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内蒙古苏左旗地区晚古生代构造—岩浆活动及地壳演化特征

张臣 李茂松   

  1. 北京大学地质学
  • 收稿日期:1997-03-20 修回日期:1997-03-20 出版日期:1997-03-20 发布日期:1997-03-20

THE FEATURES OF LATE PALEOZOIC TECTONO-MAGMATIC ACTIVITY AND CRUSTAL REVOLUTION IN THE S0UTHERN SUZUOQI AREA

Zhang Chen, Li Mao-song   

  1. Department of Geology, Peking University, 100871
  • Received:1997-03-20 Revised:1997-03-20 Online:1997-03-20 Published:1997-03-20

摘要: 华北地台北缘内蒙古中部地区晚古生代前发生过造山后伸展作用,在晚泥盆世-早石炭世,本区经厅了短暂的造山作用,形成前陆盆地并推积了滨浅 海相磨拉石建造,同时伴有同碰撞期花岗岩产生。中石炭世一早二叠世,本区进入造山后的陆内伸展作用阶段,并发育大量火山岩。火山岩碱质含量高,碱质成分中Na2O>K2O,且显示双峰分布特征;碎屑岩成分熟度和结构熟度降低,表明中石炭世一早=叠世本区进人陆内伸展构造发育阶段。

Abstract: Post-orogenic extension had occurred in I ate Paleozoic at northern margin of the North China Platform. The orogeny occurred in late Devonian-Early Carboniferous and foreland basin is formed and accumulated littora1-epicontinental sea facies molasse deposition and formed a lot of synorogenic granites. Intracontinental extension tectonics process occurred in Middle Carboniferous-Early Permian which formed a lot of volcanic rocks. The alkalian content of volconic rocks is high (Na2O> K2O) and the differentiation index of volcanic rocks is characterized by bimodality. Composition and texture maturity of clastic rocks indicates that extensional process occurred from Middle Carboniferous to Early Permian.