MINERAL COMPOSITION AND MAJOR GENETIC FEATURES OF SILVER-POLYMETALIC MINERALISATION OF THE MOCHISHCHENSKY BUNCH (NOVOSIBIRSK OB REGION, WESTERN SIBERIA)

A. A. Redina 1, S. R. Osintsev 1, Yu. O. Redin 1, 2

1 V.S. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia; 2 Novosibirsk State University, Novosibirsk, Russia

The Mochishchenskoye silver-polymetallic mineralisation is located in the Mochishchensky leucogranite bunch. The article contains results of studying material compositi on and physical and chemical conditions of mineralisation. Major ore minerals there are pyrite, galena, and sphalerite. The X-ray spectroscopy identified characteristic stable inclusions in sphalerite (Fe, Mn, Cd) and galena (Ag, Bi, Ga). During the study, for the first time the authors identified three mineral forms of silver occurrence in ores: canfieldite (Ag8SnS6), hessite (Ag2Te), and schapbachite (AgBiS2). The study of isotope composition of sulphur of sulphide minerals indicates the endogenous source of sulphur in the ore minerals. According to cryo- and thermometric analysis, the mineralisati on occurred from moderate- and high-concentration solutions at a wide range of temperature (190–390°С). The gas fluid phase had a carbon-dioxide composition and contained N2 and CH4.

Key words: silver-polymetallic mineralization, mineral composition, formation conditions

DOI 10.20403/2078-0575-2017-1-80-88

Download PDF