摘要
依据变质岩石组合特征及其在地层序列中的堆叠关系,吉南地区古元古代集安岩群自下而上可划分为蚂蚁河岩组、荒岔沟岩组、大东岔岩组,其沉积时限为2350～2150Ma,经历了低压相系高角闪岩相的变质作用,并被晚期花岗岩侵入(2160Ma);老岭群自下而上可划分为达台山组/林家沟组、珍珠门组、花山组、临江组、大栗子组,其沉积时限为1900～1800Ma,经历了中压相系低角闪岩相的变质作用。集安岩群伏于老岭群之下,原岩建造为一套大陆拉斑玄武岩--蒸发岩--(钙质)硬砂岩--复理石组合,属裂谷环境沉积;老岭群的原岩建造为一套石英砂岩--白云岩--页岩组合,属陆内坳陷沉积。
Based on the assemblage characteristics of metamorphic rocks and their stacking relations in the stratigraphic sequence, Paleoproterozoic Ji＇an Group in southern Jilin can be divided into Mayihe, Huangchagou and Dadongcha formations in descending order, deposited ranging from 2 350 to 2 150 Ma in age, which underwent high amphibolite facies metamorphism of low-pressure facies and invaded by late granites at 2 160 Ma. The Laoling Group can be divided into Dataishan/Linjiagou, Zhenzhumen, Huashun, Linjiang and Dalizi formations in descending order, ranging from 1 900 to 1 800 Ma in age, which underwent low amphibolite facies metamorphism of mid-pressure facies. The Ji＇an Group underlies the Laoling Group. The primary rock formation of the Ji＇an Group is a combination of continental tholeiite-evaporite-（calcareous） graywacke-flysch and belongs to rift environment sedimentation, and the primary rock formation of the Laoling Group is quartz sandstone-dolomite-shale and belongs to intra-continental depression sedimentation.
出处
《世界地质》
CAS
CSCD
2009年第4期424-429,共6页
World Geology
基金
国土资源大调查项目(2001130000048)
关键词
古元古代
地层层序
吉南地区
Paleoproterozoic
strata sequence
southern Jilin Province
