黔西南晴隆锑矿床硅化对锑成矿的控制机制
Controlling mechanism of antimony mineralization by silicification in the Qinglong Sb deposit in the SW Guizhou,China
查看参考文献29篇
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文摘
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贵州晴隆锑矿床是右江盆地低温热液矿集区代表性锑矿床,硅化普遍发育。本文通过系统的岩相学研究,认为晴隆锑矿床硅化可分为3期:第1期硅化主要形成于大厂层沉积-成岩自蚀变过程,表现为火山玻屑脱玻化重结晶作用;第2期硅化与锑矿化关系密切;而第3期硅化为热液成矿晚阶段产物,与晚期脉状锑-金矿化相关。围岩、硅化围岩和矿石主微量元素分析显示,富Si流体呈酸性使灰岩中大量的CaCO_3矿物溶解,同时伴生强烈的热液钾化蚀变,Sb、As、Au、S、K等元素由热液带入,Ca和Na为带出。综合分析认为,大厂层不仅为流体运移提供通道,同时为成矿提供了的充足空间和水/岩反应物质基础,如为硫化物沉淀和脉石(方解石和萤石)沉淀提供Fe和Ca等。 |
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其他语种文摘
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The Qinglong Sb deposit is a representative antimony deposit in the low-temperature metallogenic area of the Youjiang Basin,and is characterized by abundant silicification.In this paper,three stages of the silicification has been identified based on detailed petrographic observation.The Stage I silicification is considered to have occurred mainly in the sedimentary-diagenetic self-alteration process in form of the devitrification and recrystallization of volcanic glass debris.The Stage II silicification is closely associated with the Sb mineralization.The Stage III silicification,occurred in the late hydrothermal ore-forming stage,is closely related to the veined Sb-Au mineralization.The analytical results of major and trace elements of wall rocks,altered wall rocks,and ores suggest that the acidic Si-rich fluid caused the dissolution of a large amount of CaCO_3 mineral in the limestone,and the strong hydrothermal potassic alteration of wallrocks.In the altered wallrocks contents of Sb,As,Au,S,and K elements were increased but contents of Ca,and Na were decreased comparing to the unaltered wallrocks,indicating that Sb,As,Au,S,and K were enriched but Ca and Na were depleted in the altered wallrocks.Based all the above,it is believed that the Dachang layer could provid not only the passage of the ore-forming fluid,but also the sufficient space for mineralization and the material basis for element exchange of the rock-water interation,for example,it could provide Fe and Ca to have formed gangue minerals (fluorite and calcite) as well as sulfides. |
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来源
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矿物学报
,2022,42(5):605-617 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2022.42.068
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关键词
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硅化
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大厂层
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晴隆锑矿床
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黔西南
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右江盆地
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地址
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贵州大学资源与环境工程学院, 贵州, 贵阳, 550025
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中国黄金集团贵州有限公司, 贵州, 贵阳, 550002
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贵州大学, 喀斯特地质资源与环境教育部重点实验室, 贵州, 贵阳, 550025
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贵州省有色金属和核工业地质勘查局物化探总队, 贵州, 都匀, 558000
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金
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中国科学院贵阳地球化学研究所矿床地球化学中国科学院重点实验室基金
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贵州大学培育项目
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文献收藏号
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CSCD:7267032
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