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    贵州戈塘金矿含矿岩系元素地球化学特征

    Element geochemistry of ore-bearing rock series in the Getang gold deposit, Guizhou Province

    • 摘要: 提要:贵州戈塘金矿储量大、品位高、成矿环境特殊,具有“层位和岩溶不整合面”双重控矿的典型特征,含矿岩系中发育多种(硅化、构造)角砾岩、低温热液矿物(雄黄、雌黄、辉锑矿和萤石等)和围岩蚀变矿物组合,热液成矿期可分为主成矿期—黄铁矿阶段和成矿晚期—萤石阶段。通过对单矿物(黄铁矿和萤石)及含矿岩系各岩石(层位)微量元素含量、Co/Ni和Th/U值、稀土元素和硫同位素(黄铁矿、辉锑矿)组成特征的系统研究。初步认为戈塘金矿具有正常海水沉积特征,矿石层位形成于海相贫氧还原环境,初始成矿物质可能与峨眉山玄武岩浆活动有关,但后期深部物质为金的进一步富集成矿贡献也较为明显。

       

      Abstract: Abstract:The Getang gold deposit in Guizhou Province has large reserves, high grade, special formation circumstances, and typical double ore-controlling characteristics: one is the horizon, and the other is the karst unconformity. There are varied (silicification, tectonic) breccias, low-temperature hydrothermal minerals (realgar, orpiment, stibnite and fluorite etc.) and wall rock alteration mineral assemblages in the ore-bearing rock of the Getang gold deposit. Its hydrothermal ore-forming stage can be divided into two metallogenic stages. The first is the main ore-forming stage—pyrite stage and the second is the late ore-forming stage—fluorite stage. Based on a systematic study of trace elements (Co/Ni and Th/U), REE, sulfur isotopes (pyrite and stibnite) composition characteristics of single minerals (pyrite and fluorite) and ore-bearing rocks (horizon), the authors tentatively hold that the Getang gold deposit possesses normal seawater sedimentation characteristics, its ore-bearing layer was developed in a marine and poor oxygen environment, and the initial ore-forming material was probably related to Emeishan basalt activity, but late deep material may have had contributions to mineralization for further enrichment of Au.

       

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