隐伏砂岩型铀矿成矿机理与成矿地质信息识别研究进展  

Research Progress on Metallogenic Mechanism and Information Identification Technique of Sandstone Type Uranium Deposit

作　　者：易超[1] 刘红旭[1] 蔡煜琦[1] 张玉燕[1] 李林强[1] 李西得[1] 张康[1] 丁波[1] 李平[1] YI Chao;LIU Hongxu;CAI Yuqi;ZHANG Yuyan;LI Linqiang;LI Xide;ZHANG Kang;DING Bo;LI Ping(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,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

出　　处：《铀矿地质》2020年第2期73-83,共11页Uranium Geology

基　　金：中国核工业地质局铀矿科研项目“鄂尔多斯盆地重点地区砂岩铀矿成矿作用与新区预测研究”(编号:2019027);中核集团集中研发项目(龙腾二期)下设专题“鄂尔多斯盆地北部砂岩型铀矿关键因素识别与靶区优选”(编号:地LTD1601-2)资助。

摘　　要：通过对鄂尔多斯盆地北部及伊犁盆地南缘典型铀矿床成矿机理及成矿信息的研究,进一步厘定了鄂尔多斯盆地北部铀成矿期次及成矿过程;构建了伊犁盆地南缘"中西段稳定斜坡带继承性叠加富集成矿、中东段强构造改造背景下叠加改造成矿"的铀成矿模式;总结了以构造、建造和铀源为判别依据的砂岩型铀矿有利成矿区带及成矿环境的识别标志,以地层结构、沉积(微)相、铀源、后期改造等多要素耦合的有利目标层识别标准,以砂体成因类型、发育规模、还原容量、岩性组合、地层产状等多要素耦合的有利成矿砂体判别标准,以鄂尔多斯盆地北部为例,厘定了其古层间氧化带不同分带砂岩的地球化学指标模式。综合分析两片研究区的成矿机理及成矿信息,结合实际勘查进展,预测并优选了多片铀成矿远景区,进一步拓展了两片研究区的找矿空间。By studying the metallogenic mechanism and metallogenic information of the typical uranium deposits in the northern Ordos basin and the southern Yili basin, the "superposition uranium metallogenic model" in the northern Ordos basin was supplemented and improved, and a uranium metallogenic model was constructed for the southern Yili basin, where the uranium mineralization was inherited in the west segments and superimposed and enriched in the stable slope, while mineralization in the mid￣east segments was superimposed and transformed under strong tectonic transformation". In this paper, the identification marks of favorable metallogenic zone and metallogenic environment for sandstone type uranium deposits were summarized based on the tectonic, strata construction and uranium sources, the identification standards of the favorable target layer were summarized as multi￣factor coupling, such as stratigraphic structure,sedimentary( micro) facies, uranium source and later transformation, the discriminant standards of the favorable ore￣forming sand bodies were recognized as multi￣element coupling, such as the genetic types of sandbody, development scale, reduction capacity, lithology structure, and formation occurrence, and the geochemical index pattern of different zonal sandstone in the paleo interlayer oxidation zone was determined in the case study of the northern margin of Ordos basin. Based on the comprehensive analysis of metallogenic mechanism and metallogenic information of the two research areas, many prospective areas for uranium mineralization were predicted, with actual exploration progress. Those prospective areas have further expanded the prospecting space for the two research areas.

关 键 词：成矿模式 成矿信息识别 砂岩型铀矿 鄂尔多斯盆地北部 伊犁盆地南缘 

分 类 号：P612[天文地球—矿床学]