吉南地区早元古代变质岩系的划分和对比

吉南地区早元古代变质岩系（集安群，老岭群），在近年１：５万区域地质调查中，以构造为纲，通过对构造变形的调查研究和构造解析，在澄清区域构造形成的基础上，依据变新方向和指标新标志，在正确恢复地层层序的前提下，遵循岩石地层单位划分原则，为形中的不同和岩石组合和沉积环境的差异，经反复分析对比，重新厘定为两个岩群，八个岩组。

SUBDIVISION AND CORRELATION OF AN EARLY PROTEROZOIC METAMORPHIC SYSTEM IN THE SOUTHERN JILIN PROVINC

Through the reginal geologic in vestigation(1:50000)in recent years,tectonic defor-mation of an early Proterozoic metamorphic system(Ji'an Group, Laoling Group)in theSouthern Jilin province has been tectonically researched and analysed.On the basis of the dis-tinguishing regional structural form, deformation orieiitation,restorative original stratigraph-ic sequence,stratigraphic division principle,different deformation events,the differences be-tween rock association and depositional environmcnt as well as repeated analyses and correla-tion,finally,two rock sets and eight rock grotips are determined.