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江苏省南京市西横山金矿床地质特征及找矿潜力

Geological characteristics and prospecting potentials of Xihengshan Gold Deposit,Nanjing City,Jiangsu Province

  • 摘要: 西横山金矿床位于长江中下游铁、铜、金、多金属成矿带。矿体主要呈脉状、透镜状赋存于构造破碎带中。矿石类型以氧化矿石为主,成矿元素以金为主,局部共、伴生铜、银。矿石呈粒状结构、包含结构、交代结构等,细脉状构造、浸染状构造、团块状构造等。褐铁矿化、硅化、碳酸盐化、泥化等蚀变较强。矿体成因类型以构造破碎带型为主,局部发育接触交代型。北西向、近东西向断裂构造破碎带和北东向层间构造破碎带为重要的导矿和容矿构造,Au异常与地表矿化吻合是直接找矿标志。采用含矿率法对控制程度较低的构造破碎带进行了资源潜力评价,结果表明矿区有望勘获大型金矿床。综合研究认为,该矿区成矿地质条件优越、物化探异常良好,找矿线索明显,资源潜力巨大。

     

    Abstract: Xihengshan Gold Deposit is located on the iron,copper,and gold polymetallic belt in the middle and lower reaches of Changjiang River.The ore body mainly occurs in the structural fractured zone in form of veins and lenses.The ores are mainly oxide ores,the main ore-forming element is gold while copper and silver locally coexist andare associated.The ores are in particle structure,inclusion structure,metasomatic structure,veinlet structure,dissemination structure,block structure,and so on.The alterations such as limonitization,silicification,carbonatization,and argillization are intense.The ore body genesis is mainly structural fractured zone and locally contact metasomatism.NW and near EW fault structural fractured zones and NE interlayer structural fractured zones are important ore-conducting and ore-hosting structures.The Au anomaly is consistent with surface mineralization,which is a direct prospecting indicator.The study uses the ore-bearing rate method to assess the resource potentials of the structural fractured zone with lower control degrees and it shows that the district has the potential for large-scale gold deposits.A comprehensive study takes that the district has favorable geological conditions and good physical and chemical prospecting anomalies,which is an evident prospecting clue and shows great resource potential.

     

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