Abstract

The article presents the results of a comparative analysis of fluorite from various mineralization types of the Saf’yanovka massive sulfide deposit in the Central Urals. The predominant green fluorite is intergrown with barite, quartz, and carbonates in hydrothermal colloform and massive pyrite, veinlet–disseminated chalcopyrite–pyrite–sphalerite and pyrite–chalcopyrite ores, as well as in hydrothermally altered rhyolite. In colloform pyrite ore, fluorite together with galena, sphalerite, chalcopyrite, fahlore, and barite fills interstices between crystals. In altered rhyolite, yellow-green fluorite occurs as veins of 1 cm thick, 2–3 cm pockets, and intergrowths with quartz, carbonate, and barite. The rare-earth element (REE) and yttrium concentrations have been determined by ICP-MS. The highest Y content (160 ppm) is measured in fluorite from metasomatic rock; the intermediate Y content (40–130 ppm) is determined in fluorite from pyrite ore, and the lowest one (4–9 ppm) is typical of fluorite from chalcopyrite–pyrite–sphalerite and chalcopyrite ore. The total REE content in fluorite is 70–150 ppm (chalcopyrite–pyrite–sphalerite and chalcopyrite ore), 100–280 ppm in pyrite ore, and reaches 180 ppm in altered rhyolites. The highest REE concentration is caused by the presence of xenotime, goyazite, monazite, barite or apatite inclusions in fluorite. The Tb/La and Tb/Ca ratios suggest that fluorite resulted from hydrothermal processes. The REE distribution patterns with an evident Eu anomaly (Eu/Eu* > 1) show enrichment in LREE. Positive Eu anomalies reflect the high-temperature conditions (≥250°C) during fluorite crystallization. The pressure-corrected (~100–150 bar) temperature of fluorite formation is 190–260°С.

中文翻译：

---

乌拉尔中部 Saf'yanovka 大型硫化物矿床矿石中的萤石：组合、成分和成因

摘要

本文介绍了对乌拉尔中部 Saf'yanovka 块状硫化物矿床各种成矿类型萤石的比较分析结果。主要的绿色萤石与重晶石、石英和碳酸盐共生在热液胶体和块状黄铁矿、细脉浸染的黄铜矿-黄铁矿-闪锌矿和黄铁矿-黄铜矿矿石中，以及热液蚀变流纹岩中。在胶状黄铁矿矿石中，萤石与方铅矿、闪锌矿、黄铜矿、法洛尔和重晶石一起填充晶体之间的空隙。在蚀变流纹岩中，黄绿色萤石以 1 厘米厚的脉、2-3 厘米的口袋形式出现，并与石英、碳酸盐和重晶石共生。稀土元素 (REE) 和钇的浓度已通过 ICP-MS 测定。最高的 Y 含量 (160 ppm) 在来自交代岩的萤石中测得；中间的 Y 含量 (40-130 ppm) 是在黄铁矿矿石的萤石中测定的，最低的 (4-9 ppm) 是典型的黄铜矿-黄铁矿-闪锌矿和黄铜矿矿石中的萤石。萤石中的 REE 总含量为 70-150 ppm（黄铜矿-黄铁矿-闪锌矿和黄铜矿矿），黄铁矿矿为 100-280 ppm，蚀变流纹岩达到 180 ppm。最高的 REE 浓度是由于萤石中存在磷钇矿、菱镁矿、独居石、重晶石或磷灰石包裹体。Tb / La和Tb / Ca之比表明萤石是水热过程产生的。具有明显 Eu 异常 (Eu/Eu* > 1) 的 REE 分布模式表明 LREE 富集。Eu 正异常反映了萤石结晶过程中的高温条件（≥250°C）。萤石形成的压力校正（~100-150 bar）温度为 190-260°С。