坦桑尼亚维多利亚湖恩泽加绿岩带南带萨金格区块成矿潜力分析

Metallogenic Potential Analysis in Sagenge Block on Southern Belt of Nzega Greenstone Belt,Lake Victoria,Tanzania

在实施“一带一路”倡议进程中,非洲由于其矿产资源优势,越来越显现其举足轻重的地位,尤其是坦桑尼亚维多利亚湖绿岩带。通过分析研究大量地物化遥资料,得出萨金格区块成矿地质条件优越,位于NE与EW向构造交汇有利成矿部位,太古宙尼安萨群条带状含铁建造为富金矿源层,太古代-元古代铁镁质基性-超基性火山岩发育。区块找矿信息显著:对航磁资料处理,圈定四个高值异常区;对收集到的2830件岩石样品的分析数据,整理分析,圈定多个金异常和梯度变化带;通过遥感解译了线性构造、穹隆构造。通过野外地质调查,工作区及周边存在多个矿化点,矿化标志显著。依据区块地物化遥资料,进行综合信息成矿预测,初步圈定9个找矿靶区,为下部重点勘查指明了方向。对恩泽加绿岩带可能存在的三种主要成矿类型进行了探讨。最后得出维多利亚湖恩泽加绿岩带萨金格区块成矿潜力巨大。

During the “Belt and Road” strategy implementation process, due to mineral resource advantages, Africa has manifested its pivotal position increasingly, especially the Lake Victoria greenstone belts, Tanzania. Through analytically studied a mass of geological, geophysical, geochemical and remote sensing data have shown that metallogenic geological condition in the Sagenge block is advantageous. It is situated on the NE and EW structures intersected metallogenic favorable position. The Archean Nyanzian Group banded iron-bearing formation is a rich gold source and the Archean-Proterozoic femic basic and ultrabasic volcanic rocks well developed. The block has notable prospecting information: through aeromagnetic data processing has delineated four high abnormal places;data from the sorting and analysis of 2830 rock samples acquired have delineated multiple gold anomalies and gradient variation belts;through remote sensing has interpreted lineaments and domed structures. Through field geological investigation has found multiple mineralized points in working area and periphery with notable mineralization markers. Based on the block geological geophysical, geochemical and remote sensing data, carried out integrated information metallogenic prediction, initially delineated 9 prospecting target areas, pointed out further exploration orientation. Three main possible metallogenic types in Nzega greenstone belt have been discussed, and concluded that Sagenge block in the Nzega greenstone belt, Lake Victoria has huge metallogenic potential.