摘要
在早古生代,三塘湖地区是吐哈地块的组成部分,位于地块北缘,具有弧—沟—盆系统的结构特征。到志留纪末期,阿尔曼太古洋盆发生闭合碰撞作用形成了阿尔曼太碰撞带。进入早泥盆世,在吐哈地块北部、三塘湖地区早古生代岛弧南侧发生裂解、扩张作用,形成了克拉麦里古洋盆,从而使三塘湖地块从吐哈地块中分裂出来。在中泥盆世—早石炭世时期,克拉麦里古洋盆发生双向俯冲作用,北侧的三塘湖地块再次形成火山弧火山—沉积建造,南侧形成了哈尔里克火山弧及弧后裂谷盆地并接受相应的火山沉积岩系;早石炭世末期,克拉麦里古洋盆发生持续时间较为短暂的闭合碰撞作用,形成了克拉麦里碰撞带,之后进入后碰撞伸展演化阶段;至晚石炭世,该碰撞带又发生拉开,形成后造山伸展裂谷。结合石炭纪—二叠纪构造岩浆事件,以及构造地质学、沉积学的一些证据研究认为,早石炭世三塘湖盆地及其周缘原型盆地为岛弧环境(弧后盆地);晚石炭世三塘湖盆地南缘及其相邻区域发育后造山伸展裂谷,大约以三塘湖盆地石头梅潜伏隆起及其以东为界,东部为大黑山裂谷,西部为石头梅裂谷。
In early Paleozoic,Santanghu basin which was located at north margin of Tu-Ha block had structural arrangement of arc-trench-basin.At end of Silurian,close and collision of paleo-ocean caused formation of Aermantai collision.Splitting and expanding at south of Santanghu at early Devonian happened,resulting in Kelamaili paleo-ocean formation and separation of Santanghu block from the Tu-Ha block.Within the middle Devonian and early Carboniferous,the Kelamaili palaeo-ocean accepted double subduction,at north of which volcanic arc sediments occurred in Santanghu block,at south of which Haerlike volcanic arc and retroarc rifted basin also accepted volcanic-sediments.At end of early Carboniferous,short time collision of the Kelamaili palaeo-ocean resulted in the Kelamaili collision belt formation,and then the post-collisional extension started.At late Carboniferous,the collision belt was pulled apart,associated with formation of postorogenic extensional rift.In combination with tectonic-magma cases within Carboniferous and Permian,structural and sedimentary evidences gave a proposal that the prototype basin of Santanghu and its surrounding at early Carboniferous would be island arc（retroarc basin）,and postorogenic extensional rift at southern Santanghu basin and its surrounding happened at late Carboniferous.The Santanghu basin was divided into two parts by Shitoumei burial dome,at east of which it was Daheishan rift,at west of which it was Shitoumei rift.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2010年第6期947-954,共8页
Natural Gas Geoscience
基金
国家自然科学基金项目(编号:41072106)资助
关键词
原型盆地
构造演化
裂谷盆地
古生代
三塘湖盆地
Prototype basins
Structural evolution
Rift basin
Paleozoic
Santanghu basin
作者简介
刘兴旺（1983），男，甘肃金塔人，博士研究生，主要从事含油气盆地构造地质学方面的研究．E—mail：liuxingwang@foxmail．com．
