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长江下游是一地理概念,一般指江西九江以下(以东)的长江流域。本文所指的长江下游,包括九江以东,安徽大别山南,张八岑到江苏淮阴响水一线以南和皖南祁门、旌德、广德到江苏太湖南界以北地区,自西向东呈张开的似喇叭形(图1)。 本区位于扬子地台基底之上。南部,芜湖以南为浙闽隆起;北部,长江以北,即安徽全椒—江苏扬州以北,为苏北南黄海凹陷主体;中部,包括芜湖以西的江北部分和芜湖以东的沿江部分,为上述隆起与凹陷间的过渡带。 根据不同构造活动期,本区地层可分为四个
The lower reaches of the Yangtze River is a geographical concept, generally refers to the Yangtze River valley (east) below Jiujiang in Jiangxi Province. This article refers to the lower reaches of the Yangtze River, including the east of Jiujiang, Anhui Dabie Shannan, Zhang Bazen to Jiangsu Huaiyin ring water south of Qimen and Wannan, Jingde, Guangde to the southern boundary of Taihu Lake in Jiangsu Province, from west to east was open Like a trumpet (Figure 1). The area is located on the base of the Yangtze platform. In the south, north of Wuhu is the Zhejiang-Minhang uplift; in the north, north of the Yangtze River, that is, Quanjiao in Anhui Province - north of Yangzhou in Jiangsu Province is the main body of the Huanghai Sag in northern Jiangsu Province. The middle part includes Jiangbei part west of Wuhu and part of the Yangtze River east of Wuhu, Transition zone between uplift and depression. According to different tectonic activities, the strata in this area can be divided into four