广西摩天岭北部高堤地区铀矿化特征

Uranium Mineralization Characteristic of Gaodi Area in North Motianling of Guangxi Province

为探讨广西摩天岭北部铀成矿作用,文章以高堤地区为例,从铀矿石特征、铀矿物特征、岩石地球化学特征等多方面,研究了高堤地区的铀矿化特征。结果显示,高堤地区的铀矿化产于NNE向断裂带内,并发育多期次铀矿化。早期的铀矿化形成于雪峰期,其矿石发育硅化、弱钾长石化蚀变,沥青铀矿与微晶石英脉共生,沥青铀矿中UO2、SiO2、PbO含量变化较大,其成矿物质与摩天岭花岗岩关系密切。晚期的铀矿化形成于喜山期,其矿石发育硅化、赤铁化、钾长石化蚀变,沥青铀矿与石英、黄铁矿、赤铁矿共生,沥青铀矿中UO2、SiO2、PbO含量变化较稳定,其成矿物质部分来自摩天岭花岗岩和其他热液成分的参与。

In order to research the uranium mineralization of north Motianling area,the characteristics of uranium mineralization in Gaodi area was studied in uranium ore,uranium minerals and geochemistry of host rocks.The results indicated that most of the uranium ore was in the NNE fault,and there are several stages of uranium mineralization in this area.The early stage of uranium mineralization occurred at Proterozoic,the uranium ore was associated with silicification,weak potassium feldspathization.The pitchblende was found surrounded by microcrystalline quartz,the content of UO2,SiO2 and PbO in pitchblende is unstable,and the early stage mineralization uranium source was believed closely related to Motianling granite.The later stage of uranium mineralization occurred at Himalayan period,the alteration of the uranium ore was silicification,hematitiztion and potassium feldspathization.The pitchblende was found surrounded by pyrite,hematite and quartz.The content of UO2,SiO2 and PbO in pitchblende is stable,and mineralization uranium source was from Motianling granite pluton and other hydrothermal fluids.