Инд. авторы:	Savva N.E., Palyanova G.A., Kolova E.E.
Заглавие:	Gold and silver minerals and condition of their formation at the dorozhnoye deposit (magadan region rossia)
Библ. ссылка:	Savva N.E., Palyanova G.A., Kolova E.E. Gold and silver minerals and condition of their formation at the dorozhnoye deposit (magadan region rossia) // Natural Resources. - 2014. - Vol.5. - Iss. 9. - P.477-495. - ISSN 2158-706X. - EISSN 2158-7086.
Внешние системы:	DOI: 10.4236/nr.2014.59044; РИНЦ: 28815278;
Реферат:	eng: This paper presents the brief geological and mineralogical characteristics of the Dorozhnoye mesothermal gold ore deposit (Magadan Region, Russia). The gold and silver minerals are represented by electrum (530‰ - 700‰), freibergite, stephanite, pyrargyrite and Bi-diaphorite. The homogeneous fluid inclusions enable one to determine that the quartz-molybdenite veins were formed at a temperature of 340°C to 140°C, and that the quartz-sulfide gold ore veins were formed at a temperature of 165°C to 125°C. It is assumed that the fluid had a mixed composition and evolved from K-chloride and K-carbonate to Na-chloride. The hypergenesis zone contains: high fineness gold (800‰ - 950‰), petrovskaite (AgAuS) and uytenbogaardtite (Ag3AuS2) associated with goethite and melanterite. The surface waters contain: Ca++ up to 293 mg/L, HCO3 up to 125 mg/L, SO4 up to 777 mg/L; рН is 5.8 to 7.2. Thermodynamic calculations have been conducted and Eh-pH diagrams have been built for the Au-Ag-S-H2O system at 25°C and 100°C (p = 1 bar) to reveal gold and silver stability fields. Au-Ag sulfides at the Dorozhnoye deposit are formed under oxidizing conditions and an acidic environment with dominating sulfates.
Ключевые слова:	Eh-pH diagrams; genesis; Au-Ag Minerals; Dorozhnoye Deposit;
Издано:	2014
Физ. характеристика:	с.477-495