四川省红泥坡铜矿原生晕特征及找矿方向

Primary halo characteristics and prospecting direction of Hongnipo copper deposit,Sichuan Province

【研究目的】四川省红泥坡铜矿是近年来在扬子准地台西缘康滇地轴中段发现的一处大型铜矿,由于矿体埋藏较深,地表被第四系覆盖,其深部和外围找矿难以突破。【研究方法】本文通过对矿区P-3勘查线上的5个钻孔进行原生晕样品采集,并对349个样品中的18个元素进行了分析测试和原生晕特征研究。【研究结果】主成矿元素Cu主要分布在天生坝组下段和落凼组上段,多元统计分析显示Cu与Ag、Co、Mo、As、Sb等元素的相关性较好,利用格里戈良分带指数法获得矿体原生晕轴向分带序列为(由上到下):F、Nb、La→Au、Ag、Bi、Mo→Cu、Zn、Pb、As→Sn→Co、Sb。【结论】通过构建地球化学参数找矿指标,建立了红泥坡铜矿的找矿预测模型,初步认为红泥坡铜矿的1号矿体向西部还有一定的延伸。

[Objective]The Hongnipo copper deposit in Sichuan Province is a large new-discovered copper deposit in recent years in the middle section of the Kangdian axis on the western edge of the Yangtze platform.Due to the deep burial of the ore body,the surface is covered by the Quaternary,and it is difficult to break through in deep and peripheral ore exploration.[Methods]This article collected primary halo samples from 5 boreholes on the P-3 exploration line in the mining area,and analyzed and tested 18 elements out of 349 samples,as well as studied the characteristics of primary halos.[Results]The main ore-forming element Cu is mainly distributed in the lower section of Tianshengba Formation and the upper section of Luodang Formation.Multivariate statistical analysis shows that Cu has a good correlation with Ag,Co,Mo,As,Sb and other elements.The axial zoning sequence of the primary halo of the ore body is obtained by using the Grigoryan zoning index method:F,Nb,La→Au,Ag,Bi,Mo→Cu,Zn,Pb,As→Sn→Co,Sb.[Conclusions]Through the construction of geochemical exploration indexes,the prospecting prediction model of Hongnipo copper deposit is established,and it is preliminarily believed that the No.1 ore body of Hongnipo copper mine still extends to the west.