Sulfoarsenic Mineralization with Gold in the Shear Zone of the Eastern Transbaikalia Branch of the Mongol–Okhotsk Suture (Pogromnoye Deposit, Eastern Transbaikalia, Russia)

Vilor, N. V.; Volkova, M. G.; Budyak, A. E.; Goryachev, N. A.; Павлова, Л. А.; Спиридонов, А. М.; Bryanskii, N. V.; Данилов, Б. С.

doi:10.1134/s1819714021040084

Cited by 4 publications

(1 citation statement)

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“…Indication of fluid flow events are well observed in the textures of the wall rock alteration zones and in the quartz-sulfide ores (see Figures 4 and 5). Therefore, it can be that one of the main factors for the ore formation is probably a change in fluid chemistry due to fluid-rock interaction, which is the result of the metasomatic replacement of the mélange rocks [54]. However, in the upper levels of the deposit, sulfide-bearing quartz veins provide evidence for crack-filling processes in the near-surface, as well as for the metasomatic replacement.…”

Section: Deposit Genesismentioning

confidence: 99%

Zun-Kholba Orogenic Gold Deposit, Eastern Sayan, Russia: Geology and Genesis

et al. 2022

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In this paper, we present a new point of view on the deposit geology and genesis of the largest gold deposit in Eastern Sayan, Zun-Kholba. Quartz–sulfide replacement ores and shallow quartz veins are of great economic importance. At the deposit, quartz–pyrite ore bodies are dominant, whereas paragenetically late base metal-bearing quartz veins occur only at shallow levels. The study of the fluid inclusions, stable isotopes (C–O–S), and mineral geothermometry allowed us to determine the P–T conditions of ore deposition. It is established that the temperature of ore formation changed from 380 to 433 °C at the deepest levels of the deposit to 316 °C at the shallowest levels. The pressure estimates for gold deposition at 570–950 bar were calculated for the 1490-m level in the center of the deposit. The determined P–T conditions can help estimate the average depth of deposit formation at about 3.6 km. Ore mineral assemblages were formed from homogeneous fluids of low to moderate salinity (2.4–7.9 wt.% eq. NaCl). The sulfur isotope composition of sulfide minerals (δ34S = 0–4.6‰), as well as pyrite geochemistry, corresponds to that of older volcanogenic massive sulfide (VMS) occurrences, which are widespread within the Eastern Sayan ophiolitic belts. Lens-like fragments of metamorphosed VMS-type sulfide ores are also present in the Zun-Kholba deposit. The oxygen isotope data indicate a metamorphic origin for the ore-forming fluids. Migrating metamorphic fluids may have become enriched in gold, sulfur, and other metals during the flow through the complex ore-hosting lithologies, including ophiolitic bodies with sulfide-rich VMS fragments that are characterized by a relatively high content of gold and related ore elements. The obtained data allow us to suggest a metamorphic devolatilization model for the genesis of the Zun-Kholba gold deposit.

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Section: Deposit Genesismentioning

confidence: 99%