| Инд. авторы: | Kuzhuget R.V., Ankusheva N.N., Redina A.A., Prokopyev I.R, Ondar E.D.V. |
| Заглавие: | ARYSKAN GOLD-SULPHIDE-QUARTZ ORE OCCURRENCE (WESTERN TUVA): CONDITIONS OF FORMATION AND GEOCHEMICAL PECULIARITIES |
| Библ. ссылка: | Kuzhuget R.V., Ankusheva N.N., Redina A.A., Prokopyev I.R, Ondar E.D.V. ARYSKAN GOLD-SULPHIDE-QUARTZ ORE OCCURRENCE (WESTERN TUVA): CONDITIONS OF FORMATION AND GEOCHEMICAL PECULIARITIES // Известия Томского политехнического университета. Инжиниринг георесурсов. - 2020. - Vol.331. - Iss. 7. - P.224-237. - ISSN 2500-1019. - EISSN 2413-1830. |
| Внешние системы: | DOI: 10.18799/24131830/2020/7/2732; WoS: 000556720500019; |
| Реферат: | eng: The relevance of the research is defined by the need to determine the genesis and formation conditions of gold deposits from Tuva Republic for improving the efficiency of geological prospecting and increasing the gold mineral resource base of the region. The aim of the research is to examine the conditions of fluid formation and geochemical peculiarities of Aryskan gold ore occurrence in Western Tuva. Analytical methods. The temperatures, fluid composition, salinity, and trapping pressures were examined due to fluid inclusion study by means of Linkam TMS-600 cryostage equipped with Olympus BX 51 optical microscope; gas composition of fluid inclusions was detected using Ramanor U-1000 Raman spectrometer equipped with Horiba DU420E-OE-323 detector and Millennia Pro (Spectra-Physics) laser; bulk element composition of fluid was determined on Agilent 6890 gas chromatograph, extracted anion amounts of fluid were detected using TSVET-3000 ion chromatograph, cations and trace elements - by means of ICP MS (Elan-6100); S isotopic compositions were specified on Finnigan MAT Delta gas mass-spectrometer. Results. We specified that early beresites of Aryskan ore occurrence were formed due to CO2 water-chloride fluid with salinity ranged between 4,9 and 41,5 wt. % NaCl equiv. and temperatures from 250 to 340 degrees C. The Au-bearing mineral associations were formed at P similar to 1,8 kbar (similar to 5,4 km depth) in mesoabissal environment due to CO2 watered fluids contained NaCl-KCl-H2O, NaCl-Na2HCO4-H2O and NaCl-H2O with salinity from 2,9 up to 32,9 wt. % NaCl equiv. in front of the temperatures ranged between 290-145 degrees C (I Au-bearing sub-stage - 290-145 degrees C, II Au-bearing substage - 270-160 degrees C) with varying f O-2, f S-2, f Se-2 and f Te-2. The isotopic delta(34)S(H2)s (from -0,5 up to +1,1 parts per thousand) and salt composition of fluids and trace elements indicate the magmatic genesis.
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| Ключевые слова: | sulphur isotopic composition; trace elements; fluid inclusions; Tuva; quartz; gold deposits; beresites; Gold; DEPOSITS; |
| Издано: | 2020 |
| Физ. характеристика: | с.224-237 |