末次盛冰期长江南京段古河槽特征  

CHARACTERISTICS OF NANJING PALEOVALLEY SECTION OF THE YANGTZE RIVER DURING THE LAST GLACIAL MAXIMUM

作　　者：曹光杰[1,2] 李彦彦[2] 

机构地区：[1]临沂师范学院实验与教育技术中心,临沂276005 [2]南京师范大学地理科学学院,南京210097

出　　处：《海洋地质与第四纪地质》2009年第3期39-42,共4页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40871010);国家重点基础研究发展规划项目(2003CB415201-8)

摘　　要：根据南京长江大桥、三桥、四桥的地质钻孔资料,绘制南京段长江古河槽地质剖面示意图,对拟建南京长江四桥附近的4个钻孔进行了采样分析,从钻孔沉积物样品的14C年代及阶地形成时间可以判断,南京段约-60^-90 m的深槽为末次盛冰期时的长江河槽,钻孔揭示,南京段长江古河槽狭窄陡峭,呈V型,在南京长江大桥附近形成局部深切。Three cross sections of paleovalley depositional sequences were established based on bore data and documents of Nanjing No. 3 Bridge,the Yangtze River Bridge and Nanjing No. 4 Bridge. Through ^14C dating to samples from 4 drilling cores near the Nanjing No. 4 Bridge which is proposed to construct, it is discovered that the paleovalley at the -60--90m depth near Nanjing existed within the period of last glacial maximum. It is also indicated that the deep incised-valley channel was narrow and the river flowed swiftly. Drilling shows that the valley channel ran deep locally near the Nanjing Yangtze River Bridge,like a “V” shape.

关 键 词：末次盛冰期 古河槽 长江南京段 

分 类 号：P512.31[天文地球—地质学]