南天山区域大地构造与演化  

Tectonic Framework and Evolution of South Tianshan,NW China

作　　者：李曰俊[1] 杨海军[2] 赵岩[1] 罗俊成[2] 郑多明[2] 刘亚雷[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油塔里木油田公司,新疆库尔勒841000

出　　处：《大地构造与成矿学》2009年第1期94-104,共11页Geotectonica et Metallogenia

基　　金：国家“973”项目(编号2006CB202301);中国科学院知识创新工程重要方向项目(编号:KZCX3-SW-147);国家“十五”重点科技攻关项目(编号:2004BA616A02)共同资助

摘　　要：塔里木和中天山之间的南天山造山带,经历了复杂的构造演化与地壳增生过程。综合分析南天山造山带的构造、地层、古生物、岩石、地球化学和同位素年代学等方面的资料,特别是放射虫、蛇绿岩、蓝片岩等方面的最新研究成果,讨论了南天山的区域构造格局和演化过程。南天山主体为一上百公里宽的增生-碰撞混杂带-南天山(蛇绿)混杂带;其北侧为中天山岛弧,是仰冲壳楔;南侧为塔里木陆块,是俯冲壳楔。古南天山洋为一广阔的大洋,南天山碰撞造山作用起始于二叠纪末-三叠纪初,新近纪-第四纪进入陆内造山作用阶段。Chinese South T （Middle Tianshan for short ianshan （South Tianshan for short） orogen between Tarim and Chinese Middle Tianshan ） has undergone complicate tectonic evolution, especially, the fore-arc accretion during the oceanic crust subduction of the ancient South Tianshan ocean under the Middle Tianshan volcanic arc. Traditionally, South Tianshan has been considered as a Hercynian fold belt, and mostly as the passive margin of Tarim. We summarize and discuss the data of radiolarian fossil, ophiolite （melange） , high-pressure metamorphic belt, stratigraphy, deposits in the peripheral foreland basin and deformation in South Tianshan. The results indicate that： （1） The major part of South Tianshan is a large （ophiolite） melange with over 100km in width, which comprises dominantly of the accretionary wedge and also some collision complex; （2） South Tianshan is an Indo-Sinian orogen derived from the collision between Tariin and Middle Tianshan in the late Permian-Early Triassic; （3） Middle Tianshan overthrusted onto the northern margin of Trim and formed Kuqia peripheral foreland basin during the collision; （4） The ancient South Tianshan Ocean is a vast oceanic basin; （5） Middle Tianshan is the front volcanic arc of South Siberian archipelago; （6） Northern Tarim crust subducted intra-continently under Middle Tianshan in the N-Q, and formed the Northern Tarim neo-foreland basin; （7） Kuqia peripheral foreland basin and Northern Tarim Neo-foreland basin constitute a dual foreland basin of a continental collision orogen.

关 键 词：中国南天山 (蛇绿)混杂带 增生楔 放射虫化石 高压变质带 火山弧 前陆盆地 碰撞造山 印支造山带 

分 类 号：P542[天文地球—构造地质学]