坦桑尼亚恩泽加绿岩带隐伏金矿床综合找矿模型  

Comprehensive Prospecting Model of Concealed Gold Deposits in the Nzega Greenstone Belt,Tanzania

作　　者：司建涛[1] 张明礼[1] 白德胜[1] 邵江波[1] 郭鑫 孙进[1] 张晓丽 SI Jiantao;ZHANG Mingli;BAI Desheng;SHAO Jiangbo;GUO Xin;SUN Jin;ZHANG Xiaoli(No.2 Institute of Geological&Mineral Resources Survey of Henan,Zhengzhou,Henan 450001)

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：《地质与勘探》2023年第3期678-690,共13页Geology and Exploration

基　　金：河南省财政地质勘查项目资金(编号:豫国土资发[2017]22号、豫自然资发[2019]22号)资助。

摘　　要：恩泽加绿岩带是坦桑尼亚重要的成矿带之一,产出了高登普莱德(Golden Pride)等多个大型金矿。通过对坦桑尼亚恩泽加绿岩带已发现的隐伏金矿床进行分析研究,结果显示恩泽加绿岩带隐伏金矿床构造控矿作用明显;高精度磁法和激电中梯测量结果显示含矿构造蚀变带具有高磁、低阻、相对高极化的特征;土壤地球化学测量结果显示成矿元素Au异常在空间分布上大于相应的含矿构造蚀变带的分布范围,其浓集方向与含矿构造蚀变带展布一致,并与指示元素As、Sb的套合性较好。根据该区域隐伏金矿床的地质、地球物理及地球化学特征,对该区隐伏金矿床的找矿标志进行了总结,明确了各找矿标志与隐伏金矿床之间的关系,并在此基础上构建了恩泽加绿岩带隐伏金矿床的综合找矿模型,该模型的应用显示了多种技术手段联合实施在寻找绿岩带型隐伏金矿床的有效性。The Nzega greenstone belt is one of the most major mineralization areas in Tanzania,and hosts the Golden Pride and other large-scale gold mines.The investigation of the discovered buried gold deposits in the Nzega greenstone belt demonstrates that structures exert a major influence over the gold deposits.High-precision magnetic technique and the IP intermediate gradient method data show that the structural alteration zone is characterized by high magnetism,low resistivity,and relatively high polarization.Soil geochemical data demonstrate that the Au anomalies cover a larger area than the corresponding ore-bearing structural alteration zone,and the concentration direction corresponds to the alteration zone distribution.The anomalies of Au agree well with those of the indicator elements As and Sb.We discovered the indications of the concealed gold deposits in this area and determined the relationship between the indicators and the deposits based on the geological,geophysical,and geochemical properties of the deposits.On the basis of the foregoing,we developed a comprehensive prospecting model for the concealed gold deposits in the Nzega green stone belt,the application of which demonstrates the effectiveness of combining various technological techniques in discovering concealed gold resources in the greenstone belt.

关 键 词：隐伏 金矿床 找矿模型 恩泽加绿岩带 坦桑尼亚 

分 类 号：P618[天文地球—矿床学]