caa a22 4500 467890285 CHVBK 20180406152747.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s00710-006-0129-5 doi (NATIONALLICENCE)springer-10.1007/s00710-006-0129-5 Vikentyev I. V. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, Russia aut Precious metal and telluride mineralogy of large volcanic-hosted massive sulfide deposits in the Urals [Elektronische Daten] [I. V. Vikentyev] Summary: The study focuses on the mode of occurrence of Au, Ag and Te in ores of the Gaisk, Safyanovsk, Uzelginsk and other volcanic-hosted massive sulfide (VHMS) deposits in the Russian Urals. Minerals containing these elements routinely form fine inclusions within common sulfides (pyrite, chalcopyrite and sphalerite). Gold is mostly concentrated as ‘invisible' gold within pyrite and chalcopyrite at concentrations of 1-20 ppm. Silver mainly occurs substituted in tennantite (0.1-6 wt.% Ag). In the early stages of mineralization, gold is concentrated into solid solution within the sulfides and does not form discrete minerals. Mineral parageneses identified in the VHMS deposits that contain discrete gold- and gold-bearing minerals, including native gold, other native elements, various tellurides and tennantite, were formed only in the latest stages of mineralization. Secondary hydrothermal stages and local metamorphism of sulfide ores resulted in redistribution of base and precious metals, refining of the common sulfides, the appearance of submicroscopic and microscopic inclusions of Au-Ag alloys (fineness 0.440-0.975) and segregation of trace elements into new, discrete minerals. The latter include Au and Ag compounds combined with Te, Se, Bi and S. Numerous tellurides (altaite, hessite, stützite, petzite, krennerite etc.) are found in the massive sulfide ores of the Urals and appear to be major carriers of gold and PGE in VHMS ores. Springer-Verlag, 2006 Mineralogy and Petrology Springer-Verlag 87/3-4(2006-07-01), 305-326 0930-0708 87:3-4<305 2006 87 710 https://doi.org/10.1007/s00710-006-0129-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-006-0129-5 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Vikentyev I. V. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, Russia aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer-Verlag 87/3-4(2006-07-01), 305-326 0930-0708 87:3-4<305 2006 87 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer