Gold mineralization in explosive breccia bodies: mineralogical characterization and genetic aspects (Sentyabrsky NE Deposit, Chukotka Region, Arctic Russia)

Savva, N.E.; Kolova, E. E.; Фомина, М. И.; Kurashko, V. V.

doi:10.1007/s41063-017-0033-8

Cited by 5 publications

(1 citation statement)

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“…Over the last 20 years, in Central and West Chukotka, more than 10 epithermal gold deposits have been explored and involved in mining production, though in the second half of the 20th century they were considered unfeasible. The resource base re-evaluation, which led to the successful exploration of mining objects, was based on their comprehensive study [2][3][4][5][6][7] and on the accumulated world insight into epithermal mineralization [8][9][10][11][12][13]. The Chukchi Peninsula is located to the east of the 180 • meridian (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Au‐Ag‐S‐Se‐Cl‐Br Mineralization at the Corrida Deposit (Russia) and Physicochemical Conditions of Ore Formation

et al. 2021

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The mineral and chemical compositions of ores from the Corrida epithermal Au-Ag deposit (Chukchi Peninsula, Russia) were studied using the optical and scanning electron microscopy with X-ray energy-dispersion microanalysis. The deposit was formed at the time close to the period when the basic volume of acid magmas had been emplaced within the Okhotsk–Chukotka belt (84 to 80 Ma). The Au–Ag mineralization is distinguished with Au-Ag sulphides and selenides (uytenbogaardtite-fischesserite solid solution, Se-acanthite, S-naumannite) and Ag halides of the chlorargyrite-embolite-bromargyrite series. The ores were formed in two stages. Using microthermometric methods, it has been established that the ore-bearing quartz was formed in the medium-temperature environment (340–160 °C) with the participation of low-salt (3.55 to 0.18 wt.% NaCl eq.) hydrotherms, mostly of the NaCl composition with magnesium, iron and low-density СО2. According to our results of thermodynamic modeling at temperatures from 300 to 25 °C and data on mineral metasomatic alterations of the host rocks, the Au-Ag-S-Se-Cl-Br mineralization was formed at decreasing temperature and fugacity of sulphur (logƒS2 from −6 to −27), selenium (logƒSe2 from −14 to −35), and oxygen (logƒО2 from −36 to −62), with near-neutral solutions replaced by acid solutions. Analysis of the obtained data shows that the Corrida refers to the group of the LS-type epithermal deposits. This deposit is a new example of epithermal deposits with significant quantities of Au–Ag chalcogenides (acanthite, uytenbogaardtite, fischesserite, naumannite and others).

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