鄂尔多斯盆地北东部纳岭沟铀矿床红色蚀变矿石成因及其地质意义

发布时间：2018-09-01 16:29

【摘要】：鄂尔多斯盆地北东部纳岭沟铀矿床是近年来发现的大型砂岩型铀矿床。与国内外典型层间氧化带型铀矿床明显不同,纳岭沟铀矿床不仅矿体呈板状、似层状产出,受单层灰绿色古氧化砂体与下伏灰色砂体的交界面控制,且远离顶底板,部分含矿岩石在宏观上表现为红色含炭屑矿石,微观上出现铀石-赤铁矿(针铁矿)-黄铁矿等特殊矿物共生组合。在综合岩矿鉴定、电子探针分析、酸解烃分析等成果认识的基础上,结合前人流体障铀成矿理论的实验和数学模拟结果认为,纳岭沟铀矿床是含氧含铀水与深部还原性流体相互作用的产物,且矿体形成过程中含氧含铀水和深部还原性流体的界面变化是红色蚀变矿石形成的关键原因,而持续强的含氧含铀水和较弱的深部还原性流体作用是形成板状矿体的主要因素。
[Abstract]:The Naling Gou uranium deposit in the north east of Ordos Basin is a large sandstone type uranium deposit discovered in recent years. Different from typical interlayer oxidation zone uranium deposits at home and abroad, Naling Gou uranium deposit is not only plate-like and bedded, but also controlled by the interface between single layer grey-green paleo oxide sand body and underlying gray sand body, and far away from top and bottom plate. Some of the ore-bearing rocks are shown as red carbonaceous ore macroscopically, and there are special mineral symbiotic assemblages such as uranium-hematite (goethite) -pyrite. On the basis of comprehensive knowledge of rock and ore identification, electron probe analysis and acidolysis hydrocarbon analysis, combined with the experimental and mathematical simulation results of previous fluid barrier uranium mineralization theory, it is concluded that, The Naling Gou uranium deposit is the product of the interaction between oxygen-bearing uranium-bearing water and deep reductive fluids, and the interface changes between oxygen-bearing uranium-bearing water and deep reductive fluids during the formation of orebodies are the key reasons for the formation of red altered ores. The continuous strong oxygen-bearing uranium-bearing water and the weak deep reductive fluid are the main factors to form the plate-like orebody.
【作者单位】：核工业北京地质研究院;
【基金】：中核集团集中研发项目《鄂尔多斯盆地北部砂岩型铀矿关键因素识别与靶区优选》(编号:地LTD1601-2) 国家重点基础研究发展计划(973计划)《典型产铀盆地成矿机理与成矿模式研究》(编号:2015CB453004)
【分类号】：P619.14

【相似文献】