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

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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container_title Вулканология и сейсмология
container_volume 17
creator Glukhov, A. N.
Priymenko, V. V.
Kotov, A. B.
Fomina, M. I.
Salnikova, E. B.
Mikhalitsyna, T. I.
Polzunenkov, G. O.
description 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.
doi_str_mv 10.31857/S0203030623700220
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title Gold-Silver Epithermal Deposit the Lower Birkachan (Omolonsky Massif, North-East of Russia): Geological Structure, Ore Mineralogy, Age
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