Formation conditions of the Ganeevskoe gold deposit, Uchaly ore district: mineralogical thermometry and fluid inclusion study
M.V. Zabotina, N.N. Ankusheva, S.N. Shanina, V.A. Kotlyarov
UDК 553.2
The PT parameters of formation of gold-bearing metasomatites and quartz veinlets of the Gan-eevskoe gold deposit, South Urals, are studied. According to mineralogical thermometry, the formation temperatures of chlorite of metabasalts and gold-bearing metasomatites are 307-361 and 280-340 °С, respectively, which is consistent with fuid inclusion data (290-330 °C) (Belogub et al., 2017) and transformation of rocks under conditions of greenschist facies of metamorphism. The formation temperature of carbonate based on Mg contents is 500 °C, which is inconsistent with above temperatures and is probably caused by higher Mg contents of calcite due to magnesite inclusions. Pressure of 0.5 kbar calculated on the basis of calcite-dolomite geothermobarometer corresponds to the lower pressure boundary identifed from CO2 fuid inclusions (0.5-1.3 kbar) (Belogub et al., 2017). The volatile composition of the fuid (ppm) is as follows: H2O (97), CO2 (11), N2 (2.01) and CH4 (0.02). The СО2/(СО2 + Н2О) and СО2/СН4 ratios of 0.1 and 215.5, respectively, are similar to those of low-Au (1-2 g/t) quartz veins (Gibsher, 2011). The composition of fuid (NaCl–H2O ± KCl CO2) and the presence of high-Na micas indicate host rock-fuid interaction.
Figures 7. Tables 5. References 32.
Key words: Ganeevskoe gold deposit, formation conditions, chlorite geothermometers, calcite-dolomite geothermobarometry, high-Na mica, gas chromatography.
M.V. Zabotina, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia; mary_7-88@mail.ru
N.N. Ankusheva, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia; South Urals State University, Miass branch, ul. 8 Iyulya 10, Miass, Chelyabinsk district, 456301 Russia
S.N. Shanina, Institute of Geology of Komi Science Center UB RAS, ul. Pervomaiskaya 54, Syktyvkar, 167982 Russia
V.A. Kotlyarov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia
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МINERALOGY № 4 2018