地质与资源2026，Vol.35Issue(2)：141-149,177,10.DOI:10.13686/j.cnki.dzyzy.2026.02.002
内蒙古化德地区三面井组沉积地质特征
Sedimentary characteristics of Sanmianjing Formation in Huade area,Inner Mongolia:Constraints on the tectonic evolution of the southern margin of Xing'an-Mongolia orogenic belt
摘要
Abstract
The Huade area in Inner Mongolia is located at the southern extremity of the central segment of Xing'an-Mongolia Orogenic Belt.The Permian marine strata exposed in this area serve as ideal repositories for studying the tectonic evolution of Paleo-Asian Ocean.In this study,multiple methods including paleontology,zircon U-Pb geochronology and sandstone framework grain analysis were employed to investigate the Sanmianjing Formation in Huade area.The results show that the Sanmianjing Formation represents a transgressive succession deposited in littoral to neritic environments,containing Early-Middle Permian fusulinid fossils.The youngest detrital zircon age from the sandstones is 274±6 Ma,defining the minimum depositional age of Sanmianjing Formation.The detrital zircons exhibit three main age populations:274-338 Ma,1 567-2 193 Ma,and 2 310-2 656 Ma,indicating a mixed provenance of a magmatic arc related to the subduction of Paleo-Asian Ocean and the basement of North China Craton.The framework grain compositions and mineral assemblages of the sandstones further show that the tectonic affinity of the provenance includes both a magmatic arc and a stable craton or uplifted basement.Integrated with regional geological data,these results reveal that the Sanmianjing Formation was deposited during the Early Permian and originated in a back-arc basin,further suggesting that during the Early Permian,the Paleo-Asian Ocean was still subducting southward beneath the North China Block.These findings provide new foundational data for understanding the tectonic evolution of Xing'an-Mongolia orogenic belt.关键词
三面井组/沉积特征/原型盆地/兴蒙造山带/内蒙古Key words
Sanmianjing Formation/sedimentary characteristics/prototype basin/Xing'an-Mongolia orogenic belt/Inner Mongolia分类
天文与地球科学引用本文复制引用
李利阳,李新发,刘博,张传恒..内蒙古化德地区三面井组沉积地质特征[J].地质与资源,2026,35(2):141-149,177,10.基金项目
中国地质调查局项目"内蒙古化德-河北康保德包图等4幅1∶5万区域地质调查项目"(DD20208003) （DD20208003）
东北地质科技创新中心区创基金项目"东北大兴安岭地区乌奴耳蛇绿岩年代学序列及成因研究"(QCJJ2024-28) （QCJJ2024-28）
宿州学院博士科研启动基金项目"巢湖地区二叠-三叠纪界线附近生命与环境的协同演化:以有孔虫为例"(2021BSK036). （2021BSK036）
