摘要
金城洞绿岩带自晚太古代以来经历了多期变形:D_1变形幕,形成片理、片麻理及无根褶曲,是深部构造层次的产物;D_2变形幕,形成轴面片理及一系列轴向NW或NWW向的紧闭同斜或平卧褶皱,并伴有英云闪长岩—奥长花岗岩侵入,是中深部构造层次的产物;D_3变形幕,形成大型开阔褶皱,晚期形成韧性剪切带,是中浅部构造层次的产物。这三幕变形奠定了本区的基本构造格架。D_4变形幕在中浅构造部位形成NE向开活褶皱。古生代以来,本区主要发生脆性变形。
Since the late Archean era,the Jinchengdong greenstone belt had suffered polystagestructure deformations.The deformation episode(D_1) formed schistosity , gneissic schistosityand the unrooted folds. They were products of the deep tectonic levels; D_2 deformationepisode formed axial plane schistosity, aseries of NW or NWW axial close congruous foldsand recumbent folds, associated with intrusion of quartz-biotite diorite and trondjemite. They were products of the middle-deep tectonic levels;D_3 deformation epidode formed openfolds and ductile shear belts, and they were products of the middle-shallow tectonic levels. These three deformations established the tectonic framwork of the Jinchengdong area. D_4 de-formation episode mainly formed open folds of NE strike in the middle-shallom level.SincePalaeozoic era,greenstone belt mainly occurred as brittle deformation.
出处
《吉林地质》
1994年第1期60-68,共9页
Jilin Geology
关键词
金城洞
绿岩带
构造变形序列
吉林
Deformation episode Ductile shear belt Jinchengdong greenstone belt