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The Nizhny Birkachan Gold-Silver Epithermal Deposit, Omolon Massif, Northeast Russia: Geological Structure, Ore Mineralogy, and Age
Journal of Volcanology and Seismology ( IF 0.7 ) Pub Date : 2023-08-22 , DOI: 10.1134/s0742046323700240
A. N. Glukhov , V. V. Priymenko , A. B. Kotov , M. I. Fomina , E. B. Salnikova , T. I. Mikhalitsyna , G. O. Polzunenkov

Abstract

We have studied the geological structure, material composition of the ores, and the age of the Nizhny Birkachan volcanogenic gold–silver deposit discovered recently. The ore bodies consist of veins and vein-streak zones of adularia-carbonate-quartz composition; they lie in granodiorite porphyries with U‒Pb zircon age (ID-TIMS) equal to 335 ± 2 Ma. The ores are low sulfide, low silver (Au/Ag = 1–2), with pyrite dominating the ore minerals. The Ag minerals are tennantite, Ag sulfide, native gold and silver, and hessite. From an ore vein we obtained an adularia-based 40Ar/39Ar age equal to 169 ± 4 Ma, which reflects the rejuvenation of the isotopic argon system after the emplacement of a dike of unaltered Jurassic basites that cuts through the ore body. The Nizhny Birkachan deposit has a geological structure and ore composition that are very similar to those of other Au-Ag deposits at the Kedon volcano-plutonic belt such as Kubaka and Birkachan; it was also formed in the age span 290–335 Ma.



中文翻译:

俄罗斯东北部奥莫隆地块下比尔卡尚金银浅成热液矿床:地质结构、矿石矿物学和年龄

摘要

我们研究了最近发现的下比尔卡尚火山金银矿床的地质结构、矿石的物质成分和年龄。矿体由矿脉和脉纹带组成,其成分为阿杜拉利亚-碳酸盐-石英;它们位于花岗闪长斑岩中,U-Pb 锆石年龄 (ID-TIMS) 等于 335 ± 2 Ma。矿石为低硫化物、低银(Au/Ag = 1–2),矿石矿物以黄铁矿为主。银矿物有铁锰矿、硫化银、天然金银和铁锰矿。从矿脉中,我们获得了基于阿杜拉利亚的40 Ar/ 39 Ar 年龄,等于 169 ± 4 Ma,这反映了在穿过矿体的未改变的侏罗纪基岩岩脉就位后,同位素氩系统的恢复。 Nizhny Birkachan 矿床的地质结构和矿石成分与 Kedon 火山-深成带的其他金银矿床(如库巴卡和比尔卡昌)非常相似;它也形成于290-335 Ma的时代。

更新日期:2023-08-22
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