Abstract

The article describes magnetite–sulfide assemblages of minerals containing native gold and tellurides in the Pb–Zn–Fe ores of the Aktash skarn deposit in Western Karamazar (Tajikistan). Gold–silver–telluride mineralization is represented by products of a multistage ore process. It has been established that native gold is concentrated both in magnetite and in association with sulfide minerals. A decrease in the fineness of native gold from its early to late varieties was revealed: 725–905‰ in magnetite → 656–699‰ in pyrite-pyrrhotite ores → up to 290‰ in association with galena and bismuth-bearing minerals. The regular decrease in the fineness of native gold and paragenetic relationship with various bismuth minerals (native bismuth, bismuthite, aikinite, Ag–bearing aikinite, uytenbogaardtite, Ag–Au–Bi–S phases) reflect a decrease in temperature and sulfur fugacity of mineral-forming fluids. Tellurides are found in magnetite-chalcopyrite-pyrite-pyrrhotite ores and are represented by tsumoite, pilsenite, hessite and stützite. Electron backscatter diffraction (EBSD) patterns of tsumoite and pilsenite confirmed the predominant presence of tsumoite in the ores.

中文翻译：

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Aktash 矽卡岩矿床 Pb-Zn-Fe 矿石中的金-碲化物矿化（西卡拉马扎尔，塔吉克斯坦）

摘要

该文章描述了在西卡拉马扎尔（塔吉克斯坦）阿克塔什矽卡岩矿床的 Pb-Zn-Fe 矿石中含有天然金和碲化物的磁铁矿-硫化物组合。金-银-碲化物矿化以多阶段矿石过程的产物为代表。已经确定天然金既集中在磁铁矿中，又与硫化物矿物结合。原生金的细度从早期品种到晚期品种有所下降：磁铁矿中的 725–905‰ → 黄铁矿-磁黄铁矿中的 656–699‰ → 与方铅矿和含铋矿物相关，最高可达 290‰。天然金细度的规律性下降以及与各种铋矿物（天然铋、铋矿、aikinite、含Ag aikinite、uytenbogaardtite、Ag-Au-Bi-S 相）反映了成矿流体的温度和硫逸度的降低。碲化物存在于磁铁矿-黄铜矿-黄铁矿-磁黄铁矿矿石中，代表为tsumoite、pilsenite、hessite和stützite。tsumoite 和 pilsenite 的电子背散射衍射 (EBSD) 图案证实了矿石中的 tsumoite 的主要存在。