摘要
PL10451 金矿区位于坦桑尼亚环维多利亚湖太古宙绿岩带型金矿成矿区的Ⅱ级成矿带-恩泽加成矿带上,该成矿带构造发育,岩浆活动强烈,成矿环境优越,找矿潜力巨大.通过大比例尺地质、物化探和深部钻孔验证等方法手段,在研究区内共发现4 条含矿构造蚀变带,圈定4 条金矿体.初步研究成果表明:研究区金矿成矿类型为受剪切带控制的构造蚀变岩型金矿,矿(化)体围岩蚀变特征明显,其中硅化、绿泥石化、黄铁矿化、褐铁矿化与金矿化关系最为密切,矿石矿物共生组合以自然金+黄铁矿+石英+绿泥石为主,金矿(化)体具有"中低阻-相对高极化"的激电异常特征.初步认为区内近南北向构造带、物化探异常结合部位等是成矿有利部位,可以作为下步主要找矿方向.
Abstract
The PL10451 gold mining area is located in the II-level metallogenic belt—the Enzega metallogenic belt of the Archean greenstone belt type gold metallogenic area around Victoria Lake in Tanzania.This metallogenic belt is characterized by developed structure,strong magmatic activity,a superior metallogenic environment,and great prospecting potential.Through large-scale geological,geophysical,and geochemical exploration,as well as deep borehole verification,four ore-bearing structural alteration zones were identified in the study area,and four gold orebodies were delineated.Preliminary research results indicate that the gold deposits in the study area are of the tectonic altered rock type,controlled by shear zones,with distinct wall rock alteration characteristics.Specifically,silicification,chloritization,pyritization,and limonitization are most closely associated with gold mineralization.The ore mineral assemblage primarily consists of native gold,pyrite,quartz,and chlorite,and the gold deposit(mineralization)body exhibits characteristics of'medium-low resistance,high polarization'induced polarization anomalies.It is preliminarily considered that the near north-south trending tectonic belt and the junction of geophysical and geochemical anomalies are favorable areas for mineralization and can serve as the main prospecting direction for future work.
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