广西向阳坪铀矿床成矿地质特征

广西向阳坪铀矿床为南方花岗型铀矿,新一轮的扩大勘查取得了较好的成果。笔者通过系统分析该矿床的铀成矿地质特征,认为区内铀源丰富,香草坪和豆乍山花岗岩是两个重要的产铀岩体;区内NE-NNE向断裂构造规模大,与之平行的次级成矿构造及隐伏断裂密集发育,铀矿体严格受F_(10)断裂构造带控制;矿体多呈脉状和透镜状产出,主矿体沿走向延伸稳定;常见的共生矿物组合为铀-赤铁矿-黄铁矿类型;热液蚀变作用强烈,成矿期以赤铁矿化(红化)、黄铁矿化、硅化、碳酸盐化为主,与铀矿化关系密切。下一步的勘查工作可继续沿F_(10)断裂构造带北段D72-D0号勘探线开展,继续扩大矿床规模;对南段D0-D59号勘探线可进行普查或详查,有望扩大矿区的资源量。此外,可适当对F_(10)号带深部进行探索,寻求更富、更大的铀矿体。

Geological Features of Xiangyangping Uranium Deposit in Guangxi

Xiangyangping uranium deposit is a vital area of granite type uranium prospecting in the south of China.This article systematicly analyzed and summarized the metallogenic characteristics of the depos-it.The results shew that Xiangyangping area are rich in uranium source and Xiangcaoping and Douzhashan pluton are the important uranium metallogenic plutons.NE NNE fractures are large and with densely developed parall and concealed structures.Uranium ore body is strictly controlled by struc-ture and exists in the shape of net and lens.The main ore bodies occurred along the fracture strike and ex-tends stably.The common type of mineral paragentic association is uranium hermetite pyrite;the de-posit is with strong hydrothermal alteration of hematitization,pyritization,silication and carbonatiza-tion.Through the comprehensive analysis,the next exploration should be continuously along prospecting line D72 to D0 in the northern part of fracture F1 0 so as to expand the scale of ore bodies and detailed ex-ploration should be carried out along prospecting line D0 to D59 in the southern part of fracture F1 0.At the same time,Exploration can also preformed in the deep of fracture F1 0 to seek the richer and larger ore bodies.