铀矿地质2024，Vol.40Issue(1)：71-80,10.DOI:10.3969/j.issn.1000-0658.2024.40.006
鄂尔多斯盆地南部宁县新华地区直罗组沉积特征及铀成矿条件分析
Sedimentary Characteristics and Uranium Metallogenic Conditions of Zhiluo Formation in Xinhua Area,Ning County,Southern Ordos Basin
摘要
Abstract
Xinhua area is one of the key areas for prospecting in the Middle Jurassic Zhiluo Formation in the southern Ordos Basin,the sedimentary characteristics and uranium metallogenic conditions play important role in guiding the exploration of sandstone type uranium deposits in this area.Based on core observation and comprehensive analysis of the drilling data,a series of maps such as thickness of Zhiluo Formation,sand body thickness and percentage,oxidation rate and uranium mineralization prospect prediction map,the sedimentary facies and uranium metallogenic conditions of Zhiluo Formation were analyzed comprehensively as well.The result showed that:the upper member of Zhiluo Formation in Xinhua area are mainly the sediments of meander river faces,which can be divided into meander river channel,side beach,natural bank and flood plain microfacies deposits,while the lower member of Zhiluo Formation are mainly the products of braided river deposition,which can be divided into braided river channel,channel bar and flood plain microfacies deposits.Among the developed faces,the braided river channel sand body of the lower member of Zhiluo Formation has moderate thickness,good connectivity and rich in reducing substances,which is favorable for uranoium mineralization.In Xinhua area,there are structural skylights and interlayer oxidation zones.The braided river channel in the lower part of Zhiluo Formation is distributed from south to north,and the oxidation zone and sand body distribution are basically the same,which is favorable to uranium mineralization.Based on the structural conditions,sedimentary characteristics,epigenesis alteration characteristics and uranium mineralization information,natural gamma anomalies,it was believed that the Zhaocun-Baidian-Cuijialing area is the most favorable area for uranium mineralization,and should be the key target area for the next exploration of sandstone type uranium deposits in Zhiluo Formation.关键词
沉积相/直罗组/鄂尔多斯盆地南部/砂岩型铀矿/成矿条件Key words
sedimentary facies/Zhiluo Formation/southern Ordos Basin/sandstone type uranium deposit/metallogenic condition分类
天文与地球科学引用本文复制引用
刘凯鹏,王晓鹏,武正乾,冯博,毛宁..鄂尔多斯盆地南部宁县新华地区直罗组沉积特征及铀成矿条件分析[J].铀矿地质,2024,40(1):71-80,10.基金项目
中国核工业地质局项目"鄂尔多斯盆地南部旬邑-盐池地区铀矿资源调查评价与勘查"(编号:2022-17)和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)联合资助. （编号:2022-17）
