正阳山钼矿床位于兴蒙造山带东段的小兴安岭—张广才岭成矿带.矿体主要呈脉状、透镜状和不规则条带状赋存于碎裂斑状二长花岗岩中.围岩蚀变大致可分出3个较强蚀变带:强硅化、石英-钾长石化带(内带),硅化、石英-绢云母化带(中带)和泥化带(外带),青磐岩化在全区普遍发育.矿体主要赋存于蚀变内带中,其次为中带,外带中只见矿化,未见矿体.地球化学特征显示Mo-Au-Zn-Cu-Pb-Ag组合为重要的找矿标志,地球物理特征显示高极化率异常、高磁异常与化探异常浓集中心互相重叠的地段为最佳找矿部位.综合研究认为,正阳山钼矿床成因类型属于斑岩型.
Zhengyangshan Molybdenum Deposit is located in the Lesser Khingan Range-Zhangguangcai Range metallogenic belt that is in the east part of Kingan-Mongolia orogenic belt. The orebodies are mainly hosted in frac-tured porphyritic monzonitic granite,occurring in the form of veins,lens and irregular bands. The wall rock alteration can be divided into three alteration zones:strong silicification,quartz-feldspatization zone ( inner zone);silicification, quartz-sericitization zone ( middle zone) and argilization ( outer zone) . Propylitization develops in the whole mining ar-ea. The orebodies are mainly hosted in the inner zone,secondly the middle zone,and the outer zone only sees some mineralization. Geochemical characteristics show that the combination of Mo,Au,Zn,Cu,Pb and Ag is important pros-pecting indicator,and geophysics indicates the overlap area of the concentration centers of high polarization anomaly, magnetic anomaly and geochemical anomaly are the best prospecting area. Comprehensive study thinks that Zhengyang-shan Molybdenum Deposit is a porphyry deposit.
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