候事件也能较好的响应H3、H2等冷干事件,表明苏北盆地晚更新世晚期古气候环境演化具有全球性特征,同时受太阳辐射驱动下的东亚夏季风系统影响明显。Based on multi-proxy analysis of grain size,geochemical elements ratios,mass susceptibility and14 C dating,the paleoclimatic and paleoenvironmentic changes in late stage of late Pleistocene is reconstructed by ZF profile of lacustrine sediment in Subei Basin.The results indicate that the paleoclimatic evolution of Subei Basin can be divided into two major stages,the first stage is from 39.6 to 30.3 cal ka BP,in which the climate is relative warm-humid and exist a cold-dry fluctuation,the second stage is from 30.3 to 18.6 cal ka BP,in which the climate is cold-dry and relative stable.The temporal changes of grain size,geochemical elements ratios,mass susceptibility of ZF profile are consistent with the curve of stalagmites of Hulu/Sanbao Cave and ice cores oxygen isotope curve of Greenland.The millennium-scale climatic events of ZF profile are corresponding to Heinrich events H3,H2 that with dry and cold climate.The results revealed that the climate of late stage of late Pleistocene in Subei Basin has great correlation with the global climate changes and is obviously affected by the East Asian summer monsoon system driven by solar radiation.

关 键 词：苏北盆地 晚更新世晚期 湖泊沉积 古气候环境演化 

分 类 号：X141[环境科学与工程—环境科学] P595[天文地球—地球化学]