砂岩型铀矿的矿体形态特征及其成因探讨  

Discussion on the Shapes and Their Genesis of Ore Body in Sandstone type Uranium Deposits

作　　者：封志兵[1,2,3] 聂逢君 夏菲[2,4] 李满根[2,4] 江丽[3] 张虎军 严兆彬[2,4] 张成勇[2,4] 张鑫[2,4] FENG Zhibing;NIE Fengjun;XIA Fei;LI Mangen;JIANG Li;ZHANG Hujun;YAN Zhaobin;ZHANG Chengyong;ZHANG Xin(Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology,East China University of Technology,Nanchang,Jiangxi 330013,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang,Jiangxi 330013,China;School of Geophysics and Measurement-Control Technology,East China University of Technology,Nanchang,Jiangxi 330013,China;School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China;Geologic Party No.216,CNNC,Wulumuqi,Xinjiang 830011,China)

机构地区：[1]东华理工大学江西省放射性地学大数据技术工程实验室,江西南昌330013 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [3]东华理工大学地球物理与测控技术学院,江西南昌330013 [4]东华理工大学地球科学学院,江西南昌330013 [5]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2021年第6期981-990,共10页Uranium Geology

基　　金：国家自然科学基金项目(编号:U2067202、41862010、41172058、42172098);江西省放射性地学大数据技术工程实验室开放基金项目(编号:JELRGBDT202007);中核集团龙灿工程科研项目(编号:地LCEQ01);核资源与环境国家重点实验室开放基金项目(编号:NRE1809);江西省自然科学基金项目(编号:20202BAB213017);江西省教育厅科技计划项目(编号:GJJ170480)联合资助。

摘　　要：中国多数砂岩型铀矿床的矿体形态多样,并非仅呈卷状、板状,这有别于典型的砂岩型铀矿成矿模式成因。文章基于铀矿体形态特征,结合地质背景和铀矿床特征,深入地分析了不同形态铀矿体的成因。卷状铀矿体多形成于相对稳定的构造抬升环境,赋矿砂体具有厚度大、致矿物质(有机质、黏土矿物等)分布相对均匀等特点,而板状及其他形状的铀矿体多形成于多因素耦合且多变的成矿环境中。多期次、多源性的构造活动及其衍生效应、赋矿层位的非均质性和多因素叠加成矿作用等都会对铀矿体形态产生深刻影响。另外,人为因素对铀矿体形态的确定也不可忽略。Most of uranium ore bodies of sandstone-type uranium deposits in China are diverse in shape,rather than roll or tabular,which is distinguished from formation of tyical metallogenic models of sandstone type uranium eposits.In this paper,genesis of different shapes of ore bodies was discussed in-depth based on the shapes of ore bodies,combined with geologic setting and uranium deposit features.In general,roll-shaped uranium orebodies were formed in a relatively stable tectonic setting with structure uplifting and the hosting sandstone are with features of large thickness,homogeneous distribution of materials related to uranium mineralization(i.e.,organic matter and clay minerals).While,tabular-shaped uranium orebodies were formed in an unstable tectonic setting,and influenced by multi-factors related to uranium mineralization.Multiple stages and sources tectonic activities and their derivative effects,heterogeneity of uranium-bearing sandstone,and multi-factors related to uranium mineralization could reshape uranium orebodies.In addition,human factors should not be neglected in determination of uranium orebody shapes.

关 键 词：砂岩型铀矿 铀矿体 矿体形态 成矿作用 层间氧化带 

分 类 号：P619.14[天文地球—矿床学]