湖南省绥宁县桃坪矿区花岗岩型铀矿化特征与找矿潜力分析  

Mineralization characteristics of granite type uranium deposit and evaluation of metalogenic potential in Taoping mining area,Suining County,Hunan

作　　者：谢玉华 XIE Yuhua(Geological Team No.301,Hunan Nuclear Geology,Changsha 410114,Hunan,China)

机构地区：[1]湖南省核工业地质局三○一大队,湖南长沙410114

出　　处：《矿产与地质》2021年第3期410-415,共6页Mineral Resources and Geology

基　　金：中核基金项目“湖南省绥宁县桃坪地区铀矿普查”(勘合〔2011〕006号)资助。

摘　　要：湖南省绥宁县桃坪矿区位于雪峰弧形构造成矿带东南缘,系扬子陆块内的花岗岩型铀矿。通过前人资料分析、野外地质调查和综合研究,认为瓦屋塘岩体为富铀花岗岩,为区内铀成矿提供丰富铀源。铀矿化(体)与断裂关系密切,主要铀矿体呈扁平状、透镜状及不规则脉状等赋存在断裂分支复合部位及上下盘的次级断裂中,含矿围岩为主体过渡相中—中细粒斑状黑云母二长花岗岩。热液成矿活动分为6个阶段,其中红色微晶石英阶段、黑紫色萤石阶段、沥青铀矿-胶黄铁矿阶段为铀成矿主要阶段,铀矿化类型为铀-微晶石英型和铀-萤石型矿化。类比九嶷山岩体铀成矿空间赋存规律,认为盐井和茅坪两个异常区,应作为进一步优选找矿靶区,可望率先取得找矿突破。Taoping deposit is located in the southeastern margin of Xuefeng arc tectonic metallogenic belt and it is a granite-type uranium deposit in the Yangtze continental block.According to the previous data analysis,field geological survey and comprehensive research,it is considered that Wawutang rock mass is uranium-rich granite,which provides abundant ore-forming materials for uranium mineralization in the area.Uranium mineralization body is closely related to the fault,main uranium ore bodies are flat,lentiform and irregular veins,which are hosted in the compound parts of fault branches and the secondary faults in the upper and lower walls.The ore-bearing surrounding rocks are mainly medium-medium fine porphyritic biotite monzogranite of the transition phase.The hydrothermal mineralization activity can be divided into six stages,of which the red microcrystalline quartz stage,black purple fluorite stage and pitchblende-collopyrite stage are the main stages of uranium mineralization.The uranium mineralization is mainly uranium-microcrystalline quartz type and uranium-fluorite type.According to the spatial occurrence regularity of uranium mineralization in Jiuyishan rock body,it is considered that the two anomaly areas of Yanjing and Maoping should be taken as the priority prospecting target areas,which are firstly expected to achieve the prospecting breakthrough.

关 键 词：桃坪矿区 铀矿化特征 找矿靶区 湖南绥宁 

分 类 号：P619.14[天文地球—矿床学]