| 潘刚,徐明钻,许生武,刘峰.莫桑比克米卢里河上游砂金区金地球化学背景研究及找矿指示[J].矿产勘查,2025,16(6):1397-1408 |
| 莫桑比克米卢里河上游砂金区金地球化学背景研究及找矿指示 |
| Geochemical background of gold and prospecting indicators in the upper Meluli River Placer gold area, Mozambique |
| 投稿时间：2023-02-08 |
| DOI：10.20008/j.kckc.202506009 |
| 中文关键词: 原生金 石英脉 岩石地球化学测量 找矿指示 矿源层 莫桑比克 |
| 英文关键词: primary gold quartz vein geochemical survey of rocks prospecting indication source bed Mozam. bique |
| 基金项目:本文受江苏省地质矿产勘查局项目“2019年度江苏省省外、国外矿产资源风险勘查(苏地矿发〔2019〕105号)”资助。 |
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| 中文摘要: |
| 为探讨米卢里河上游砂金分布区金物质来源，寻找原生金矿找矿线索，本文系统分析了研究区主要地质单元岩石样品的金含量，分析结果显示“泛非期”淡色含石榴子石花岗岩和含石榴子石伟晶岩具有较高的金含量，与成矿作用关系密切，是区域原生金矿的矿源层。通过对矿化异常进行工程验证，成功发现地表原生金矿体 2条，品位均在 10×10-6以上，赋矿脉体为岩浆热液石英脉，该类脉体围绕含石榴子石伟晶岩发育，围岩为莫罗奎组软弱岩层。在此基础上得出金矿的形成受淡色含石榴子石花岗岩、含石榴子石伟晶岩、D3期韧性变形构造以及围岩条件等多重因素控制的结论，认为莫罗奎组中节理、裂隙及微断层发育的虚弱部位，同时分布淡色含石榴子石花岗岩、含石榴子石伟晶岩和岩浆热液石英脉的地区是成矿有利地段，对于区域找矿具有重要的指示意义。 |
| 英文摘要: |
| This study aims to investigate the source of gold material in the placer gold distribution area of theupper Meluli River and identify prospecting indicators for primary gold deposits. This paper employs systematicanalysis of gold content in rock samples from major geological units. The results reveal that Pan-African-periodgarnet-bearing leucogranites and garnet-bearing pegmatites exhibit anomalously high concentrations of gold. Thisexplains their close genetic relationship with gold mineralization processes andtheir roleas the source beds for re.gional primary gold deposits. Following engineering verification, two surface primary gold orebodies were discov.ered, both grading in excess of 10×10-6. The ore-hosting veins are magmatic-hydrothermal quartz veins that occurwithin soft and weak rock layers of the Molocue Formation and are adjacent to garnet-bearing pegmatites. The studyconcludes that gold mineralization is jointly controlled by multiple factors: garnet-bearing leucogranites, garnet-bearing pegmatites, D3-phase ductile deformation structures, and favorable wall-rock conditions. It proposes thatprospective metallogenic areas in the Molocue Formation are characterized by structurally weak zones with devel.oped joints, fractures, and micro-faults, where garnet-bearing leucogranites, garnet-bearing pegmatites, andmagmatic-hydrothermal quartz veins coexist. These findings provide significant guidance for regional prospectingefforts. |
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