鄂尔多斯盆地西南部镇原地区志丹群铀矿石物质组成特征  

Material Composition Characteristics of Uranium Ore of Zhidan Group in Zhenyuan Area,Southwest Ordos Basin

作　　者：张字龙[1] 贺锋[1] 李子颖[1] 刘鑫扬 武正乾 刘坤鹏 刘持恒 李西得[1] 张艳 ZHANG Zilong;HE Feng;LI Ziying;LIU Xinyang;WU Zhengqian;LIU Kunpeng;LIU Chiheng;LI Xide;ZHANG Yan(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China;China Nuclear Geology Bureau,Beijing 100013,China;Research Institute No.203,CNNC,Xi’an,Shanxi 710086,China)

机构地区：[1]核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室,北京100029 [2]中国核工业地质局,北京100013 [3]核工业二〇三研究所,陕西西安710086

出　　处：《铀矿地质》2023年第6期892-903,共12页Uranium Geology

基　　金：中国核工业地质局项目(编号:202201-08);中核集团集中研发项目(编号:中核科发2021-143号);中核集团青年英才项目(编号:地QNYC2301)联合资助。

摘　　要：文章重在全面、客观、详实地描述鄂尔多斯盆地镇原地区下白垩统环河组和洛河组赋矿砂岩结构、构造和砂岩中的物质组成及分布特征,旨在为阐明该地区铀成矿机理提供基础信息。通过钻孔岩心观察赋矿岩石岩性、沉积结构和构造特征,利用扫描电镜及电子显微镜对不同颜色赋矿岩石中的铀矿物、金属矿物、非金属矿物、黏土矿物及有机质等物质成分进行系统观察和鉴定,发现不同颜色赋矿砂岩中物质组成各有差异,矿石中可见多种铀矿物、金属矿物、非金属矿物,见少量黏土矿物和有机质。认为赋矿砂岩主要为近源水系沉积物,铀成矿过程具有多种成矿流体来源,成矿作用既有渗入成矿作用,也有深部渗出成矿作用。This paper focuses on a comprehensive,objective and detailed description of the texture,structure and material composition and distribution of the host sandstones in the Huanhe and Luohe Formations of the Lower Cretaceous in the Zhenyuan area of Ordos Basin.The purpose of this paper is to provide basic information for elucidating the mechanism of uranium mineralization in this area.The lithology,sedimentary structure and structural characteristics of ore-bearing rocks were observed by drilling cores,and the compositions of uranium minerals,metallic minerals,non-metallic minerals,clay minerals and organic matter in different color ore-hosting rocks were systematically observed and identified by scanning electron microscopy and electron microscopy.It was found that the composition of materials in different color ore-bearing sandstone was different.There were many kinds of uranium minerals,metallic minerals and non-metallic minerals in the ore,and a little clay minerals and organic matter.It was considered that the ore-bearing sandstones are mainly the sediments of near-source water system,the uranium ore-forming process has many sources of ore-forming fluids,and the mineralization is not only infiltration mineralization,but also deep seepage mineralization.

关 键 词：物质成分 砂岩型铀矿 成矿作用 下白垩统 鄂尔多斯盆地 

分 类 号：P619.14[天文地球—矿床学]