六盘山盆地月亮山地区铀成矿地质特征分析
Analysis to the Geological Features Relating to Uranium Metallogenesis in Mount Moon Area, Liupanshan Basin

该文以六盘山盆地中西部月亮斜坡带为研究区，通过野外铀矿专项地质调查，借助采集的岩矿样品所开展主微量测试、镜下鉴定和扫描电镜结果，分析了月亮山地区铀矿化特征和铀成矿地质条件。认为该地区赋矿层主要为下白统，地表出露的铀矿化主要为沉积–成岩型，但该地区发育有稳定的构造斜坡带，铀源条件较优越，区域“补–径–排”体系完善，下白垩统和商铺组和李洼峡组发育有一定规模的砂体，综合认为该地区具备层间氧化带型铀矿发育的基本条件。在前人基础地质和铀矿地质研究的基础上，进一步分析了六盘山盆地的铀矿化类型、主攻找矿目标层和有利的找矿区域，旨在为六盘山盆地铀矿地质勘查提供找矿思路和找矿方向。
A field geological survey was conducted for investigating uranium in Mount Moon slope in the Central Western Liupanshan Basin. Representative samples of rocks and uranium mineralization were studied using chemical assay for major and micro elements, thin section identification and SEM analysis. Based on the results of field investigation and laboratory analysis, the uranium mineralization characteristics and the geological conditions for uranium metallogenesis in Mount Moon area were summarized. In Mount Moon area, the uranium-hosting rocks are mainly in Lower Cretaceous formations, and the outcropped uranium mineralization is mainly syn-sedimentation type. Comprehensively, it is thought that there were basic conditions to have formed interlayered oxidation zone type uranium deposit in this area, i.e., there was a stable structure slope zone, uranium sources were excellent, a regional system of charging-flowing-discharging was integrated, and there were sufficient sand bodies in the Heshangpu and Liwaxia formations, Lower Cretaceous. Furthermore, on the foundation of the previous studies of basic geology and uranium geology, the uranium mineralization types, main target layers of uranium and favorable prospective areas were analyzed for the Liupanshan Basin, aiming to propose a thinking and direction for uranium geological exploration in this basin.