世界核地质科学2025，Vol.42Issue(5)：916-928,13.DOI:10.3969/j.issn.1672-0636.2025.05.002
银额盆地天草凹陷中次凹断陷层构造特征与找矿方向分析
The structural characteristics and ore prospecting direction of central sag in Tiancao depression,Yingen-Ejin basin
摘要
Abstract
The central sag in the Tiancao depression bears the characteristics of large scale,complex structure,ample sediment supply,and deep subsidence,forms relatively favorable conditions for uranium mineralization.Preliminary drilling verification has identified relatively high-grade uranium mineralization within the Lower Cretaceous Suhongtu formation.However,due to the low level of uranium geological exploration and scientific research,and the uranium prospecting potential is yet unclear to be clearly.Therefore,conducting an analysis of uranium metallogenic conditions and prospectivity prediction is essential for delineating uranium exploration targets within the Tiancao depression and facilitate the breakthroughs in discovering new areas and new stratigraphic horizons for uranium exploration in the Yingen-Ejin basin.Commencing with an analysis of fundamental geological data and utilizing seismic interpretation and balanced cross-section restoration techniques,this study elucidated the structural architecture and tectonic characteristics of the central sag,reconstructed its structural evolution history.Based on this foundation,a detailed analysis of the structural controls on uranium mineralization within the sag was conducted.Research indicated that the middle sag had an asymmetric graben structure.The structure and tectonics of the sag controlled the development of favorable facies zones and the distribution of sand bodies.The fault system controlled the activities of ore-forming fluids.The uplift inversion and regional unconformity control the epigenetic transformation.A gently dipping fault terrace structure has developed on the northwestern slope of the sag.The fault system is well-developed,the sedimentary facies belts and sand bodies are characterized by significant scale,creating overall advantageous conditions for mineralization.Consequently,one Class II prospective area has been prioritized.关键词
银额盆地/天草凹陷/构造特征/构造演化/砂岩型铀矿Key words
Yingen-Ejin basin/Tiancao sag/structural features/tectonic evolution/sandstone-type uranium deposit分类
天文与地球科学引用本文复制引用
贾立城,刘武生,李真真,杨喆,史清平,李伟涛..银额盆地天草凹陷中次凹断陷层构造特征与找矿方向分析[J].世界核地质科学,2025,42(5):916-928,13.基金项目
核技术研发项目(编号:地H2401)资助 Supported by Nuclear Technology R&D Program(No.地H2401) （编号:地H2401）
