Abstract

Numerous silicate, Fe-oxide, and Cu–Au–Ag microspherules are found in Fe ores and pyroclastic rocks of the Kostenga deposit, Lesser Khingan (Far East of Russia). The silicate spherules contain immiscible Fe and Si glasses, vapor voids, and mineral inclusions. The Fe-oxide spherules host magnetite with a small amount of ilmenite and Fe-rich silicate glass. The Cu–Au–Ag spherules contain inclusions with dominant CuO in their composition. These microspherules are considered to form due to rapid uplift and degassing of liquation-differentiated ore-silicate melts. The possible volcanic formation of ores and precious metal mineralization is discussed for these types of the deposits.

中文翻译：

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俄罗斯远东 Kostenga 铁矿床矿石和火山碎屑岩中的硅酸盐、Fe-氧化物和 Au-Cu-Ag 微球粒

摘要

在小兴安省（俄罗斯远东）的 Kostenga 矿床的铁矿石和火山碎屑岩中发现了许多硅酸盐、Fe-氧化物和 Cu-Au-Ag 微球粒。硅酸盐球粒包含不混溶的 Fe 和 Si 玻璃、蒸汽空隙和矿物包裹体。铁氧化物球粒含有磁铁矿，含有少量钛铁矿和富铁硅酸盐玻璃。Cu-Au-Ag 球粒的成分中含有主要为 CuO 的夹杂物。这些微球被认为是由于液化分化的矿石-硅酸盐熔体的快速抬升和脱气而形成的。针对这些类型的矿床讨论了矿石和贵金属矿化的可能火山形成。