ABSTRACT
Rude, Samoborska gora ore deposit is a subterrestrial, hydrothermal siderite-hematite-polysulfide-barite mineralization, with well developed SEDEX part of the deposit. It is Permo-Triassic in age, situated in the westernmost part of the Zagorje-Mid-Transdanubian zone (ZMT), at the margins of the Dinaridic carbonate platform. The deposits of similar genetic style, like Rude-Samobor, Bistra-Medvednica, Rudabanya (Hungary), accommodate along the Zagorje-Mid-Transdanubian zone (ZMT), a northwestern extension of the Internal Dinarides. The zone stretches SW-NE, and terminates within Gemerides with Rudnyani, Roznava, and other siderite-polysultlde-barite deposits in Slovakia.
Fluid inclusion PVTX characteristics, Pb-isotope and sulfur isotope data provide sufficient information which reveals their geotectonic and genetic heritage. Uniformity of δ34S values of vein barite, around 10 ‰, suggests the engagement of Permian seawater in the hydrothermal ore-forming processes. Molar ratios of Na/Br and Cl/Br, following the evaporation trend, confirm the propossed model of the engagement of Permian seawater, modified by evaporation and fractionation of halite, in the ore-forming process. The results may be applied in other siderite-hematite-polysulfide deposits within the Dinarides, Gemerides and possibly Eastern Alps.
