Polymetallic Cu-Bi-(Pb-Zn-Co-Ag) mineralization of the Perin Potok locality near Bor, Serbia

Abstract

Complex polymetallic Cu-Bi-(Pb-Zn-Co-Ag) mineralization of the Perin Potok locality occurs as disseminations and fine nests in quartz-ankerite-(sericite) veins. The veins are located in metamorphic rocks of the outer contact zone of the Variscan Gornjane Granitoid. The mineralization consists of (in decreasing abundance): chalcopyrite, aikinite, bismuth, galena, Ag,Bi-bearing tetrahedrite, sphalerite, cobaltite and an unnamed Bi₂Te mineral. All these phases form distinctive exsolutions and intergrowths and they simultaneously precipitated from a very complex hydrothermal fluid. Silver shows elevated contents in tetrahedrite (3.3-4.4 wt. % Ag), galena (0.9-1.1 wt. % Ag) and in the unnamed Bi₂Te mineral (0.9 wt. % Ag). Such high Ag concentrations can imply that Ag minerals could be also present. Minor amounts of rutile showing fine intergrowths with sericite also occur in this paragenesis. This is W-bearing rutile that shows zoning caused by up to 2.2 wt. % W. The studied mineralization is probably genetically related to the Variscan Gornjane Granitoid, although the possibility of derivation from the metamorphic basement should be also taken into account.