Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

The Ulug-Sair Gold-Bismuth Ore Occurrence (Western Tuva, Russia): PT Parameters, The Composition of Fluids, and Isotopy of S and O

Version 1 : Received: 9 March 2022 / Approved: 10 March 2022 / Online: 10 March 2022 (09:26:02 CET)

How to cite: Kuzhuget, R.V.; Ankusheva, N.N.; Mongush, A.A.; Butanaev, Y.V.; Suge-Maadyr, N.V. The Ulug-Sair Gold-Bismuth Ore Occurrence (Western Tuva, Russia): PT Parameters, The Composition of Fluids, and Isotopy of S and O. Preprints 2022, 2022030142 (doi: 10.20944/preprints202203.0142.v1). Kuzhuget, R.V.; Ankusheva, N.N.; Mongush, A.A.; Butanaev, Y.V.; Suge-Maadyr, N.V. The Ulug-Sair Gold-Bismuth Ore Occurrence (Western Tuva, Russia): PT Parameters, The Composition of Fluids, and Isotopy of S and O. Preprints 2022, 2022030142 (doi: 10.20944/preprints202203.0142.v1).

Abstract

We examined PT parameters, geochemical peculiarities, and fluid sources of the Ulug-Sair ore occurrence attributable to class of intrusion-related gold deposits and according to ore mineral assemblages corresponding to Au-Bi type with wide Bi minerals (AgBiTe, Bi2Te2Se, Cu3,07BiS3, Bi), tellurides (Au and Ag), Se-tellurides (Ag and Bi), and selenides (Au, Ag, and Hg). We identified that ‘pre-gold’ quartz-tourmaline veins were deposited using an aqueous Mg-Na-K-chloride fluid with a salinity of 8–10 wt % NaCl eq. At 325–370 °C; host breasts were formed due to a CO2-water fluid containing CH4 and N2, with a salinity of 0,18–6,1 wt % NaCl eq. at least 200–400 °C. Gold-bearing mineral assemblages were formed at P ~ 0,75–1,0 kbar (~ 2,3–3 km) due to CO2-water chloride (Na-K±Fe, Mg) fluid with CH4, Na2SO4, and Na2B2O5, and salinities 1,7–12,5 wt % NaCl eq. during the decreasing temperatures from 360 up to 115 °C (gold-sulfide-quartz veins – 360–130 °С, and gold-telluride-sulfide-quartz veins – 330–115 °C) and variations fO2, fS2, fSe2, and fTe2. The isotopic composition of δ34SH2S fluid (-0,7…+2,5 ‰) indicates the juvenile or magmatic origin of fluid and ore elements. The δ34OH2O fluid indicates that, at an early substage, the formation of ore occurrence involved a fluid of magmatic or metamorphic origin (+7,3…+11,4 ‰), and, in the later substage, it mixed with meteoric waters (-2,3…+9,1 ‰).

Keywords

gold; fluid inclusions; quartz; stable isotopes; gold deposits; Western Tuva

Subject

EARTH SCIENCES, Geology

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.