福建紫金山铜金矿床地质地球化学找矿模型及应用

本文根据紫金山铜金矿区地表岩石测量和矿床钻孔剖面原生晕研究结果,详尽讨论了成晕元素在水平和垂向上的异常分布特征,确定了矿床的主要成矿元素及伴生元素,计算了矿床元素分带序列,阐明了矿床异常元素的分带规律.以矿上、矿下晕和元素分带关系为基础,运用元素对累乘比值对矿床Cu、Au矿带的剥蚀水平制定了评价准则.结合矿区和矿床地质特征,建立了紫金山矿区(田)的地质地球化学找矿模型.在矿区外围的勘查地球化学找矿研究中,还发现了具工业意义的矿体及新的矿化类型(斑岩Au、Cu和Mo矿),从而为紫金山地区发展成为大型铜矿田奠定了基础.

THE GEOLOGICAL-GEOCHEMICAL PROSPECTING MODEL OF THE ZIJINSHAN COPPER-GOLD DEPOSIT AND ITS APPLICATION

On the basis of achievements obtained in surface rock survey and borehole primary halo studies performed in the Zijinshan copper-gold ore district, the present paper has discussed in detail horizontal and vertical anomaly distribution characteristics of halo-forming elements in the ore deposit, determined main ore-forming elements and associated elements, calculated zonal sequence of elements, expounded zonation of anomalous elements and, based on super-orehalos, be low-ore halos and element zonation and using multiplictive ratios, formulated Criteria for evaluating denudation level of copper and gold ore zones. These data. combined with geological characteristics of the ore district and ore deposit. have led the authors to establish the geological-geochemical prospecting mo del of the Zijinsban ore district. In geocbemical exploration conducted on the outskirts of the roe district. economically valuable orebodies and new mineralization types (porphyry gold, copper and molybdenum ores) were discovered, thus laying a foundation for the development of the Zilinshan district into a large-sized copper deposit.