坦桑尼亚恩泽加地区覆盖区选区评价及综合找矿方法研究  

Evaluation in coverage area and study of integrated prospecting method in Nzega area of Tanzania

作　　者：司建涛[1] 白德胜[1] 祁东[1] 孙进[1] 张明礼[1] 梁永安[1] 邵江波[1] 姚明高 SI Jiantao;BAI Desheng;QI Dong;SUN Jin;ZHANG Mingli;LIANG Yongan;SHAO Jiangbo;YAO Minggao(No.2 Institute of Geological﹠Mineral Resources Survey of Henan,Zhengzhou 450001,Henan,China)

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,河南郑州450001

出　　处：《矿产与地质》2024年第1期119-125,153,共8页Mineral Resources and Geology

基　　金：河南省财政地质勘查项目(编号:豫自然资发〔2019〕22号)资助。

摘　　要：恩泽加(Nzega)绿岩带为坦桑尼亚环维多利亚湖八大绿岩带之一,为坦桑尼亚重要的产金区域之一。由于其地表覆盖程度较高,地质调查和勘查工作程度较低,虽然针对隐伏型金矿床尚具备一定的找矿潜力,但同时也面临选区评价和找矿困难的问题。研究表明:在选区评价中,针对太古界尼安萨群条带状铁建造的区域航磁异常解译和研究区地球化学金异常分析是最主要的;而在采用地物化综合找矿方法开展勘查工作中,磁法和激电法结合对于寻找覆盖区下的含铁建造内部或接触带附近或剪切带内的金矿床效果较好。该地区首次使用了取样钻施工采样,对覆盖层下发育的含金矿化蚀变带进行了地质工程揭露,取得了一定的找矿成果,先后发现了伊博罗格罗(Iborogo)、卢素(Lusu)和乔马(Choma)等多个金矿床(点)。The Nzega greenstone belt is one of the famous eight greenstone belts around Lake Victoria in Tanzania,and it is also the important gold production area.Due to its high surface coverage and low level of geological investigation and exploration work,although there is still some potential for prospecting hidden gold deposits,it also faces difficulties in selecting areas for evaluation and prospecting.The research and practice result has shown that in the evaluation of selected areas,the interpretation of regional aeromagnetic anomalies for the belt iron formation of the Archaean Nyanza Group and the analysis of geochemical gold anomalies in the study area are the most important technology methods.In the exploration work to use comprehensive geological,geophysical and geochemical exploration method,the combination of magnetic method and induced polarization method has a good effect on exploration of gold deposit within the iron bearing formation or near contact zones or shear zones under the coverage area.For the first time,drilling hole sampling method is used in the area,and geological engineering project is carried out on the gold bearing alteration zone developed under the cover layer,a certain prospecting result is achieved.Multiple gold deposits(ore points)such as Iborogo,Lusu and Choma are successively discovered.

关 键 词：绿岩带 覆盖区 地物化综合找矿 取样钻 恩泽加地区 坦桑尼亚 

分 类 号：P618.51[天文地球—矿床学] P631[天文地球—地质学]