坦桑尼亚太古界卡维隆多群杂砾岩型金矿化特征及其发现意义  

Gold mineralization characteristics and discovery significanceof the Archaean Kavirondian Group conglomerate in Tanzania

作　　者：司建涛[1] 杜晓冉[2] 白德胜[1] 张明礼[1] 董岘证 孙进[1] 柴丽洁 Si Jiantao;Du Xiaoran;Bai Desheng;Zhang Mingli;Dong Xianzheng;Sun Jin;Chai Lijie(No.2 Institute of Geological&Mineral Resources Survey of Henan;Henan Provincial Testing Center for Rocks and Minerals)

机构地区：[1]河南省地质矿产勘查开发局第二地质矿产调查院 [2]河南省岩石矿物测试中心

出　　处：《黄金》2023年第9期117-122,共6页Gold

基　　金：河南省财政地质勘查项目(豫自然资发[2019]22号)。

摘　　要：坦桑尼亚太古界卡维隆多群杂砾岩主要分布于中部的恩泽加地区,少量分布于其西南部的卢帕地区,该岩系在恩泽加地区呈近东西向和北西向展布,长约50 km,宽0.5~3 km,并普遍发育金矿化,其矿化特征主要为硅化和黄铁矿化,其次为毒砂化和磁黄铁矿化。研究成果表明:①激电异常显示出明显相对低阻高极化特征;②土壤地球化学测量结果显示,Au异常规模较大,浓集中心及分带较为明显;③金矿化严格受岩层控制,局限于杂砾岩带内;④金矿化规模大,矿化体宽5~20 m;⑤矿化体金品位较低,为0.2~1.0 g/t,局部富集地段可达到2~3 g/t。The Tanzania Archaean Kavirondian Group conglomerates are primarily distributed in the Nzega region of central Tanzania,with a small amount also found in the Lupa region to the southwest.This rock formation,which extends approximately 50 km in length and 0.5-3 km in width in a near EW and NW direction,is characterized by widespread gold mineralization.The main mineralization features include silicification and pyrite mineralization,followed by arsenopyrite mineralization and pyrrhotite mineralization.The study findings are as follows:①Induced polarization anomalies exhibit distinct relatively low resistivity and high polarization characteristics.②Soil geochemical measurements show significant Au anomalies with well-defined concentration centers and zones.③Gold mineralization is strictly controlled by rock layers and is confined to the conglomerate zones.④The gold mineralization is extensive,with mineralized bodies ranging from 5 m to 20 m in width.⑤The gold grades within the mineralized bodies are relatively low,ranging from 0.2 g/t to 1.0 g/t,but local enrichment zones can reach 2 g/t to 3 g/t.

关 键 词：坦桑尼亚 恩泽加 卡维隆多群 杂砾岩 金矿化 太古界 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]