Gold-Silver Epithermal Deposit the Lower Birkachan (Omolonsky Massif, North-East of Russia): Geological Structure, Ore Mineralogy, Age

Described of structure, mineralogy and age of ore and hosted rocks of the recently explored Nizhniy Birkachan Au-Ag epithermal deposit. The orebodies is a quartz-carbonate-adularia veins and veining zones, that hosted porphyry granodiorites with U-Pb age (ID-TIMS) 335 ± 2 Ma. The ore contain low sul...

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Veröffentlicht in:Вулканология и сейсмология 2023-07, Vol.17 (4), p.23-38
Hauptverfasser: Glukhov, A. N., Priymenko, V. V., Kotov, A. B., Fomina, M. I., Salnikova, E. B., Mikhalitsyna, T. I., Polzunenkov, G. O.
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Sprache:eng
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Zusammenfassung:Described of structure, mineralogy and age of ore and hosted rocks of the recently explored Nizhniy Birkachan Au-Ag epithermal deposit. The orebodies is a quartz-carbonate-adularia veins and veining zones, that hosted porphyry granodiorites with U-Pb age (ID-TIMS) 335 ± 2 Ma. The ore contain low sulfides, low Ag grades. Main ore minerals – pyrite. Silver minerals represented by tennantite-tetraedrite, Ag sulfide, native Au and Ag, gessite, The 40Ar/39Ar age of adularia from vein 169 ± 4 Ma. This young age we explain by rejuvenation of isotope system after intrusion of non-mineralizied Jurassic mafic dykes. The main features of Nizhniy Birkachan Au-Ag epithermal deposit similar with other Au-Ag deposits of Kedon magmatic belt of the Omolon massif. All that was formed in 290–335 Ma age interval.
ISSN:0203-0306
DOI:10.31857/S0203030623700220