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UDC (553.3/.6.061.2+553.8.061.2):552.2(571.15) MAGMATISM AND MINERALISATION AT THE YUZHNO-KALGUTINSKOYE FIELD, GORNY ALTAI
The paper considers magmatism and mineralisation at the Yuzhno-Kalgutinskoye field in the Gorny Altai. The eastern part of the Kalgutinsky plutonic intrusion, small intrusion of binary granite and ongonite and elvan courses are characterised, age of their formation is provided. A direct correlation between high wolframium concentrations in rocks and maximum values of tetrad effect of fractionation of M-type rare earth elements was stated. The following mineralisation types were defined and characterised: quartz-carbonate-wolframitefluorite vein mineralisation, quartz-beryl-wolframite-fluorite greisen mineralisation, and copper-molybdenumporphyry mineralisation in fluid-explosive breccia. Major mineralisation is confined to ore zone 1, which has zonal structure in vertical direction. At the near-surface horizons the zone contains beresites, and below 150 m they change to greisens. Prevailing minerals are wolframite, beryl, scheelite, tungstite, chalcopyrite and other ore minerals, as well as fluorite and baryte mineralisation. The percent composition of elements in ore varies as follows: 0.1 to 1.8 wolframium, 0.01 to 0.9 molybdenum, 0.05 to 1.1 beryllium, 0.2 to 0.9 cuprum, 0.01 to 0.6 bismuth. According to carbon and oxygen isotope analysis, mineralisation occurred due to mixture of juvenile and crust materials. Trans-magmatic fluids are assumed to had been involved in generation of the Yuzhno-Kalgutinskoye magmatic-ore-metasomatic system.
Key words: granite, leucogranite, ongonite, elvan, ore composition, ferberite, beryl, molybdenite, fluorite, chalcopyrite, carbon, oxygen, and sulfur isotopes.
DOI 10.20403/2078-0575-2016-2-110-120 |
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