青海省北祁连中段托勒山地区金锑等多金属矿地球化学特征及其找矿前景

青海省北祁连中段托勒山地区金锑多金属矿属北祁连中段托勒山成矿带。岩石地球化学分析表明,岩石中金含量最高的为石英脉,其次是石英碳酸盐岩、二云石英片岩、玄武岩、橄榄岩、硅质白云岩和糜棱岩等,且与破碎蚀变带关系密切,地层岩性和次级断裂构造对于Au及各元素的富集(或成矿)起着重要作用;土壤地球化学测量共圈出土壤异常6个,各异常中Au,Cu,As,Sb元素异常套合性较好,各元素曲线在具有矿化蚀变的硅质白云岩中峰值相对其他岩性较大,且Au,As,Sb元素具有较强的相关性。从地质角度来看,区域上金多金属矿化主要与地层、断裂构造和侵入岩有关,而起决定作用的是火山活动及火山岩。测区充分具备这些条件的地区目前地表揭露能有良好的成矿显示,这些成矿有利区域,尤其是深部岩体接触边界附近是成矿的重点和金、铜、锑多金属矿前景突破的关键。

Geochemical characteristics of Au-Sb poly-metallic ore deposits in Tuoleshan area at middle of the North Qilianshan Mountains and the ore potential

At middle of the North Qilianshan Mountains there is the Tuoleshan ore belt in which Au-Sb poly-metallic ore deposits occur. Petrochemistry shows that gold is highest in quartz vein, then quartz-carbonate rock, biotite-muscovite quartz schist, basalt, peridotite, siliceous dolomite and myllonite etc. Concentration of gold is closely related to altered cataclastic rock zone. Lithology and sub-fractures play important role in enrichment of Au and ore elements. Soil geochemical survey shows 6 anomlies and Au,Cu,As,Sb element anomlies are well coincided. Peak value of each elements of altered, mineralized siliceous dolomite is higher than other lithologies and Au,As,Sb highly correlated. Geologically, the regional poly-metallic mineralization is related to strata and fractures and volcanism and volcanic rocks play important role in mineralization. In the survey area some localities possess such conditions with well revealed ore indication. In the favorable mineralization localities, especially contact zone of deep intrusive bodies are the key of metallogeny and prospecting breakthrough.