The Nizhny Birkachan Gold-Silver Epithermal Deposit, Omolon Massif, Northeast Russia: Geological Structure, Ore Mineralogy, and Age

被引：0
|
作者：
Glukhov, A. N. [1 ]
Priymenko, V. V. [1 ]
Kotov, A. B. [2 ]
Fomina, M. I. [1 ]
Salnikova, E. B. [2 ]
Mikhalitsyna, T. I. [1 ]
Polzunenkov, G. O. [1 ]
机构：
[1] Russian Acad Sci, Shilo Northeast Multidisciplinary Res Inst, Far East Branch, Magadan 685000, Russia
[2] Russian Acad Sci, Inst Precambrian Geol & Geochronol, St Petersburg 199034, Russia
来源：
JOURNAL OF VOLCANOLOGY AND SEISMOLOGY | 2023年 / 17卷 / 04期
关键词：
low sulfide; Late Paleozoic; isotopic system; dikes;
D O I：
10.1134/S0742046323700240
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
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 & PLUSMN; 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 Ar-40/Ar-39 age equal to 169 & PLUSMN; 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.
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页码：278 / 293
页数：16
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