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    甘肃寨上金矿床中白钨矿矿体的发现及其特征

    Discovery and significance of scheelite orebodies in the Zhaishang gold deposit, southern Gansu

    • 摘要: 提要:位于西秦岭礼(县)—岷(县)成矿带西段的寨上金矿床,是近年发现的一个大型微细浸染型金矿。在研究甘肃寨上金矿床物质组分的过程中,笔者通过对岩矿石的等离子质谱分析和对矿物的反光显微镜下观察、电子探针分析,发现寨上金矿床存在白钨矿的富集体。根据化学成分圈定出了独立的白钨矿矿体,确认该矿床为金-钨-锑 (自然金-白钨矿-辉锑矿)建造矿床。其与四川西北部马脑壳金-钨-锑矿床在地质背景、含矿岩石、矿化形式、矿物组合、元素组合和成矿过程相似。鉴于在川甘陕三角地带泥盆系—三叠系中类似寨上的金矿床、矿点众多,注意在此类金矿中分析和评价钨等有用组分,对提高金矿的综合利用价值是十分重要的。

       

      Abstract: Abstrate:Located in the western part of the Min-Li metallogenetic belt, wetern Qinling Mountains, the Zhaishang gold deposit is a recently discovered large Carlin-type disseminated gold deposit. Examination of ores by optical microscope, EPMA and ICP-MS from the the deposit, has revealed a scheelite enrichment. On the basis of chemical-analytical data, several independent scheelite orebodies are located. It belong to Au-Sb-W deposit association of gold-scheelite-stibnite. In some ways, it can be compared with the Manaoke gold deposit in Sichuan with respect to geological setting, host lithology, mineralization style, mineral assemblages, geochemical association and metallogenic processes involved. Since in the Devonian and Triassic strata in the triangular border region of Sichuan, Gansu and Shaanxi provinces, as so-called golder trangle, coith many gold deposits or occurrences similar to the Zhaishang deposit,it is obviously of great importance to evaluate the value of tungsten and other elements in these gold deposits.

       

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