鄂尔多斯盆地东北部铀成矿地质特征与区域成矿规律  

Geological Characteristics and Regional Metallogenic Pattern of Uranium Mineralization in Northeastern Ordos Basin

作　　者：刘鑫扬 贺锋[1] 剡鹏兵 张字龙[1] 鲁超 任志勇 骆效能 张艳 LIU Xinyang;HE Feng;YAN Pengbing;ZHANG Zilong;LU Chao;REN Zhiyong;LUO Xiaoneng;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;Geological Party No.208,CNNC,Baotou,Inner Mongolia 014010,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]核工业二〇八大队,内蒙古包头014010

出　　处：《铀矿地质》2022年第3期373-393,共21页Uranium Geology

基　　金：中核集团集中研发项目“砂岩型铀矿多重耦合地质成矿作用与时空定位”(编号:中核科发2021-143号);中国核工业地质局基础地质项目“甘蒙地区砂岩型铀矿综合编图与选区”(编号:202118)联合资助。

摘　　要：文章在充分总结前人研究成果的基础之上,分别从铀源特征、构造特征、沉积特征、古水文特征、古气候特征和古层间氧化带特征等方面阐述了鄂尔多斯盆地东北部区域铀成矿地质特征,归纳了赋矿砂岩的岩性特征和区域铀矿化特征,总结了区域铀成矿规律,认为在具备丰富的铀源条件和稳定成矿构造环境条件下,铀成矿主要与赋矿层沉积体系类型、砂体及其空间分布、砂体后生蚀变分带(古层间氧化-还原分带)、砂体中的还原性介质、水动力条件、地层结构及砂体的非均质性、岩石地球化学环境等因素息息相关。建议今后在铀矿地质勘查和科研工作中应重点关注这些与铀成矿相关的地质因素,但在不同的成矿地质环境中应有所侧重,厘定关键控矿要素,实现新的找矿突破。Based on fully summing up the previous research results, the geological characteristics of uranium mineralization in the northeastern Ordos Basin were expounded from the aspects of uranium source characteristics,structural characteristics, sedimentary characteristics, palaeohydrological characteristics, palaeoclimate characteristics and interlayer oxygen zone characteristics in this paper. The characteristics of sandstone lithology and regional uranium mineralization, the regional uranium metallogenic pattern were summarized. It was considered that under the conditions of abundant uranium source conditions and stable metallogenic tectonic environment, the uranium mineralization was closely related to the type of sedimentary system, the sand body and its spatial distribution, the epigenetic alteration zoning of sand body(oxidation-reduction zoning between ancient layers),the reductive medium in sand body, hydrodynamic conditions, stratigraphic structure, heterogeneity of sand body and geochemistry environment. It was suggested that the geological factors related to uranium mineralization should be paid more attention to in the future geological exploration and scientific research of uranium deposits in the future,but in different metallogenic geological environments, we should focus on delineating the key ore controlling elements and realizing new prospecting breakthroughs.

关 键 词：砂岩型铀矿 成矿地质特征 铀矿化特征 成矿规律 鄂尔多斯盆地东北部 

分 类 号：P619.14[天文地球—矿床学]