塔里木新元古代裂谷盆地基底结构与演化  

Basement Architecture and Evolution of Neoproterozoic Tarim Rift Basin

作　　者：陈利新[1,2] 贾承造[1] 邬光辉[3] 黄少英 杨率[3] 陈永权 苏洲[2] Chen Lixin;Jia Chengzao;Wu Guanghui;Huang Shaoying;Yang Shuai;Chen Yongquan;Su Zhou(Unconventional Gas Research Institute,China Petroleum University,Beijing 102249,China;PetroChina Tarim Oilfield Company,Korla 841000,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [2]中国石油塔里木油田分公司,新疆库尔勒841000 [3]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《地球科学》2024年第10期3445-3458,共14页Earth Science

基　　金：国家自然科学重点基金项目(Nos.91955204,4224100017);中国石油天然气股份有限公司科技重大专项(No.2018E-1806)。

摘　　要：沉积盆地基底结构与演化是盆地动力学研究的重要内容,针对塔里木板块新元古代变质基底与裂谷盆地成因机制问题,综合新元古代年代学与地球化学资料研究其基底结构、构造环境与演化.结果表明,南、北塔里木地块拼合于1.9~1.8 Ga,早新元古代沉积岩系与古元古代火成岩系于780~750 Ma形成统一的变质基底,并经历多期构造-热事件作用形成南北差异的复杂变质基底结构.新元古代具有950~900 Ma、860~840 Ma、830~800 Ma、780~760 Ma的多期前展式俯冲作用,760~720 Ma、670~610 Ma的多期后撤俯冲作用,形成了转换期在约760 Ma的前展-后撤俯冲构造旋回.新元古代前展式俯冲控制了变质基底的演变,后撤俯冲控制了大陆裂谷盆地的演化,具有不同于经典威尔逊旋回的成盆动力学机制与演化过程.The basement architecture and evolution is of important role in dechipering sedimentary basin dynamitics.Based on the compiled geochronological and geochemical data,it has a review on the hot debates on the basement architecture,tectonic environment and evolution of the Neoproterozoic Tarim Basin.The results show that the southern and northern Tarim terranes are assemblied during 1.9-1.8 Ga,and the Early Neoproterozoic sedimentary succession and Paleoproterozoic igneous succession are composed to form a unified metamorphic basement during 780-750 Ma,and to form a complex metamorphic basement structure with differences between northern and southern terranes by multi-stage tectonic-thermal events.The Neoproterozoic was characterized by multi-stage of advancing subduction at ca.950-900 Ma,860-840 Ma,830-800 Ma,780-760 Ma,and multi-stages of retreating subduction at ca.760-720 Ma,670-610 Ma,which resulting in a Neoproterozoic advancing-retreating subduction cycle with the switch at ca.760 Ma.The Neoproterozoic advancing subduction controlled the origin and evolution of the metamorphic basement,and the subsequent retreating subduction controlled the initiation and evolution of continental rift basin,which suggests a different basin dynamic mechanism and evolutionary process from the classical Wilson cycle.

关 键 词：塔里木 新元古代 基底结构 俯冲机制 裂谷盆地 演化 构造地质学 

分 类 号：P581[天文地球—岩石学]