论文部分内容阅读
长江下游江北地区广泛发育先寒武纪地层,是我国南方型先寒武纪地层研究的重要基地之一。这些地层中含有铁、铜、磷及稀有元素等有经济价值的矿产。所以该区这些地层层序与划分的研究将丰富我国先寒武纪地质资料,并有利于矿产的寻找及地质构造的再造。 本文根据作者在该区从事先寒武纪地层工作近二十年所积累的丰富资料,并参考地质测量与勘探的大量新成果及同位素年令数据,提出了对该地区广大范围内的皖鄂大别山区、苏皖张八岭区、胶南苏北区及其他地区先寒武纪地层的统一划分,恢复正常层序,并就有关问题进行了讨论。 这些先寒武纪地层除了分出最新的震旦系外,还分为五个群。有两个重要的地层界面。分别置于下、中、上元古代。
The Lower Cambrian strata are extensively developed in the Jiangbei area of the lower reaches of the Yangtze River and are one of the important bases for the study of the southern Cambrian strata in southern China. These formations contain minerals of economic value such as iron, copper, phosphorus and rare elements. Therefore, the study of the sequence and division of these strata in this area will enrich the geological data of the Precambrian in China and be helpful for the search for mineral resources and the reconstruction of geological structure. Based on the rich information accumulated by the authors in the Precambrian strata during the last two decades and with reference to a large number of new achievements in geodesy and exploration and isotope year data, The Dabie Mountains, the Zhangbaling District of Jiangsu and Anhui Provinces, the northern part of the Jiaonan area and other parts of the Precambrian stratigraphy, and the normal sequence was restored. Relevant issues were also discussed. In addition to the most recent Sinian stratigraphy, these Precambrian strata are divided into five groups. There are two important formation interfaces. Respectively placed under, middle and upper antiquarian.