摘要
吉林省境内的下元古界主要分布于吉南三半江—大东岔一带。这一带赋存着丰富的贵金属、多金属和非金属矿产。前人为了解决这一带的基础地质问题,以查明上述矿产的赋存规律,曾先后进行过区域地质调查、矿产普查和专题性研究工作,并找到了一些金、铜、铅、锌、硼、云母、石墨等矿产。但对其地层的划分及时代隶属则众说纷纭。1960年长春地质学院吉南区测队进行的1:20万通化市幅区测时,将其归为太古界中鞍山群,下划3个组,即何家街组、小荒沟组和八宝沟组。1961年通化地质大队辑安分队将其划为集安亚群,由下而上划为4个组,即何家街组、清河组、蚂蚁河组、大东岔组,并划分9个岩性段。1962～1964年6101队在霸王朝—蚁字沟进行1:5万区测时,将其称为鞍山群集安亚群,下划3个组15个岩性段(表1)。在此之后的20几年间,大多数生产和科研单位都基本上遵循和延用了这一划分方案。1973年吉林省区测队编1:300万地质图时,首次将集安亚群改称集安群,时代定为下元古界,置于鞍山群之上、老岭数之下。同年郑传久、张文驹、贾汝颖等对集安群又进行了较为全面的总结。
The lower Proterozoic strata in southern Jilin are mainly distributed along the Sanbanjiang-Dadongeha arca.The former geologists did a lot of work about them,and the times and division of these strata have not been defined.The author made a lot of geological investigation in that area.On the basis of the previous results and according to the features of spacial dis- tribution of all rock—formations as well as the paleogeographic environ- ments,the author divided these strata into the boron—bearing formation of the Mayihe Group,the graphite-bearing formation of Upper Qinghe Group and its aluminum—bearing formation. In different sections,the Qinghe Group contacts with the Mayihe Group in different locotions.The Mayihe Group has undergone two-phase mig- matization and the Qinghe Group has not suffered from it The Mayihe Group belonged to the eugeosynclinal facies before 2300 Ma.and the Qinghe Group was in the late stage of evolution of eugeosyncline after 2085Ma.i.e.miosyn- clinal facies,indicating that these two groups are not in the same tectonic formation,meanwhile,showing that cheer is an unconfcrmabi (?)lity between these two groups.
出处
《吉林地质》
1989年第4期46-57,94,共13页
Jilin Geology
