Fahlores of ore facies of the Yubileynoe massive sulfide deposit (South Urals)
A.S. Tseluyko, N.R. Ayupova, S.P. Maslennikova, V.A. Kotlyarov
UDК 535.435
The Ag-, Te-, Mn, Pb-bearing tennantite and minerals of the tennantite-tetrahedrite series are recognized in chalcopyrite-pyrite-sphalerite-talc-calcite smoker chimneys, bornite- and chalcopy-rite-rich and quartz-carbonate-hematite diagenites and siliceous siltstones. Tennantite is а dominant mineral in chalcopyrite crustifcation of chimneys, while tennantite and tennatite-tetrahedrite are abundant in colloform pyrite replaced by chalcopyrite and in axial conduits flled with sphalerite, talc and calcite. The #Sb value (100Sb/(Sb + As + Te)) (1.4 → 48.5 %) increases and the average contents of Fe (3.8 → 2.1 wt. %), Cu (42.2 → 39.8 wt. %) and As (19.6 → 9.7 wt. %) decrease from central to marginal parts of fahlore grains. It is suggested that the increase in #Sb value is related to the increasing role of seawater in hydrothermal fuids. The average #Fe value (100Fe/(Fe + Zn)) of tennantite decreases in a range from chimneys (42 %) and pyrite-chalcopyrite layers (37 %) to bornite-bearing diagenites (8.5 %). In terms of Fe, Zn and Sb contents, most of the analysis fall between compositions of fahlores of Cyprus and Uralian types of VMS deposit except of tennantite of bornite-diagenites ores, the composition of which corresponds to that of Kuroko type deposits.
Figures 7. Tables 2. References 32.
Key words: fahlore, ore-bearing facies, sulfde chimneys of paleosmokers, volcanic massive sulfde deposits, Urals.
A.S. Tseluyko, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia; celyukoa@rambler.ru; South Urals State University, Miass branch, ul. 8 Iyulya 10, Miass, Chelyabinsk district, 456301 Russia;
N.R. Ayupova, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia; South Urals State University, Miass branch, ul. 8 Iyulya 10, Miass, Chelyabinsk district, 456301 Russia;
S.P. Maslennikova, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia;
V.A. Kotlyarov, Institute of Mineralogy UB RAS, Miass, Chelyabinsk district, 456317 Russia
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МINERALOGY № 4 2018