华北地质2025，Vol.48Issue(4)：43-53,11.DOI:10.19948/j.12-1471/P.2025.04.04
鄂尔多斯盆地泾川铀矿含矿层黏土矿物特征及其成因研究
Research on the characteristics and genesis of clay minerals in the ore-bearing layer of the Jingchuan uranium deposit,Ordos Basin
摘要
Abstract
[Objectives]The Jingchuan uranium deposit,located on the southwestern margin of the Ordos Basin,is a newly discovered sandstone-type uranium deposit in recent years.Studying the composition,distribution,and genesis of clay minerals in the ore-bearing layer is of great significance for understanding the properties of ore-forming fluids and the mechanism of uranium enrichment.[Methods]In this study,systematic core samples were collected from the ore-bearing Lower Cretaceous Luohe Formation of the Jingchuan uranium deposit.Multiple analytical techniques were employed,including thin-section identification,visible and near-infrared to shortwave infrared(VNIR)spectroscopy,X-ray diffraction(XRD),and scanning electron microscopy with energy-dispersive spectroscopy(SEM-EDS).These methods were used to investigate the macroscopic distribution and microscopic occurrence characteristics of clay minerals in the Luohe Formation and to explore their relationship with uranium mineralization.[Results]The results indicate that the clay minerals in the ore-bearing layer are dominated by smectite(S),illite(I),and illite/smectite mixed-layer(I/S),with minor amounts of kaolinite(K)and chlorite(C).Overall,these minerals reflect primary sedimentary characteristics with weak late-stage alteration.Variations in clay mineral composition were observed among sandstones of different colors.Kaolinite content is higher in grey sandstone and shows a positive correlation with uranium content.[Conclusion]This study reveals the composition and distribution characteristics of clay minerals in the ore-bearing layer and their genetic relationship with uranium mineralization.It provides a scientific basis for further research on the mineralization mechanism and exploration forecasting of this type of uranium deposit.关键词
鄂尔多斯盆地/黏土矿物/泾川铀矿/洛河组/流体作用Key words
Ordos Basin/clay mineral/Jingchuan uranium deposit/Luohe Formation/fluid action分类
天文与地球科学引用本文复制引用
张博,陈印,赵华雷..鄂尔多斯盆地泾川铀矿含矿层黏土矿物特征及其成因研究[J].华北地质,2025,48(4):43-53,11.基金项目
国家自然科学基金委重点支持项目"风成沉积体系砂岩型铀矿成矿作用"(92162212) （92162212）
国家重点研发计划项目"中国北方中、新生代盆地砂岩铀矿成矿预测与增储示范"(2023YFC2906704) （2023YFC2906704）
国家重点研发计划项目"北方砂岩型铀能源矿产基地深部探测技术示范"(2018YFC0604200) Supported by the Key Project of the National Natural Science Foundation of China(92162212) （2018YFC0604200）
National Key Research and Development Program Project(2018YFC060420 （）
2023YFC2906704) （）
