摘要
为研究盆地南部镇原地区下白垩统环河组铀矿化特征及找矿方向,综合分析现有钻孔资料以及收集的相关地质信息,以水成铀成矿理论为指导,对环河组铀成矿地质特征和控矿因素进行研究,系统总结断裂构造位置、岩性岩相、地球化学分带等定位条件。研究结果表明,下白垩统环河组下段主要发育冲积扇-辫状河-辫状河三角洲沉积体系,河流作用明显,三角洲水下分流河道与砂坝是有利的成矿部位,铀矿化主要发育在该段。另外,环河组上段泥-砂-泥结构发育,层间氧化带具有多层性、多期叠加的特点,主砂体埋深浅且已经发现薄层铀矿化,也是下一步找矿方向;镇原地区铀矿化分布与岩性岩相、岩性地球化学以及断裂构造等联合控制,黄色氧化带是重要找矿标志。
In order to study the characteristics and prospecting direction of uranium mineralization in the Lower Cretaceous Huanhe Formation in Zhenyuan area of southern Ordos basin,comprehensiv analysis of the existing drilling data and the relevant geological information were collected to study the geological characteristics and ore control factors of uranium mineralization in the Huanhe Formation according to the theory of hydrogenic uranium mineralization,The positioning conditions such as fault tectonic location,lithological lithofacies and geochemical zoning were systematically summarized.The results showed that the lower member of the Lower Cretaceous Huanhe Formation was mainly the products of alluvial fan-braided river-braided river delta sedimentary system,the delta underwater diversion channel and sand dam are favorable sedimentray faces for mineralization,uranium mineralization was mainly developed in this faces.In addition,the mud-sand-mud structure of the upper member of the Huanhe Formation was developed.The interlayer oxidation zone is of multi-layered and multi-stage superposition character,the main sand body is buried at a shallow depth and thin-layer uranium mineralization has been found,which is also the next prospecting direction.The distribution of uranium mineralization in the Zhenyuan area is jointly controlled by lithological facies,lithologic geochemistry and fault structure,and the yellow oxide zone is an important prospecting marker.
作者
权建平
武正乾
毛宁
刘坤鹏
QUAN Jianping;WU Zhengqian;MAO Ning;LIU Kunpeng(Research Institute No.203,CNNC,Xi'an,Shaanxi 710086,China)
出处
《铀矿地质》
CAS
CSCD
2023年第6期950-959,共10页
Uranium Geology
基金
中国核工业地勘基金项目“鄂尔多斯盆地南部旬邑-盐池地区铀矿资源评价与勘查”(编号:2022-17)
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)”联合资助。
关键词
铀成矿地质特征
控矿因素
砂岩型铀矿
镇原地区
鄂尔多斯盆地南部
geological characteristics of uranium mineralization
mineralization control factors
sandstone uranium deposit
Zhenyuan area
southern Ordos basin
