Abstract

The article discusses the features of the composition, age, and genesis of gold–antimony mineralization of the East Sayan based on the example of the largest Tumannoe ore occurrence. It is shown that objects of this type are rare in the considered region. In the course of studies, it was found that stibnite, pyrite, and arsenopyrite predominate in ores; Bi minerals (tetradymite, cobaltite, native Bi), antimonides and sulfosalts (zinkenite, chalcostibite, aurostibite, tetrahedrite, and andorite), and three generations of native gold are also present. The mineralization contains gold–bismuth and gold–antimony ore assemblages, which are the evolutionary products of a single ore-forming system, during which a sequential decrease in the PTX parameters of ore deposition occurred, where temperatures decreased from more than 380 to 180°С. Sulfur activity decreased during ore deposition, which led to the deposition of alternating ore assemblages from simple sulfides to sulfosalts, in the direction of increasing deposited components, and to the formation of different generations of native gold with a gradual increase in fineness from early to late assemblages. The results of mineralogical–genetic and isotope–geochemical studies evidence the magmatogenic nature of gold–antimony mineralization. The isotopic age of parent granitoids, obtained by LA-ICP-MS zircon dating, is Early Ordovician; age values are 491–486 Ma. ⁴⁰Ar/³⁹Ar dating of muscovite from ore veins shows a relatively young age value (439 Ma), which is due to the influence of late tectonic and thermal events associated with the Early Paleozoic orogeny occurred at that time throughout the territory of the present-day East Sayan.

中文翻译：

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Tumannoe金锑矿床（俄罗斯东萨彦）：矿物学，流体包裹体，S和O同位素，U-Pb和40 Ar / 39 Ar年龄

摘要

本文以最大的图曼诺矿石出现为例，讨论了东萨彦地区金锑成矿的成分，年龄和成因特征。结果表明，这种类型的物体在所考虑的区域中很少见。在研究过程中，发现矿石中主要存在辉锑矿，黄铁矿和毒砂。还存在Bi矿物（四硼铁矿，钴矿，天然Bi），锑化物和硫盐（锌矿，黄铜矿，尖晶石，四面体和红柱石）以及三代天然金。矿化包含金-铋和金-锑矿组合，它们是单个成矿系统的演化产物，在此期间PTX依次下降发生了矿石沉积的参数，温度从380多个降到180°С。矿石沉积过程中硫的活性降低，这导致了从简单的硫化物到亚硫酸盐的交替矿石组合的沉积，朝着沉积成分增加的方向沉积，并形成了不同世代的天然金，其成色从早期到晚期逐渐增加的集合。矿物学，同位素学和地球化学研究的结果证明了金锑矿化的成岩作用。通过LA-ICP-MS锆石测年获得的母体类花岗岩的同位素年龄为奥陶纪早期。年龄值是491–486 Ma。⁴⁰氩/ ³⁹矿脉中白云母的Ar年龄显示相对年轻的年龄值（439 Ma），这是由于当时整个现今东萨彦岭地区发生的与早古生代造山运动有关的晚期构造和热事件的影响。