甘肃内蒙古北山地区古生代地壳演化
Crustal evolution of Palaeozoic in Beishan area, Gansu and Inner Mongolia, China
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摘要: 甘肃、内蒙古北山地区从寒武纪初期在前震旦纪统一古陆壳的基础上发生裂解,到石炭纪末洋盆最终闭合形成新的统一大陆,先后经历了两期板块构造体制和两次主要的俯冲—碰撞造山作用。其中,第一期板块构造体制出现在早古生代(O2—S3),沿红柳河—牛圈子—洗肠井一带裂解形成洋盆,晚奥陶世—志留纪发生由南向北俯冲,志留纪末大洋封闭;第二期板块构造体制出现在晚古生代中期(C),随着早石炭世初期红石山—百合山—蓬勃山有限大洋的发育,分割了哈萨克斯坦板块和塔里木板块,石炭纪末结束了板块构造格局,形成了新的统一大陆,自此以后北山地区进入陆内演化。石炭—二叠纪北山地区南部还出现了陆内裂谷、裂陷槽及断陷盆地等一系列扩张机制。Abstract: The AnZ ancient continent was been splited from the Early Cambrian in Beishan area bounded by Gansu and Inner Mongolia, China. The oceanic basin was finally been closed to form a new unified continent in the end of Carboniferous, went through two periods of plate tectonic system and two times of main underthrust-collision orogeny. The first period of plate tectonic system occured in Early Palaeozoic(O2~S3), Kazakhstan plate and Tarim plate were firstly divided along Hongliuhe-Niujuanzi-Xichangjing. The oceanic crust underthrusted from south to north in Late Ordovicain-Silura in and the oceanic basin was been closed to forma unified continent again in the end of Silurain. The second one took place in the middle period of Late Palaeozoic(C),Kazakhstan plate and Tarim plate were secondly divided,following the formation of Hong shishan-Baiheshan-Pengbo shan seconddary ocean. The plate tectonic frame had been concluded in the end of Carboniferous,and a new unified continent had been formed. After this,Beishan area got into intracontinental evolution,and appea red a series of spreading mechanismin Carboniferous-Permian,such as intracontinental rifts,chasmic trough,faulted basins,and so on.
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Keywords:
- Beishan area /
- Palaeozoic /
- plate tectonic system /
- orogenesis
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