• 全部
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
中条山地区二叠系含煤岩系碎屑锆石年龄及其对区域构造活动的沉积学制约
  • Title

    Detrital zircon ages of the Permian coal-bearing rock series in the Zhongtiao Mountain area and their sedimentological constraints on regional tectonic activity

  • 作者

    吴芳李振宏井向辉寇琳琳杜壮刘博华

  • Author

    WU Fang;LI Zhenhong;JING Xianghui;KOU Linlin;DU Zhuang;LIU Bohua

  • 单位

    中国地质科学院地质力学研究所自然资源部活动构造与地质安全重点实验室自然资源部古地磁与古构造重建重点实验室中国石油长庆油田公司勘探开发研究院低渗透油气田勘探开发国家工程实验室中国地质大学(北京) 地球科学与资源学院

  • Organization
    Institute of Geomechanics, Chinese Academy of Geological Sciences
    Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources
    Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources
    Research Institute of Exploration and Development, Changqing Oilfield Branch Company, PetroChina
    National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields
    School of Earth Sciences and Resources, China University of Geosciences (Beijing)
  • 摘要
    目的

    沉积盆地中碎屑沉积物的物质组成变化与源区的隆升剥蚀过程紧密相关。华北克拉通南缘作为中国大陆的主要构造单元,拥有二叠纪较为完整的地质记录,中条山地区位于华北克拉通南部汾渭地堑系核心部位,物源主要指向华北克拉通南缘及相邻的秦岭造山带,是研究二叠纪时期秦岭造山带及相邻地区构造演化过程的理想场所。

    方法

    通过对华北克拉通南缘中条山地区米汤沟剖面二叠系山西组潮坪−潟湖相含煤岩系及其上覆下石盒子组冲积扇−河流相沉积碎屑锆石U-Pb年代学分析,系统开展沉积物源对比示踪,综合讨论了沉积物源与源区构造作用的相互耦合关系。

    结果和结论

    结果表明:二叠系山西组潮坪−潟湖相含煤岩系碎屑锆石年龄序列具有297、327、443、921、969、1826199022722443 Ma 9个主要峰值;下石盒子组冲积扇−河流相沉积碎屑锆石年龄序列具有305、1755188222842490 Ma 5个峰值,缺少新元古代和早古生代的碎屑锆石年代记录。分析认为二叠系山西组含煤岩系物源主要来自于北秦岭−华北克拉通南缘构造带,下石盒子组沉积物源仅来自于华北克拉通南缘构造带。二者的沉积物源差异响应了早中二叠世华北板块与秦岭−大别板块的相互作用过程,显示构造活动自南向北逐渐迁移。早二叠世早中期,华北南缘整体隆升幅度较低,北秦岭构造带的物源能够进入中条山地区;早二叠世晚期至中二叠世早期,由于华北克拉通南缘的快速抬升,隆升幅度较大,阻隔了南部的北秦岭物源,导致中条山地区不再接受北秦岭的物源供给。研究成果从沉积学角度为华北克拉通南缘及相邻秦岭造山带在二叠纪时期的构造活动过程提供了新的佐证。

  • Abstract
    Objective

    The changes in the material composition of detrital sediments in a sedimentary basin are intimately associated with the uplift and denudation processes of provenance areas. The southern margin of the North China Craton, a primary tectonic unit of the continental area of China, preserves relatively complete geological records of the Permian. The Zhongtiao Mountain area is located in the core of the Fen-Wei graben system on the southern margin of the North China Craton, with the southern margin of the North China Craton and the adjacent Qinling orogenic belt potentially serving as its provenance areas. Therefore, the Zhongtiao Mountain area is an ideal site for exploring the tectonic evolutionary processes of the Qinling orogenic belt and its adjacent areas during the Permian.

    Methods

    This study examined the detrital zircon U-Pb chronology of the coal-bearing rock series of the tidal flat-lagoon facies in the Permian Shanxi Formation and sediments of the alluvial fan-fluvial facies in the overlying Lower Shihezi Formation within the Mitanggou section of the Zhongtiao Mountain area. Then, this study delved into the correlation and tracing of sediment provenance areas. Finally, this study comprehensively explored the coupling between sediment provenance and tectonic processes in the provenance areas.

    Results and Conclusions

    The results indicate that the coal-bearing rock series of the tidal flat-lagoon facies in the Permian Shanxi Formation exhibit nine primary detrital zircon age peaks: 297, 327, 443, 921, 969, 1826, 1990, 2272, 2443 Ma. In contrast, the sediments of the alluvial fan-fluvial facies in the Lower Shihezi Formation manifest five detrital zircon age peaks, namely 305, 1755, 1882, 2284, 2490 Ma, lacking the age records of Neoproterozoic and Eopaleozoic detrital zircons. The analysis reveals that the coal-bearing rock series originate primarily from the North Qinling orogenic belt and the southern margin of the North China Craton. In comparison, the sediments of the alluvial fan-fluvial facies are merely derived from the southern margin of the North China Craton. The differences in sediment provenance respond to the interactions between the North China Plate and the Qinling-Dabie plate during the Early-Middle Permian, suggesting that tectonic activity gradually migrated from south to north. In the early and middle stages of the Early Permian, the overall low uplift of the southern margin of the North China Craton allowed the sediments from the North Qinling orogenic belt to enter the Zhongtiao Mountain area. From the late stage of the Early Permian to the early stage of the Middle Permian, the rapid and significant uplift of the southern margin of the North China Craton blocked the sediments from the North Qinling orogenic belt. As a result, the Zhongtiao Mountain area failed to receive sediment supply from the North Qinling orogenic belt. This study provides new sedimentological evidence for the Permian tectonic processes of the southern margin of the North China Craton and the adjacent Qinling orogenic belt.

  • 关键词

    含煤岩系锆石年代学华北克拉通秦岭造山带沉积物源

  • KeyWords

    coal-bearing rock series;zircon chronology;North China Craton;Qinling orogenic belt;sediment provenance

  • 基金项目(Foundation)
    中国地质调查局地质调查项目 (DD20221644);国家自然科学基金项目 (41972119)
  • DOI
  • 图表
    •  
    •  
    • 研究区区域大地构造位置及区域地质

    图(8) / 表(2)

相关问题

主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

©版权所有2015 煤炭科学研究总院有限公司 地址:北京市朝阳区和平里青年沟东路煤炭大厦 邮编:100013
京ICP备05086979号-16  技术支持:云智互联