The article presents data on isotopic composition of oxygen of vein quartz and carbonates, carbon of carbonates, and sulfur of sulfdes of the Kopylovskoe, Kavkaz and Krasnoe gold deposits located within the Baikal-Patom Highland in the Ediacaran Dogaldyn (Kopylovskoe, Kavkaz) and Aunakit (Krasnoe) Formations. The oxygen isotopic composition of quartz fts a narrow range of values from +16.7 to +19.3 ‰; the calculated δ18OH2O values of the fuid showed a gradual increase in a range from Kavkaz (+9.59 to +10.59 ‰) to Kopylovskoe (+10.92 to +11.42 ‰) and Krasnoe (+12.14 to +12.94 ‰) deposits. Our data are close to ?18O values of quartz from the Sukhoi Log, Golets Vysochaishy and Verninskoe gold deposits located in the same region, thus, the fuid source is interpreted as metamorphic-hydrothermal. The oxygen isotopic composition of Fe-Mg carbonates from carbonaceous shales of the Kopylovskoe and Kavkaz deposits is close to those values of vein quartz (δ18Ocarb. = +16.64 to +18.38 ‰), whereas the ?18Ocarb. values of dolomite from quartz-carbonate veins of the Kopylovskoe deposit are signifcantly lower (+12.80 and +13.88 ‰). It is likely that the veins formed from a single evolving metamorphic-hydrothermal fuid upon oxygen isotopic fractionation between quartz and carbonate. Sulfur isotopic ratios for pyrite from the Kopylovskoe and Kavkaz deposits are overlapped: -1.68 to–11.91, and -16.86 to -6.66 ‰, respectively. The δ34S values of pyrite from the Krasnoe deposit are lower: -0.09 to -6.35 ‰. Gold-bearing galena (Krasnoe deposit) and chalcopyrite (Kavkaz deposit) from late quartz veins are also characterized by low δ34S values: -3.12 and -6.32 ‰, respectively. The δ34S values are correlated with those for metamorphic pyrite from the host Dogaldyn and Aunakit Formations, indicating a crustal source for the gold-sulfde ores.

Keywords: Lena gold province, orogenic deposits, black shales, Precambrian, ore genesis.

Funding. This work was supported by state contract of the South Urals Federal Research Center of Mineralogy and Geoecology UB RAS no. 122031600292-6.

Acknowledgements. The authors are grateful to T.A. Velivetskaya and S.G Kryazhev for performing isotope analyses. We also sincerely thanks to E.V. Belogub for discussing the article and useful comments.

Confict of interests. The authors declare that there are no conficts of interest related to this manuscript.

Author contribution. E.E. Palenova – conceptualization, investigation, writing; SA. Sadykov -analytical work. All the authors approved the fnal version of the manuscript prior to publication.

For citation: Palenova E.E., Sadykov SA. Stable isotopes (?18O, ?13C, ?34S) in ores of the Kopylovskoe, Kavkaz And Krasnoe gold deposits (Bodaibo Region) Mineralogy, 2025, 11(2), 47-69. DOI: 10.35597/2313-545X-2025-11-2-3.

Received 15.04.2025, revised 22.05.2025, accepted 01.06.2025

E.E. Palenova, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, Miass, Chelyabinsk district, Russia; palenova@mineralogy.ru

S.A. Sadykov, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, Miass, Chelyabinsk district, Russia;

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