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GOLD-QUARTZ MINERALIZATION CONDITIONS IN THE ORTON-FEDOROVKA ORE-PLACER CLUSTER (MOUNTAINOUS SHORIA)
V. V. Kolpakov, P. A. Nevolko, Yu. A. Kalinin, M. V. Kirillov, A. A. Shadrina, Yu. O. Redin, V. F. Dultsev
Gold mineralization in the Orton-Federovka ore cluster is of gold-quartz formation. Ore bodies of Federovskoye and Kedrovskoye deposits and Lazaretnoye ore manifestation are linear-stockwork vein-metasomatic zones. Besides, within the ore cluster there are widespread quartz veins with usually poor gold content. They are considered by the example of the Ortonskoye ore manifestation. Quartz-vein and linear-stockwork mineralization types are close in age (С1–Р1), but they are substantially different in formation and localization features, which is due to different geological positions. Gold content of Orton-type quartz veins is controlled by prevailing early stage of gold-quartz mineralization. Ore-bearing hydrothermal fluid was poorly saturated with gold. Linear-stockwork mineralization hosting the major gold content in the Orton-Fedorovka ore cluster was formed in the halo of rocks with increased gold content, evolved by intrusion of Sadra granitoids. Mineralization evolved involving deep (mantle) matter source in two stages corresponding to the Late Caledonian and Hercynian epochs of tectonic-magmatic activity in the region. Major gold content was formed in the late stage of mineralization.
Key words: gold mineralization, formation conditions, mineralization age, native gold, fineness of gold.
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