塔里木盆地古生代关键期构造演变驱动机制:来自柯坪地区碎屑物源属性示踪的约束  

Driving Mechanism of Tectonic Evolution in Key Paleozoic Period in Tarim Basin:Constraints from Tracing of Provenance Attributes in Keping Area

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作  者:郭春涛 高剑[3,4] 李忠[3,5] Guo Chuntao;Gao Jian;Li Zhong(The Cultivation Base of Shanxi Key Laboratory of Mining Area Ecological Restoration and Solid Wastes Utilization,Yangquan 045000,China;Department of Earth Sciences and Engineering,Shanxi Institute of Technology,Yangquan 045000,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Beijing Institute of Geothermal Research,Beijing 100143,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区:[1]矿区生态修复与固废资源化厅市共建山西省重点实验室培育基地,山西阳泉045000 [2]山西工程技术学院地球科学与工程系,山西阳泉045000 [3]中国科学院地质与地球物理研究所,北京100029 [4]北京市地热调查研究所,北京100143 [5]中国科学院大学地球与行星科学学院,北京100049

出  处:《地球科学》2024年第11期4112-4129,共18页Earth Science

基  金:国家自然科学基金项目(Nos.40972085,41372120);山西省高等学校科技创新项目(No.2021L590);山西省基础研究计划项目(No.202203021211287);来晋工作优秀博士项目(No.2021PT-12).

摘  要:古生代塔里木盆地多期构造格局变迁的动力来源一直是众多学者争议的焦点,特别是早古生代中晚期盆地构造格局发生急剧转变的原因.在重矿物组合分析基础上,针对塔里木盆地西北缘柯坪地区的芙蓉统至下二叠统砂岩样品进行了详细的碎屑锆石U-Pb年代学研究,以此厘定了柯坪地区物源体系,并刻画了该地区的沉积构造演化过程.结果表明,碎屑锆石样品记录了500~420 Ma、870~710 Ma、1100~880 Ma、2000~1710 Ma、2570~2400 Ma共5期构造热事件,并以前3期年龄为主体.对比潜在物源区,芙蓉世塔里木盆地内的古隆起一直是柯坪地区重要的物源区;志留‒泥盆纪研究区的物源除了盆地古隆起外,还可能存在两个物源区,北侧物源区为塔里木克拉通北缘,南侧可能为西昆仑造山带;石炭纪‒早二叠世研究区的主物源为盆地古隆起,来自于之前地层的剥蚀.综合研究认为,在中晚奥陶世,古天山洋逐渐开始向南俯冲,在塔里木克拉通北缘形成一系列与俯冲相关的岛弧,中天山地块逐渐从塔里木克拉通分离,在两者中间逐渐形成南天山洋,一直到中晚泥盆世中天山地块才完全与塔里木克拉通分开.与此对应,由于塔里木克拉通北侧洋盆的形成和俯冲闭合,导致盆地北缘的构造属性发生多次大的转变.The dynamic source of the Paleozoic multistage tectonic pattern changes in Tarim basin,especially the reason for the sharp change of the basin tectonic pattern in the Middle and Late Early Paleozoic,has always been the focus of controversy among many scholars.Based on the analysis of heavy mineral assemblages,in this paper it conducts a detailed U-Pb chronological study of detrital zircons from the Furongian to the Cisuralian sandstone samples in Keping area,northwest margin of Tarim basin,in order to determine the provenance system of Keping area,and describe the sedimentary tectonic evolution process of this area.The results show that the detrital zircon samples recorded five tectonic thermal events at 500-420 Ma,870-710 Ma,1100-880 Ma,2000-1710 Ma,and 2570-2400 Ma,with the previous three periods being the main age.Compared with the potential provenance areas,the palaeouplift in Tarim basin has always been an important provenance area in Keping area during the Furongian;In addition to the palaeouplift within the basin,there may also be two source areas during the Silurian to the Devonian.The northern source area is the northern margin of the Tarim craton,and the southern source area may be the West Kunlun orogenic belt.The main source of study area is the palaeouplift within the basin during the Carboniferous to the earliest Permian,which originated from the erosion of previous strata.Comprehensive research suggests that the Middle Tianshan terrane may have been connected to the Tarim craton before the Early and Middle Devonian.After this period,the Middle Tianshan terrane gradually separated from the Tarim craton,and the South Tianshan Ocean gradually formed.Correspondingly,due to the formation,subduction,closure of the ocean basin on the north side of the Tarim craton,the structural attributes of the northern margin of the basin have undergone multi-stage changes.

关 键 词:柯坪 古生代构造演化 碎屑锆石 物源体系 构造演化 U-PB 同位素 构造地质. 

分 类 号:P542[天文地球—构造地质学] P597[天文地球—地质学]

 

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