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.

引用

页码：278 / 293

页数：16

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