Инд. авторы:	Gibsher N.A., Tomilenko A.A., Sazonov A.M., Ryabukha M.A., Timkina A.L.
Заглавие:	The Gerfed gold deposit: Fluids and PT-conditions for quartz vein formation (Yenisei Ridge, Russia)
Библ. ссылка:	Gibsher N.A., Tomilenko A.A., Sazonov A.M., Ryabukha M.A., Timkina A.L. The Gerfed gold deposit: Fluids and PT-conditions for quartz vein formation (Yenisei Ridge, Russia) // Russian Geology and Geophysics. - 2011. - Vol.52. - Iss. 11. - P.1461-1473. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2011.10.014; SCOPUS: 2-s2.0-80455178895;
Реферат:	eng: At the Gerfed gold deposit, fluid inclusions were studied by thermobarometry, gas chromatography, Raman spectroscopy, and ICP MS in quartz samples of three types: quartzites, Au-poor (<1-2 ppm) feathering veins, and Au-rich (>2.8-10 ppm) feathering veins. It has been found that these three types were produced from fluids differing in composition and thermobarogeochemical parameters. The quartzites formed from low-salinity (<7.0 wt.% NaCl equiv) homogeneous fluids of essentially aqueous-chloride composition at 120-230 °C and 0.1-0.5 kbar. The gas phase in these fluids comprises H2O, CO2, CH4, and N2, with CO2/(CO2 + H2O) = 0.04-0.15 and CO2/CH4 = 2.2-3.8. The Au-poor feathering veins formed from homogeneous and heterogeneous fluids at 150-300 °C and 0.5-2.0 kbar. The salinity of the fluids increased to 10 wt.% NaCl equiv. The gas phase in them comprises H2O, CO2, N2, and CH4. Here, CO2/(CO2 + H2O) = 0.09-0.17 and CO2/CH4 = 2.2-2.3. The Au-rich feathering veins formed from heterogeneous and more saline (6.0-23.3 wt.% NaCl equiv) CO2-H2O fluids at higher temperatures (150-400 °C) and pressures (1.1-2.5 kbar). In this fluid CO2/(CO2 + H2O) = 0.18-0.27 and CO2/CH4 = 4.1-20.8. All three quartz types show negative Eu anomalies and a distinct predominance of LREE over HREE. Differently directed trends of REE and Eu/Sm in the quartzites and feathering veins suggest that the fluids were produced from different sources. The fluids of the gold-bearing quartz veins are enriched in K, Li, and Rb, and those of the Au-poor feathering veins, in Sr and Na. The quartzites have low Rb and Sr and similar Na and K contents. Areas with a high and bonanza gold content in feathering-vein stockworks formed when high-temperature saline H2O-CO2 fluids were superposed on the Au-poor quartzites and feathering veins. © 2011.
Ключевые слова:	Yenisei Ridge; Russian Federation; Krasnoyarsk [Russian Federation]; rare earth element; Raman spectroscopy; quartz vein; P-T conditions; ore deposit; inductively coupled plasma method; high temperature; gold; gas chromatography; fluid inclusion; chemical composition; Rare-earth elements; Quartz; Gold; Fluid inclusions;
Издано:	2011
Физ. характеристика:	с.1461-1473