The Raigorodok stockwork gold–sulfide–quartz deposit in the North Kazakhstan gold ore province
| Autor: | E.A. Naumov, K.R. Kovalev, F.I. Zhimulev, S.O. Syzdykov, V.V. Baranov, Yu. A. Kalinin, A. S. Gladkov, V. P. Sukhorukov |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Mineralization (geology) Stockwork Sulfide 020209 energy Geochemistry chemistry.chemical_element Geology Skarn 02 engineering and technology Magma chamber 010502 geochemistry & geophysics Sericite 01 natural sciences Sulfur Geophysics chemistry 0202 electrical engineering electronic engineering information engineering Quartz 0105 earth and related environmental sciences |
| Zdroj: | Russian Geology and Geophysics. 59:1482-1496 |
| ISSN: | 1068-7971 |
| DOI: | 10.1016/j.rgg.2018.10.008 |
| Popis: | The Raigorodok stockwork gold–sulfide–quartz deposit is located in the contact zone of a monzogabbro–diorite intrusion 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 intrusion. The deposit ores formed stepwise, at temperatures of 112–335 °C 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. |
| Databáze: | OpenAIRE |
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