摘要
吉林省早前寒武纪地质包括太古宙花岗—绿岩带、早元古代集安群和中元古代老岭群。太古宙花岗—绿岩带，划分为早太古代和晚太古代花岗—绿岩带，二者在岩石组合、变质变形特征、岩石化学、地球化学等方面均有一定差别，为不同火山—沉积旋回产物，花岗质岩石属高铝型英云闪长岩—奥长花岗岩类；早元古代集安群，通过构造解析和变质变形的研究，从下至上重新划分为蚂蚁河组、荒岔沟组和大东岔组，为解决地层重复划分和金属找矿工作提供了新思路；进一步讨论了中元古代老岭群地层划分，初步查清了老岭群层序划分方面的几个问题，及吉林省早前寒武纪地质研究中存在的问题，为提高早前寒武纪地质的研究水平提供了方向。
The early Precambrian in Jilin province includes the Archaeozoic granite-greenstone belt,early Proterozoic Ji’an Group and mid Proterozoic Laoling Group .The Archaeozoic granite greenstone belt was divided into that in the early and late stages which show some differentiae in rock association ,character of metamorphic deformation ,lithochemistry and so on .They are the products of different volcanos-sedimentary cycles.The granite belongs to high-alumina tonalite-trondjemite;the Mayihe Formation,Huangchagou Formation and Dadongcha Formation of the early Proterozoic Ji’an Group were redivided from top to bottom ,through the study of structural analysis and metamorphic deformation.A new idea for solving straigraphic redivision and ore prospecting is proposed.Meanwhile,some problems on the early Procambriam geology of Jilin province are proposed for going further into a study.
出处
《吉林地质》
1998年第3期22-31,共10页
Jilin Geology
关键词
早前寒武纪
绿岩带
集安群
老岭群
地质
地层
The early Procambrian Granite-greenstone belt Ji'an Group Laoling Group
