陕西镇坪地区唐家垭子钼钒多金属矿床地质特征与成因

Geological Characteristics and Genesis of Tangjiayazi Mo-V Polymetallic Deposit in Zhenping Area of Shaanxi

陕西镇坪地区唐家垭子钼钒多金属矿床是近年来新发现的钼钒矿床,含矿地层及矿化带延伸情况显示其具有达到大型规模的潜力。矿体产于寒武系下统鲁家坪组黑色岩系,与地层展布方向一致,受黑色岩系控制；矿石类型有含炭板岩型、粉砂质板岩型及含炭硅质岩型3种；矿石含钼矿物主要有铁钼华、钼华、胶硫钼矿等,钒主要存在于钒云母中,其次为高岭土、电气石等；矿石化学成分以Mo、V2 O5为主,主成矿元素为Mo、V,伴生金属元素有Ag等。矿床地球化学综合分析认为,寒武系下统鲁家坪组为（较封闭的）浅海盆地相；含矿地层鲁家坪组的 Mo、Cu、Ni、Pb 含量分析表明,沉积的深度可能大于250 m；w（Ni）/w（Ti）、w（Cu）/w（Ti）值表明,沉积的离岸距离为100~300 km；w（V）/w（Ni）、w（V）/（w（V）＋w（Ni））值反映成矿期处于缺氧—强缺氧的还原沉积环境；矿床地质地球化学分析表明,该矿床为明显的深海冷水沉积型矿床。

Tangjiayazi Mo-V polymetallic deposit in Zhenping area of Shaanxi is a newfound Mo-V deposit in recent years,and potentially reaches a large scale according to the extension of orebearing strata and mineralized belt.Orebody occurs in the black rock series of Lower Cambrain Lujiaping Formation,and the extension is consistent with stratum,and is controlled by the black rock series;ore types include carbonaceous slate rock,silty slate rock and carbonaceous siliceous rock;Mo-bearing minerals include ferrimolybdite,molybdine,jordisite,etc.,and V-bearing minerals include roscoelite primarily,and secondarily kaolin and tourmaline,etc.;the chemical components of ore are mainly Mo and V2 O5 ,the main ore-forming elements are mainly Mo and V,and the associated metal elements are Ag,etc.Comprehensive analysis for geochemistry of mineral deposit indicates Lower Cambrain Lujiaping Formation is closed shallow-sea basin facies; the contents of Mo,Cu,Ni and Pb elements in Lujiaping Formation of ore-bearing strata show that sediment depth may be greater than 250 m;the values of w （Ni）/w （Ti）and w （Cu）/w （Ti） show that sediment offshore distance is 100-300 km;the values of w （V）/w （Ni）and w （V）/（w （V）＋w （Ni）） show that the sedimentary environment is reduction-strong reduction in metallogenic period;the geological and geochemical analysis of deposit indicates that Tangjiayazi Mo-V polymetallic deposit is significantly deep-sea cold-water sedimentary.