ARYSKAN GOLD-SULPHIDE-QUARTZ ORE OCCURRENCE (WESTERN TUVA): CONDITIONS OF FORMATION AND GEOCHEMICAL PECULIARITIES OF FLUIDS

Autor: Renat V. Kuzhuget, Natalia N. Ankusheva, Anna A. Redina, Ilya R. Prokopyev, Ertine Dash V. Ondar
Jazyk: ruština
Rok vydání: 2020
Předmět:
Zdroj: Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 331, Iss 7, Pp 224-237 (2020)
Druh dokumentu: article
ISSN: 24131830
2500-1019
2413-1830
DOI: 10.18799/24131830/2020/7/2732
Popis: The relevance of the research 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 used 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. % NaСl equiv. and temperatures from 250 to 340 °C. The Au-bearing mineral associations were formed at P ~1,8 kbar (~5,4 km depth) in mesoabissal environment due to CO2 watered fluids contained NaCl-KCl-H2O, NaCl-Na2НCO4-H2O и NaCl-H2O with salinity from 2,9 up to 32,9 wt. % NaСl equiv. in front of the temperatures ranged between 290–145 °C (I Au-bearing substage – 290–145 °С, II Au-bearing substage – 270–160 °С) with varying f O2, f S2, f Se2 и f Te2. The isotopic δ34SH2S (from -0,5 up to +1,1 ‰) and salt composition of fluid and trace elements indicate its magmatic genesis.
Databáze: Directory of Open Access Journals
Externí odkaz: