埃塞俄比亚Guba金矿地质地球化学特征及找矿预测  

Geologicai-geochemical characteristics and prospecting prediction of Guba gold deposit in Ethiopia

作　　者：付中 王东方 苗磊 FU Zhong;WANG Dongfang;MIAO Lei(No.4 Institute of Geological&Mineral Resources Survey of Henan,Zhengzhou 451464,Henan,China)

机构地区：[1]河南省地质矿产勘查开发局第四地质矿产调查院,河南郑州451464

出　　处：《矿产勘查》2021年第12期2393-2402,共10页Mineral Exploration

摘　　要：埃塞俄比亚西部的前寒武纪变质岩系是该国重要的贵金属成矿区。Guba金矿研究区民采金活动活跃,区域水系化探和重砂测量显示金分布广泛。研究区金矿化体呈脉状赋存于前寒武纪Guba群云母石英片岩中,受韧性剪切带及走滑断裂带控制。M1金矿体品位ω(Au)0.89×10^(-6)~18.14×10^(-6),平均厚度0.93 m,围岩蚀变主要为硅化、褐铁矿化、绢云母化。区内土壤化探测量结果显示,Au在构造带、混合花岗岩分布区富集明显,元素异常主要分布于构造交汇区域,异常规模大、衬度高、浓度分带清晰。通过建立找矿模式、综合地质、化探特征和矿化规律,预测了两个有利的找矿靶区。The Precambrian metamorphic rocks in western Ethiopia is an important precious metal metallogenic region.Gold mining activities are active in Guba,and regional water geochemical exploration and heavy sand survey show that gold is widely distributed.The gold mineralized bodies occur as veins in sericite quartz schist of Precambrian Guba group in the study area,which are controlled by ductile shear zone and strike slip faults.M1 gold ore body is 0.89×10^(-6);~18.14×10^(-6);,with an average thickness of 0.93 meter.Wall rock alteration is mainly silicification,limonitization and sericitization.The results of soil geochemical survey show that Au is obviously enriched in the structural belt and migmatite,and the element anomalies are mainly distributed in the structural intersection area,with large scale,high anomaly value and obvious concentration zoning.Through the establishment of prospecting model,comprehensive geological,geochemical and mineralization characteristics,two favorable prospecting targets are predicted.

关 键 词：金矿化 韧性剪切带 走滑断层 化探异常 Guba 

分 类 号：P612[天文地球—矿床学]