下二台群的构造变形特征及同位素测年的地质意义  

GEOLOGICAL IMPLICATION OF THE STRUCTURAL DEFORMATION AND ISOTOPIC DATING OF XIAERTAI ROCK-GROUP

作　　者：李东涛 刘中元 胡晋伟 王晓鸥 孙鹏慧 

机构地区：[1]辽宁省地质矿产调查院,辽宁沈阳110032 [2]辽宁省地质矿产勘查局,辽宁沈阳110032

出　　处：《地质与资源》2008年第2期81-85,108,共6页Geology and Resources

摘　　要：下二台群是出露于辽宁省北部、吉林省南部的一套变质岩系,位于吉黑造山带南缘.在1∶5万区域地质调查工作中,运用造山带非史密斯地层理论、构造解析及韧性变形带研究方法,对其构造变形进行系统研究,划分出3期构造变形作用,并进行了同位素测年.据此从原下二台群地层中剥离出太古宙变质表壳岩组合,并依据此套变质岩系的构造变形特征将原下二台群地层改建为下二台岩群.Xiaertai group is a suit of metamorphic rocks outcropped in northern Liaoning Province and southern Jinlin Province, tectonically located in the south margin of Jilin-Heilongjiang orogenic belt. During the 1：50000 scaled regional geological survey, the theory of non-Smith stratum in orogenic belt is adopted, with structure analysis and ductile deformation zone research method, to systematically study the structural deformation of the strata. Aided by isotopic dating, three stages of structural deformation are identified, on this basis, the Archean metamorphic supracrustal rock unit is separated from original Xiaertai group. According to deformation features of the metamorphic series, the Xiaertai group is renamed as Xiaertai rock-group.

关 键 词：下二台岩群 构造变形特征 太古宙变质表壳岩组合 同位素测年 非史密斯地层 

分 类 号：P542[天文地球—构造地质学] P597[天文地球—地质学]