大兴安岭地区上古生界变形特征及构造层划分  

Deformation and Tectonic Layer Division of the Upper Paleozoic in Daxing'anling Area

作　　者：刘永江[1] 张兴洲[1] 迟效国[1] 温泉波[1] 梁琛岳[1] 韩国卿[1] 赵立敏[1] 赵英利[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《吉林大学学报（地球科学版）》2011年第5期1304-1313,共10页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学重点基金项目(40739905);高等学校博士学科点专项科研基金项目(200801830041);国土资源部油气专项(2009GYXQ12;2009GYXQ1201);国家留学基金建设高水平大学公派研究生项目(2008617114)

摘　　要：大兴安岭地区古生界构造变形表明,上古生界自二叠纪末以来遭受了3期构造变形改造:第一期变形为二叠纪末华北板块与佳蒙地块碰撞造成的近EW向展布的断裂和褶皱构造,强度由南向北有减弱的趋势;第二期变形为侏罗纪西太平洋板块俯冲导致的NE—NNE向左行走滑断裂和褶皱构造;第三期为NW向具有右行走滑特征的断裂构造,时间大致在晚侏罗世—早白垩世。综合区域构造、沉积岩古地理分析对比,初步将大兴安岭地区上古生界划分为早古生代、D—C1、C2—P2、P3—T14个构造层:早古生代末加里东运动之后,在D—C1期间早期以伸展为主,总体表现为北海南陆的古地理特征;早石炭世末期松嫩地块与额尔古纳—兴安地块沿嫩江—扎兰屯一线碰撞拼接;C2—P2期间总体表现为造山后伸展特征,表现为北陆南海;P3—T1时期古亚洲洋的闭合,海水退出,转为陆相。The structure and deformation studies show that the Upper Paleozoic have been suffered three deformation events since the end of the Permian in the Daxing＇anling area.The first deformation produced E-W trending faults and folds,which were resulted from the collision between the North China plate and Jia-Meng block along the Xar Moron River suture zone.The second deformation formed NE-NNE trending sinistral strike-slip faults and folds due to the western Pacific Oceanic plate subduction to the Asian continent in Jurassic.The third deformation produced the NW trending faults with dextral strike-slip feature in the Late Jurassic-Early Cretaceous.The four tectonic layers of Early Paleozoic,Devonian-Early Carboniferous,Late Carboniferous-Middle Permian and the Late Permian-Early Triassic have been divided according to the studies and the comparisons of regional tectonics and paleo-geography in the Daxing＇ anling area.After Caledonian movement in the end of the Early Paleozoic,the area was in the regional extension tectonic setting during Devonian-Early Carboniferous,which developed marine facies sediments to the north and terrestrial facies sediments to the south.In the end of the Early Carboniferous the Songnen block collided with the Ergun-Xing＇an block along the Nenjiang-Zhalantun belt.During the Late Carboniferous-Middle Permian,the area was in the regional post-orogeny extension tectonic setting with the sediments of the terrestrial facies in the north and the marine facies in the south.The Paleo-Asian Ocean was closed during the Late Permian-Early Triassic period,the sea water retreated from the area and became terrestrial setting.

关 键 词：构造变形 构造层 构造分析 上古生界 大兴安岭 东北地区 

分 类 号：P542[天文地球—构造地质学]