末次盛冰期以来长江南通段古河谷的地层特征  

STRATIGRAPHIC FRAMEWORK CHARACTERISTICS OF THE YANGTZE RIVER’S INCISED VALLEY IN NANTONG SINCE THE LAST GLACIAL MAXIMUM

作　　者：曹光杰[1,2] 王建[1] 屈贵贤[1] 

机构地区：[1]南京师范大学地理科学学院 [2]临沂师范学院地理与旅游学院山东临沂276005

出　　处：《地层学杂志》2007年第2期175-178,共4页Journal of Stratigraphy

基　　金：国家重点基础研究发展计划(973计划)专题"变化条件下长江下游河道演化的规律"(2003CB415201-8);国家教育振兴计划教育部青年奖励基金(2001JBC12)共同资助。

摘　　要：通过对南通段古河谷典型钻孔及剖面沉积物颗粒、微体生物化石、14C测年等的分析,对末次盛冰期以来的沉积地层进行了划分。该段古河谷末次冰期以来的地层,基本上反映了河床相—河漫滩相—浅海相—三角洲相的冰后期海侵沉积旋回。现代河床的底部,浅海相淤泥质亚黏土层已被侵蚀掉,沉积的是现代河床相砂层。By analyzing the sedimentary particlessize, microfossil and ^14C dating of the sediment cores and cross-sections, this paper divides the sedimentary strata of the Yangtze River＇s incised-valley in Nantong since the global Last Glacial Maximun（LGM）. The stratigraphic sequence of the Yangtze River in Nantong since LGM reflects the postglacial transgression sedimentary cycle of river channel facies,floodplain facies, shallow marine facies and deltaic facies. The shallow marine facies mud-silt subclay in the bottom of the modern channel was corroded. The sediment in the bottom of modern channel is channel facies sands.

关 键 词：末次盛冰期 第四纪 长江南通段 江苏 古河谷 地层 

分 类 号：P534.63[天文地球—第四纪地质学]