鄂尔多斯盆地南缘彬县地区水文地球化学及铀成矿作用特征

发布时间：2018-05-28 09:36

本文选题：水文地质 + 砂岩型铀矿　；参考：《地质通报》2017年04期

【摘要】：水文地质作用是砂岩型铀矿成矿过程中不可缺少的重要作用之一。通过陕西彬县地区水文地质条件和水文地球化学环境分析,将中新生代地层地下水划分为松散岩类孔隙水、碎屑岩类孔隙裂隙水和碎屑岩类裂隙水3种类型。根据地下水的补给、径流、排泄条件,划分出水交替强烈带、水交替缓慢带和水交替滞缓带3个不同的水动力分带。不同类型地下水的含铀性、不同分带铀的运移和富集特征,以及酸、碱性地下水对围岩蚀变与铀成矿的作用表明,中侏罗统直罗组砂岩含矿含水层中铀成矿主要经历了沉积成岩时期铀的预富集作用、古地下水的后生改造叠加成矿作用和深部油田水的还原成矿作用,铀成矿作用为复合成因类型。
[Abstract]:Hydrogeology is one of the important and indispensable roles in the metallogenic process of sandstone-type uranium deposits. Based on the analysis of hydrogeological conditions and hydrogeochemical environment in Binxian area of Shaanxi Province, the groundwater of Meso-Cenozoic strata is divided into three types: loose rock pore water, clastic rock pore fissure water and clastic rock fissure water. According to groundwater recharge, runoff and discharge conditions, there are three different hydrodynamic zones: strong water alternating zone, water alternating slow zone and water alternating slow zone. The uranium-bearing characteristics of different types of groundwater, the migration and enrichment characteristics of uranium in different zonation zones, and the effects of acid and alkaline groundwater on the alteration of surrounding rock and uranium mineralization indicate that, Uranium mineralization in the sandstone ore-bearing aquifer of the Middle Jurassic Zhiluo formation has mainly experienced the preenrichment of uranium during sedimentary diagenesis, the superposition mineralization of paleo-groundwater and the reduction and mineralization of deep oilfield water. Uranium mineralization is a complex genetic type.
【作者单位】：中核集团铀资源勘查与评价技术重点实验室/核工业北京地质研究院;
【基金】：中国核工业地质局项目《鄂尔多斯盆地南缘铀成矿地质特征与远景评价》(编号:201586) 中核集团集中研发项目《鄂尔多斯盆地南部砂岩型铀矿关键因素识别与靶区优选》(编号:地LTD1601-3) 国家973项目《北方典型产铀盆地成矿机理与成矿模式》(编号:2015CB453004)
【分类号】：P619.14;P641

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