Primary Minerals and Age of The Hydrothermal Quartz Veins Containing U-Mo-(Pb, Bi, Te) Mineralization in the Majerská Valley near Čučma (Gemeric Unit, Spišsko-Gemerské Rudohorie Mts., Slovak Republic)

Štefan Ferenc,Martin Števko,Eva Hoppanová,Stanislava Milovská,Richard Kopáčik,Tomáš Mikuš

doi:10.3390/min11060629

Štefan Ferenc, Martin Števko + Show 4 more

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https://doi.org/10.3390/min11060629

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Abstract

An occurrence of vein U-Mo mineralization is located in the Majerská valley near Čučma, about 7 km to the NNE of the district town of Rožňava (Eastern Slovakia). Mineralization is hosted in the acidic metapyroclastics of the Silurian Bystrý Potok Fm. (Gemeric Unit), and originated in the following stages: (I.) quartz I, fluorapatite I; (II.) quartz II, fluorapatite II, zircon, rutile chlorite, tourmaline; (III.) uraninite, molybdenite, U-Ti oxides; (IV.) pyrite I, ullmannite, gersdorffite, cobaltite; (Va.) galena, bismuth, tetradymite, joséite A and B, Bi3(TeS)2 mineral phase, (BiPb)(TeS) mineral phase, ikunolite; (Vb.) minerals of the kobellite–tintinaite series, cosalite; (VI.) pyrite II; (VII.) titanite, chlorite; and (VIII.) supergene mineral phases. The chemical in-situ electron-microprobe U-Pb dating of uraninite from a studied vein yielded an average age of around 265 Ma, corresponding to the Guadalupian Epoch of Permian; the obtained data corresponds with the age of Gemeric S-type granites. The age correlation of uraninite with the Gemeric S-type granites and the spatial connection of the studied mineralization with the Čučma granite allows us to assume that it is a Hercynian, granite-related (perigranitic) mineralization.

Highlights

Radioactive anomalies in the vicinity of the Cucma village, north of the district townRožnava (Eastern Slovakia), were, in the past, a subject of several repeated geological surveys or mineralogical-geochemical research [1,2,3,4,5,6,7,8,9,10,11,12,13]
Accessory minerals are represented by fluorapatite, zircon, titanite, muscovite, chlorites, tourmaline, rutile, leucoxenized Fe-Ti oxides and, rarely, U-Ti oxides
U-Mo mineralization is often accompanied by younger, sulphidic mineralization

Summary

Introduction

Rožnava (Eastern Slovakia), were, in the past, a subject of several repeated geological surveys or mineralogical-geochemical research [1,2,3,4,5,6,7,8,9,10,11,12,13]. These works were focused on the prospecting, possible verification of raw materials resources and more detailed genetic or mineralogical-geochemical study of U, REE and Au ores. In the area of the Majerská valley near Cucma, the following two types of these veins can be distinguished, based on their mineral composition:

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