论文部分内容阅读
蓟县县城以北,从景儿峪至下营一带,出露元古界至下古生界的一套以碳酸盐岩为主的地层,它是我国震旦系的标准剖面。蓟县的震旦系为巨厚沉积,总厚近一万米,接触关系清楚。关于蓟县震旦系的划分,经过前人的研究,多数意见认为分为青白口群、蓟县群和长城群三个群。由于府君山组之下有微角度不整合,但在燕山、太行山等地区也可以见到明显间断。一般认为府君山组之下的间断面,是蓟县运动所形成的微角度不整合,应作为寒武系与震旦系的分界,把景儿峪组、下马岭组划入震旦系的上部。震旦系的下限是常州村组,与下伏地层为明显的不整合接触。
To the north of Jixian County, from Jing’eryu to Xiaying area, a set of carbonate-dominated strata from the Proterozoic to the Lower Paleozoic are exposed. It is a standard section of the Sinian in China. The Sinian in Jixian is a thick deposit with a total thickness of nearly 10,000 meters and a clear relationship of contacts. About Jixian division of the Sinian, through previous studies, the majority of opinions that divided into Qingbaikou Group, Jixian Group and the Great Wall Group of three groups. Due to the micro-angle unconformity under the Fu Jun Shan group, obvious discontinuities can also be seen in areas such as Yanshan and Taihang Mountains. It is generally believed that the discontinuities under the Fujunshan Formation are micro-angle unconformities formed by the Jixian movement and should be regarded as the boundary between the Cambrian and Sinian strata. The Jing’eru Formation and Xiamaling formations should be classified into the Upper Sinian Formation . The lower limit of the Sinian is the Changzhou village group, which is obviously unconformity with the underlying strata.