刚果(金)加丹加(Katanga)省利卡西(Likasi)市西南部同生沉积型铜钴矿快速定位和评价方法

Rapid position and evaluation method of syngenetic sedimentary copper-cobalt deposit in the southwest of Likasi City,Katanga Province,Congo(DRC)

中非铜钴成矿带,横贯刚果(金)与赞比亚两国的交界地带,是目前为止世界上的第三大铜钴资源富集区。研究区地处加丹加—谦比西构造带中外部褶皱推覆带南缘,同生沉积型铜钴成矿条件优越,但地质工作程度低,找矿勘查潜力大。在系统总结区域同生沉积型铜钴矿的成矿规律及地质特征的基础上,从地质、地球物理、地球化学、遥感及样品快速分析等技术入手,介绍快速定位和评价区内铜钴矿的有效方法。区内迪佩特亚群R.G.S组含铁白云质粉砂岩层可作为航磁测量及ETM铁染异常信息提取的标志层,有助于快速定位识别矿山亚群(R_(2))含矿地层,厘定矿区构造格架;利用迪佩特亚群R.G.S组(R_(3.1))、矿山亚群Kambove组(R_(2.3))标志层特性,结合区域地层层序及地层厚度数据,可定量分析同生沉积型铜钴矿化层的空间位置,从而实现对矿(层)体的快速评价。文章论述的区域同生沉积型铜钴矿快速定位、评价法经实践验证可靠有效,可在中非铜钴成矿带中推广应用。

Central African copper-cobalt metallogenic belt,which crosses the border between Congo(DRC)and Zambia,is the third largest copper cobalt resource enrichment area in the world.The study area is located in the south margin of the outer fold-nappe belt of the Katanga Chambishi structural belt.The syngenetic sedimentary copper-cobalt mineralization condition is superior,but the geological work degree is low and the prospecting and exploration potential is large.Based on the systematic summary of the metallogenic regularity and geological characteristics of syngenetic sedimentary copper-cobalt deposits in the region,the paper introduces an effective method for rapid position and evaluation of copper-cobalt deposit in this area with the help of geological,geophysical,geochemical,remote sensing and rapid sample analysis technology.The iron bearing dolomitic siltstone layer of R.G.S Formation of Dipet Subgroup(R_(3.1))can be used as a mark layer for aeromagnetic survey and ETM iron staining anomaly information extraction,which is helpful to quickly locate and identify the ore bearing strata of the Mine Subgroup(R_(2))and analyze the structure of the mining area.The spatial position of syngenetic sedimentary copper-cobalt mineralization layer can be quantitatively analyzed by using the characteristic marker layers of R.G.S Formation(R_(3.1))of Dipet Subgroup and Kambove Formation(R_(2.3))of Mine Subgroup,with the combination of the regional stratigraphic sequence and thickness data,it can be realized for the rapid evaluation of the ore(layer)body.The rapid location and evaluation method of regional syngenetic sedimentary copper-cobalt deposits discussed in this paper is proved to be reliable and effective through practice,and it can be applied in the copper-cobalt metallogenic belt in Central Africa.