河南栾川三道庄钼(钨)矿床构造蚀变岩相分带特征

    Zoning regularity of the tectonic altered lithofacies in the Sandaozhuang Mo (Wu) deposit, Luanchuan, Henan Province

    • 摘要: 围绕南泥湖钼(钨)矿床1:10000构造蚀变岩相填图,以1:2000地质实测剖面为基础,通过显微镜下鉴定,观测三道庄钼(钨)矿床各构造蚀变岩相带标志性蚀变矿物、矿物组合特征和矿物含量变化特点。综合野外及镜下观察分析,提出三道庄钼(钨)矿床围岩发生了接触热变质和热液交代变质2种蚀变类型,其中,热接触变质划分为石英岩带、黑云母长英角岩带与透辉石长英角岩带3个构造蚀变岩相带;热液交代蚀变岩划分出矽卡岩带和矽卡岩化钙硅酸角岩带2个构造蚀变岩相带。先从宏观到微观逐步深入地开展研究,总结矿床围岩的构造蚀变岩相分带及分布特征,再从显微角度来验证并支撑野外构造蚀变岩相分带的正确性,最后编制了三道庄钼(钨)矿床围岩构造蚀变岩相分带图。本研究为探讨斑岩-矽卡岩型钼(钨)矿床的成矿规律提供了新的工作思路和实际测量填图成果,在岩相结合构造研究领域具有重要的理论意义和应用价值。

       

      Abstract: Based on the a 1:10000 tectonic altered lithofacies mapping and 1:2000 measured section, this paper takes the Sandaozhuang Mo (Wu) deposit as the study area, and comprehensively observed the typical altered minerals and mineral assemblage features of the tectonic altered lithofacies zones, researches the typical character of mineral assemblages and content change. Combined with the analyses of field work and microscopic observation, we presented two alteration types of the Sandaozhuang Mo (Wu) deposit, i.e. thermo-contact and hydrothermal metasomatism. Thermo-contact metasomatism included quartzite zone, biotite-felsic hornfelsic zone, diopside-felsic hornfelsic zone, and hydrothermal metasomatism included skarn zone and calc-silicate skarnization-hornfelsic zone. This paper summarized the characteristics of structural altered lithofacies belts from the conduct of macroeconomic and microeconomic analysis, and then compiled structural altered lithofacies zoning map of the wall rock in Sandaozhuang Mo (Wu) deposit. This research provides new thinking and achievement on the regularity of ore formation of porphyre-skarn Mo (Wu) deposit, which shows important theoretical significance and application value between petrography and structure.

       

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