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MINERAL ASSEMBLAGES AND ZONATION OF THE LUGOKANSKIY ORE CLUSTER MINERALIZATION (EASTERN TRANSBAIKALIA)
Yu. O. Redin, Yu. A. Kalinin, P. A. Nevolko, M. V. Kirillov, V. V. Kolpakov
The paper discusses the main geological features, the formation sequence of mineral assemblages, and zonation of the Lugokanskiy ore cluster mineralization (Eastern Transbaikalia). There are three deposits which coincide within the small area: Lukoganskoye, Serebryanoye, and Solonechenskoye. Endogenous zonation is represented in lateral change of multistage high-temperature skarn and gold-sulphide-quartz mineralization by medium-temperature gold-polymetallic and low-temperature epithermal gold-silver, antimony, and mercury mineralization. The zonation shows up in a gradual decrease in proportion of high- and medium-temperature assemblages from the central part of the ore cluster to its borders along with declining Late Jurassic magmatism. Five gold-bearing mineral assemblages have been distinguished (earlier to latter): gold-chalcopyrite – gold-pyrite and arsenopyrite – gold-polymetallic – gold-bismuth – goldsilver, antimony, and mercury ones. New data are given on composition of native gold and ore minerals, isotope composition of sulphur in sulphides. Analysis of geological structure, mineral composition of ores, and isotope geochronological studies has indicated that mineralization within the Lukoganskiy ore cluster ispolymorphic.
Key words: gold mineralization, mineral assemblages, endogenous zonation, Eastern Transbaikalia.
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