论文部分内容阅读
一、基本情况天津位于河北平原东部,横跨三个构造单元。西北部以新开河、候台子为界属冀中拗陷;市区位于沧县隆起北端;东南以葛沽、小站为界隶属黄骅拗陷,拗陷部位基岩埋深达三千米以上,上面覆盖着巨厚的第三、第四系松散岩层。沧县隆起的轴部千米左右可见奥陶系灰岩。沦县隆起在市区的部位又有三凸一凹,它们是:天津凸起——位于市区南部,是三个凸起中范围最大、重力值最高的一个凸起。马房凸起——位于市区东南;
First, the basic situation Tianjin is located in the eastern Hebei Plain, across three tectonic units. Northwest Xinkaihe, waiting for the sub-border Jizhong depression; urban area is located in Cangxian uplift north end; southeast of Ge, small station under the industry under the Huanghua depression, depression parts of the bedrock buried depth of three kilometers Above, covered with thick third, quaternary loose rock formation. Cangxian uplift around the shaft visible Ordovician limestone km. In Xunxian uplift in the urban areas there are three convex concave, they are: Tianjin convex - located in the southern part of the urban area, is the largest of the three raised, the highest gravity of a bulge. Stables - located in the southeast of downtown;