THE RAIGORODOK STOCKWORK GOLD-SULFIDE-QUARTZ DEPOSIT IN THE NORTH KAZAKHSTAN GOLD ORE PROVINCE
K.R. Kovalev1, S.O. Syzdykov2, Yu.A. Kalinin1,3, E.A. Naumov1,3, V.V. Baranov2, V.P. Sukhorukov1,3, A.S. Gladkov4, F.I. Zhimulev1
1V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2RG Gold LLP, Abylaikhan Str. 73, 3-4 fl., Akmola Region, Burabay area, Shchuchinsk, 021700, Republic of Kazakhstan
3Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
4Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
Keywords: Северо-Казахстанская золоторудная провинция, месторождение золота Райгородок, прожилково-вкрапленные руды, Au-Cu-Pb-Ag-Te-Bi-минерализация, возраст минерализации, North Kazakhstan gold ore province, Raigorodok gold deposit, vein-disseminated gold ores, Au-Cu-Pb-Ag-Te-Bi mineralization, age of mineralization
Abstract
The Raigorodok stockwork gold-sulfide-quartz deposit is located in the contact zone of a monzogabbro-diorite massif belonging to the Stepnyak complex (442 Ma). Two main ore formation stages have been established: early, with disseminated gold-bearing pyrite-chalcopyrite mineralization related to skarn, propylite, and K-feldspar formation, and late, with productive mineralization. The late stage was accompanied by the formation of beresite, sericite, and quartz and comprised two substages: (1) quartz-gold-pyrite-chalcopyrite mineralization and (2) quartz-carbonate-gold-polysulfide mineralization. The 40Ar/39Ar ages of beresites and sericites are 422.9 ± 4.3 Ma and 416.7 ± 4.3 Ma, respectively, which is 19-22 Myr younger than the age of the host intrusive massif. The deposit ores formed stepwise, at temperatures of 112-335 ºC and fluid salinity of 0.7-21.2 wt.% NaCl equiv. Sulfur for skarns, propylites, beresites, and ores might have been provided by a deep magma chamber, and the carbonaceous shales of the Vendian Sharyk Formation might have been the source of gold. The isotope and geochemical data and the results of fluid inclusion study suggest that Raigorodok is an intrusion-related deposit. At the same time, the deposit has a number of signs of porphyry-epithermal ore-magmatic systems.
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