四川省攀枝花大田地区铀矿化分布特征、控制因素及找矿方向

Distribution Characteristics,Controlling Factors and Prospecting Direction of Uranium Mineralization in Panzhihua Datian Area,Sichuan Province

康滇地轴铀矿化在形成时代、矿化特征、矿化成因上均与我国其他地区区别明显,其中四川省攀枝花大田地区是康滇地轴铀矿地质研究程度最高的地区。近年来通过开展物探测量、钻探工程揭露及室内综合研究等工作,在矿区内共发现了Ⅰ号、Ⅱ号及Ⅲ号铀矿化带,铀矿体主要产于Ⅰ号铀矿化带中,铀矿体主要呈透镜状分布。本文根据含矿围岩类型并结合矿化特征,初步将研究区铀矿化划分为蚀变斜长岩型、糜棱岩型及接触变质岩型矽3种类型,并分析了不同类型铀矿化的主要控制因素,初步探讨了不同类型铀矿化成因。综合研究认为,大田地区地表找矿方向应集中于Ⅰ号、Ⅱ号铀矿化西部及黄泥田岩体边缘,深部找矿方向应聚焦于花岗质岩体与变质围岩接触界面。

The uranium mineralization age,mineralization characteristics and mineralization genesis in Kangdian axis are unique in China.So far,Datian uranium deposit,localed in Panzhihua,Sichuan Province,is the area with the highest research degree.In recent years,Ⅰ,ⅡandⅢuranium mineralization belts have been found through geophysical survey,drilling engineering and comprehensive study indoor.Uranium orebodies are mainly found in theⅠuranium mineralization belt,which distributed discontinuously in the shape of lens.Three uranium mineralization types are divided according to the ore-bearing wall rock and mineralization characteristics,including altered plagioclase type,mylonite type and contact metamorphism type.The main controlling factors of different types of uranium mineralization are analyzed,and the genesis of different types of uranium mineralization is discussed.According to comprehensive research,it is considered that the surface prospecting direction should be concentrated in the west ofⅠ,Ⅱuranium mineralization belt and the edge of Huangnitian rock mass.The deep prospecting direction should focus on the contact interface between granitic rock mass and metamorphic surrounding rock.