ISSN

print 2570-7337
online 2570-7345

Ľubietová-Peklo - small occurrence of Cu-(±Ag) ores hidden in the shadow of „copper giants“ (Slovenské Rudohorie Mts., Veporic Unit, Western Carpathians)


Keywords

Abstract

Ľubietová-Peklo Cu-(±Ag) ore occurrence is located about 20 km to the E from Banská Bystrica (district city) and about 3.7 km to the ENE from Ľubietová village (Central Slovakia). In the past (16th - 19th century), mining works of alesser extent were made on this site. Subvertical quartz-carbonate veins (NE-SW to E-W direction) with ore minerals intersect both, migmatitised orthogneisses (Lower Paleozoic) and Permian greywackes of the Veporic Unit. Ore veins are intersected and displaced by NW-SE directed younger tectonic structures (often with development of quartz veins without ore mineralization). Ore mineralization originated in the following stages: I.) pyrite-arsenopyrite stage (quartz I, pyrite, arsenopyrite, cobaltite I); II.) bournonite stage (bournonite-seligmannite, galena); III) carbonate stage (dolomite-Fe dolomite, barite) and quartz-sulphidic stage (quartz II, cobaltite II, sphalerite, chalcopyrite I and II, tetrahedrite, tennantite). Supergene zone is represented by small amounts of cerussite, malachite and goethite. Mineralogically remarkable are zonal crystals of bournonite-seligmannite (almost complete solid solution). The most extreme difference between As and Sb content in a single crystal can be expressed as Bnn99Slg1 to Slg84Bnn16. The Sb content generally increases from the centre of the crystals toward their rims. On the most deposits, mineral phases of the bournonite-seligmannite series occur as a younger minerals (in association with jordanite, geocronite and galena) and crystallize usually after precipitation of tetrahedrite, tennantite, or chalcopyrite. As for the Ľubietová-Peklo occurrence, mineral phases of bournonite-seligmannite series crystallize directly from As- and Sb-bearing hydrothermal fluids, unusually before crystallization of tetrahedrite, tennantite and chalcopyrite. Hydrothermal vein mineralization has an Alpinian age and originated most probably during Upper Cretaceous.

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