Mineral composition of ore clasts of the Novy Shemur massive sulfide deposit, North Urals
N.P. Safina, N.R. Ayupova, A.S. Tseluyko, K.A. Filippova
The features of mineral composition are considered for clastic ores composing the main part of rich Cu-Zn ores of the Novy Shemur massive sulfde deposit, North Urals. Most abundant ore types include sulfde breccias, which are composed of pyrite and sphalerite clasts in chalcopyrite-sphalerite-pyrite matrix, and sulfde turbidites with rhythmic alternation of sphalerite and pyrite layers. The amount of newly formed pyrite, sphalerite and magnetite increases and the amount of clasts of primary ores decreases in a range from breccias to sandstones. In the same direction, the Zn, Cd, Ag, Pb and Ga contents increase, while the Cu, Au, As, Co, and Mn contents decrease. Index accessory minerals of sulfde breccias are electrum, utenbogaardite, tennantite (up to 3.52 wt. % Ag), Ag- and Se-galena (up to 1.7 wt. % Se) and enargite. The sulfde turbidites contain Ag-rich galena, magnetite, arsenopyrite, tetrahedrite, and cassiterite included in newly formed sulfdes. The matrix of clastic ores is characterized by the presence of Ga-bearing chlorite, mica, epidote and albite (Ga2O3 from 1.24 to 4.88 wt. %). Our data refect the peculiarities of mineral composition of rich Cu-Zn ores of the deposit and explain their high and higher contents of elements.
Figures 7. Tables 4. References 19.
Key words: North Urals, Novy Shemur deposit, copper-zinc ores, ore clasts, minerals, elements.
МINERALOGY № 4 2018