松辽盆地东北部拜泉地区姚家组砂岩型铀成矿条件与找矿方向探讨  

Discussion on Metallogenic Conditions and Prospecting Direction of Sandstone-type Uranium Deposits in Yaojia Formation, Baiquan Area,Northeast Songliao Basin

作　　者：张航 聂逢君[2,3] 罗敏 赵忠华 张成勇[2] 赵星博 ZHANG Hang;NIE Fengjun;LUO Min;ZHAO Zhonghua;ZHANG Chengyong;ZHAO Xingbo(Research Institute No.240,CNNC,Shenyang,Liaoning 110032,China;School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China;State Key Laboratory of Nuclear Resources and Environment,East China Institute of Technology,Nanchang,Jiangxi 330013,China)

机构地区：[1]核工业二四〇研究所,辽宁沈阳110032 [2]东华理工大学地球科学学院,江西南昌330013 [3]东华理工大学核资源与环境国家重点实验室,江西南昌330013

出　　处：《铀矿地质》2022年第3期425-435,共11页Uranium Geology

基　　金：中国核工业地质局松辽盆地生产中科研项目(编号:202125-4)资助。

摘　　要：松辽盆地是我国大型的能源盆地,近年来在盆地南部砂岩型铀矿找矿取得重大突破,但针对北部姚家组砂岩型铀矿成矿条件研究还相对薄弱。文章通过大量岩心观察、单井-连井剖面综合分析,运用沉积学和砂岩型铀矿找矿理论分析,对松辽盆地东北部拜泉地区姚家组砂岩型铀成矿条件进行系统梳理:拜泉地区周边东侧反转构造较发育,地层抬升明显,且抬升后受到强烈剥蚀,致使构造“天窗”发育,反转构造改变地下水的循环状态,有利于成矿期含铀含氧水的渗入;姚家组共发育两层砂体,上、下存在稳定的隔水泥岩,砂体连通性较好,灰色砂岩中富含有机质,具备形成层间氧化带砂岩型铀矿的地层及砂体条件;姚家组主要为岩屑长石砂岩,砂体存在不同程度的高岭石化、褐铁矿化、绿泥石化等蚀变,有机质丰富。综合分析认为拜泉-三道镇地段具备良好的砂岩型铀矿找矿潜力,该研究为松辽盆地北部砂岩型铀矿找矿提供一定依据。Songliao Basin is a large energy base in China and great achievement has reached in the sandstone-type uranium deposit exploration in the south of the basin. However, few study was finished in northern Songliao Basin on the metallogenic conditions of the same host rocks of Yaojia Formation. Based on large number of cores observation, comprehensive analysis of single, neighbor boreholes and thin section analysis,theoretical analysis of sedimentology and prospecting for sandstone-type uranium deposits, this paper systematically summarized the metallogenic conditions of sandstone-type uranium deposits in Yaojia Formation in Baiquan area, northeast Songliao Basin. The structures are well developed in Baiquan area,especially the inverted structures in the east, the strata are obviously uplifted, and after uplifting, they were denuded strongly, which lead to the development of the fenster. Structural inversion has changed the circulation of groundwater, which fostered the infiltration of uranium-bearing and oxygen-bearing water in the metallogenic period. There are two layers of sand bodies in Yaojia Formation. The gray sandstone is rich in organic matter with good connectivity. There are relatively stable mudstone aquifuge in the upper and lower layer, which have the lithology and sand body conditions for sandstone-type uranium deposits of interlayer oxidation zone. The Yaojia Formation is mainly lithic feldspar sandstone, which is in different alteration with kaolinite, limonite and chloritization, but rich in organic matter. Comprehensively analysis believed that there is good prospecting potential of sandstone-type uranium deposits in the fluvial gray sand bodies in Baiquan-Sandao town.

关 键 词：砂岩型铀矿 成矿条件 姚家组 拜泉地区 松辽盆地东北部 

分 类 号：P619.14[天文地球—矿床学]