应用电子探针研究蒙其古尔铀矿床含矿砂岩岩石学特征及铀矿物分布规律

发布时间：2018-02-02 13:35

本文关键词： 岩石学特征砂岩物源铀矿物电子探针　出处：《岩矿测试》2017年02期 　论文类型：期刊论文

【摘要】：应用精准的砂岩碎屑成分定量分析,可以为源区及沉积盆地分析等相关性质提供重要依据。本文在野外观察描述砂岩宏观特征的前提下,利用显微镜结合电子探针分析手段,对新疆蒙其古尔铀矿床中的含矿砂岩进行研究,探讨含矿砂岩岩石学特征及其中铀矿物的分布规律。结果表明:研究区含矿砂岩成分成熟度指数介于0.56~1.08,平均指数为0.78,即成分成熟度和结构成熟度低,成岩作用强烈;物源为一套混合型再旋回造山带区向过渡再旋回造山带区,最后向岩屑再旋回造山带区过渡的演变过程。碎屑物源主要来源于盆地南缘蚀源区石炭—二叠系中酸性火山岩,以及盆地周边那拉提山北缘、科古琴山、博努科努山南缘分布的一系列晚泥盆—早石炭世大哈拉军山组火山岩和少量古生代花岗岩。铀矿物类型主要为沥青铀矿、铀石及钛铀矿,其次发现有少量吸附态铀;背散射图像显示铀矿物的分布与炭屑、黄铁矿、金红石等密切共生。
[Abstract]:The application of accurate quantitative analysis of sandstone clastic components can provide an important basis for source area and sedimentary basin analysis and other related properties. This paper describes the macro characteristics of sandstone on the premise of field observation. By means of microscope and electron probe analysis, the ore-bearing sandstone in the Mongqiguer uranium deposit in Xinjiang is studied. The petrological characteristics of ore-bearing sandstone and the distribution law of uranium ore are discussed. The results show that the compositional maturity index of ore-bearing sandstone in the study area is between 0.56 and 1.08, and the average index is 0.78. The composition maturity and structure maturity are low and diagenesis is strong; The provenance is a set of mixed recirculation orogenic belt area to transition recirculation orogenic belt area. Finally, the evolution process of the transition to the lithic re-cycle orogenic belt. The source of the clastic material is mainly from the Carboniferous and Permian intermediate-acid volcanic rocks in the source area of the southern margin of the basin, as well as the northern margin of the Narati Mountains around the basin, and the Keguqin Mountains. A series of late Devonian and early Carboniferous volcanic rocks and a small amount of Paleozoic granites distributed in the southern margin of the Bonukunu Mountains. Secondly, a small amount of adsorbed uranium was found. Backscatter images show that the distribution of uranium minerals is closely associated with carbon debris, pyrite and rutile.
【作者单位】：东华理工大学放射性地质与勘探技术国防重点学科实验室;核工业216大队;青海煤炭地质105勘探队;江西省地质矿产勘查开发局赣南地质调查大队;
【基金】：国家自然科学基金重点支持项目(U1403292) “十二五”国家科技支撑计划项目(2015BAB05B04)
【分类号】：P619.14
【正文快照】： 自1880年起,砂岩型铀矿陆续进入国际视野,二十世纪五六十年代,在美国中西部地区发现了一系列大型、超大型砂岩型铀矿床,随着研究方法与技术的不断革新,形成了较为特色的区域控矿理论或成矿理论体系[1]。在岩石学方面,Dickinson等[2]先后提出了有关砂岩碎屑成分定量分析图解,Va

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