陕西洛南寺耳金矿成矿规律与成矿预测

Ore-forming Regularities and Mineralization Forecast of the Si’er Gold Deposit in Luonan,Shanxi Province

陕西寺耳金矿成矿地质背景在小秦岭地区具有代表性,为了揭示其成矿规律和深部成矿潜力,为本区及小秦岭其它地区找矿提供借鉴,文章在分析寺耳金矿成矿地质背景和矿床地质特征的基础上,研究其成矿特点,发现矿区内矿化带、矿脉(体)多呈等距性分布,硅化、黄铁矿化、钾化与金矿化关系密切,烟灰色石英、钾长石和黄铁矿组合对金矿化具有明显的指示性,小秦岭地区金矿化类型从浅部至深部由石英脉型转变为蚀变岩型的垂向变化规律具有普遍性;结合成矿规律,通过分析矿区内Q501、Q502、Q529三条主矿脉的原生晕指示元素含量轴向变化规律进行成矿预测,指出Q501、Q502矿脉深部具有较大的成矿潜力,Q529矿脉深部成矿潜力有待今后探矿工程验证。

The purpose of this work is to reveal the ore-forming rules and mineralization potential at depth in the Si＇ er gold deposit, of which the metallogenic geology background is typical in the Xiaoqinling area, and provide reference for further ore exploration of this region and other places. We have studied its ore-forming characteristics based on analyzing its metallogenic geology background and geology features. It is found that mineralization belts as well as veins occur at a certain distance with others in the district. The alterations of pyrite, silicon and potassium have close relationship with gold mineralization. The association of quartz with smoky gray color, potassium feldspar and pyrite shows an apparently indicative mark to gold mineralization. Besides, a widespread regularity in the Xiaoqinling area is found that the quartz-vein type of gold mineralization in the shallow subsurface changes into aheration-rock type in the deep subsurface. Combining with ore-forming regularities and analyzing the axial changing regularities of prinary-halo indicator content of three main veins （ Q501 ,Q502 and Q529）, the great mineralization potential of Q501 and Q502 has been forecasted, and that of Q529 remains to be tested by further exploration work.