| 微细浸染型金矿的硅质阴极发光与成矿物源分析——以黔西南和桂西北金矿为例 |
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| 引用本文： | 卢秋霞.微细浸染型金矿的硅质阴极发光与成矿物源分析——以黔西南和桂西北金矿为例[J].大地构造与成矿学,2000,24(1):75-80. |
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| 作者姓名： | 卢秋霞 |
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| 作者单位： | 成都理工学院,四川,成都,610059 |
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| 基金项目： | 中国科学院科技攻关项目;KY85-12-04-02; |
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| 摘 要： | 应用阴极发光技术研究了微细浸染型金矿中赋矿围岩和矿石中硅质以及成矿期和表生期石英脉的阴极发光特征。结果表明 :围岩(包括石英斑岩和辉绿岩墙)中的硅质和石英及次生硅化石英均表现不同的发光特征 ,而与原生矿化有关的原生硅化石英不发光 ;其中 ,氧化矿石中的硅化石英和表生梳状石英脉在阴极发光下呈棕色 ,与赋矿围岩中碎屑石英的次生溶解加大边表现的发光特征一致。这表明氧化和表生石英的硅质来源与溶解围岩和改造原生矿石有关 ,而原生硅化石英的硅质来源与围岩(包括岩浆岩)无关 ,进而表明成矿物质并非围岩提供。结合其它方面的系列研究 ,为该类型金矿属深源流体成矿作用产物的新观点 ,即成矿物质和流体可能直接来源于深部或上地幔提供了进一步的证据。这表明 ,阴极发光技术是一种简便、可靠和实用的矿床成因研究手段。
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| 关 键 词： | 微细浸染型金矿 硅质阴极发光 二氧化硅(硅质) 石英脉 成矿物源 深源流体成矿 |
SILICEOUS CATHODOLUMINESCENCE AND ANALYSIS OF ORIGIN OF ORE MATERIALS FOR MICRO-FINE DISSEMINATED GOLD DEPOSITS -A CASE STUDY OF THE GOLD DEPOSITS IN SW GUIZHOU AND NW GUANGXI, CHINA |
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| Abstract: | Silica from host country rocks and ores and quartz veins from mineralization and epidiagenetic stages are studied with respect to those cathodoluminescence characteristics in micro disse minated gold deposits.The results show:Silica and quartz from wall rocks(containing quartz prophyry and diabase dykes)and secondary silicified quartz exhibitdifferent striking luminescence,while quartz in association with primary silicification is non luminescent.In them,silicified quartz in oxidized ores and supergene comb structured quartz veins give off brown cathodoluminescence similarto what is noted in secondary enlargement around quartz fragments in the host rocks.This suggests that the silicon in supergene quartz and secondary silicification may have been derived from dissolved wall rocks or from reworking of the primary ores,but the silicon in primary silicification must be different in origin.The results also bring to light the fact that ore forming materials do not originate from country rocks.Combining with other systematic geochemical studies,an additional evidence for a new idea that this type gold deposits are formed by juvenile fluid mineralization is expressed in this paper.In other words,the authors hold that mineralizing silica,ore forming substances and fluid may have come directly and mainly from the upper mantle.This study turns out that cathodoluminescence technique is useful in study of ore deposit origin as a simple,convenient and realiable mean. |
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| Keywords: | Micro disseminated gold deposit siliceous cathodoluminescence silica quartz vein ore materials source juvenile fluid mineralization |
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