Chromium- and nickel-rich micas and associated minerals in listvenite from the Muranska Zdychava, Slovakia: products of hydrothermal metasomatic transformation of ultrabasic rock

Ferenc, Štefan, 1977- Chromium- and nickel-rich micas and associated minerals in listvenite from the Muranska Zdychava, Slovakia: products of hydrothermal metasomatic transformation of ultrabasic rock / Štefan Ferenc ... [et al.]. -- The Cr-Ni-rich micas, Ni-Co sulphide phases and associated minerals occur in a small body of listvenite, an extensively altered serpentinite, in Lower Palaeozoic paragneisses near Murnska Zdychava village in Slovensk Rudohorie Mts. (Veporic Superunit, central Slovakia). The main rock-forming minerals of the listvenite are magnesite, dolomite and a serpentine-group mineral, less frequently calcite, quartz and talc. Accessory minerals of the listvenite include Cr-Ni-rich micas, chromite, and Ni-Co-Fe-(Cu-Pb) sulphide minerals (pyrite, pyrrhotite, pentlandite, millerite, polydymite, violarite, siegenite, gersdorffite, cobaltite, chalcopyrite and galena). The micas from the Muranska Zdychava listvenite (Cr-Ni-rich illite to muscovite and Ni-dominant trioctahedral mica) contain the highest Ni concentrations ever reported in the mica-group minerals (up to 22.8 wt. % NiO or 1.46 apfu Ni). The Cr concentrations are also relatively high (up to 11.0 wt. % Cr2O3 or 0.64 apfu). Compositional variations in both Cr-Ni-rich mica minerals are characterized by the negative Cr vs. Ni correlation that indicates a dominant role of 2(O)M(3)+ + (O) = 3(O)M(2)+ and M-O(3)+ + Al-T = M-O(2)+ + Si-T substitution mechanisms. Chromite is dominated by Fe2+ (0.82-0.90 apfu) and Cr (1.38-1.79 apfu).

In Journal of Geosciences. -- Prague : Czech Geological Society, 2016. -- ISSN 1802-6222. -- ISSN 1803-1943. -- Vol. 61, no. 3 (2016), pp. 239-254

1. mineralizácia 2. sulfidické minerály 3. sulfidická mineralizácia 4. Západné Karpaty (pohorie) 5. Muránska Zdychava (Slovensko)

I. Uher, Pavel
II. Spišiak, Ján, 1953-
III. Šimonová, Viera, 1977-
IV. Journal of Geosciences. -- Vol. 61, no. 3 (2016), pp. 239-254

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