Aurostibite, silver-bearing gold and electrum in the Darasun deposit (Eastern Transbaikalia)

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Marco E. Ciriotti
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Aurostibite, silver-bearing gold and electrum in the Darasun deposit (Eastern Transbaikalia)

Messaggio da Marco E. Ciriotti » dom 12 giu, 2022 10:24

Referenza:
▪ Spiridonov, E.M., Krivitskaya, N.N., Brysgalov, I.A., Kochetova, K.N., Korotaeva, N.N. (2022): Aurostibite, Silver-Bearing Gold and Electrum as a Part of the Postgold Antimony Mineralization in the Darasun Deposit (Eastern Transbaikalia). Zapiski RMO, 151(2), 23-35.

Abstract non disponibile. Traduzione dal cirillico:
The Late Jurassic orogenic volcanogene-plutonogenic gold deposit Darasun of the beresite-listvenite gold-sulphide-quartz formation is situated inside Mesozoids of the Eastern Transbaikaliar segment of the Mongolo-Okhotsk folded belt. The deposit includes Au-Bi and the postgold antimony mineralization. Carbonate-quartz-sulphide veins in the western part of the deposit are composed of gabbroids, gabbro-amphibolites and, lesser, of ultrabasites. They are surrounded by listvenite halos, and their rich-in-gold ores were formed under conditions of the low aS2; they contain pyrrhotite, arsenopyrite, chalcopyrite, bismuthinite and Pb-Bi sulphosalts associated with the high fineness gold (949–935 ‰). Pseudomorphs of aurostibite after gold minerals have appeared there due to overlapping of the antimony mineralization with native antimony. The specificity of Darasun ores is that a significant part of aurostibite metacrystals was developed inside the earlier gold mineralization, especially in brecciated spots.
Marco E. Ciriotti

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