Detrital zircon ages of the Permian coal-bearing rock series in the Zhongtiao Mountain area and their sedimentological constraints on regional tectonic activity
WU Fang;LI Zhenhong;JING Xianghui;KOU Linlin;DU Zhuang;LIU Bohua
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
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。
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、
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.
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.
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,
coal-bearing rock series;zircon chronology;North China Craton;Qinling orogenic belt;sediment provenance
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