Bulletin Mineralogie Petrologie

Uher Pavel, Ružička Peter, Bilohuščin Vladimír

Ročník 23, číslo 1 (2015), strana 19-25

chromium-vanadium-rich garnet, grossular, skarn, chemical composition, Dubová, Western Carpathians

Grossular garnet, enriched in Cr and V, forms rare subhedral crystals (up to 40 μm in size) with diopside, albite, K-feldspar, titanite and clinozoisite in Ca-skarn near Dubová, Malé Karpaty Mts., Western Carpathians (SW Slovakia). The skarn is situated along the contact between Devonian limestones and Carboniferous granitic rocks. Grossular crystals shows two distinct zones: Cr-V enriched core and Cr-V poor rim with sharp boundary between the zones. The Cr,V-rich grossular cores contain 0.9 to 5.3 wt.% Cr₂O₃ (0.06 to 0.33 apfu Cr) and 0.5 to 2.0 wt.% V₂O₃ (0.03 to 0.13 apfu V), whereas the rims exhibit £0.5 wt.% Cr₂O₃ (£0.03 apfu Cr) and £0.3 wt.% V₂O₃ (£0.02 apfu V). The garnet cores and rims show (in mol.%): 60-73 and 75-94 grossular, 11-19 and 2-19 andradite, 3-18 and 0-2 uvarovite, 1-7 and 0-1 goldmanite, 1-4 and 0-5 almandine, and 0.5-1.4 and 0.4-1.6 spessartine, respectively. The garnet cores usually corresponds to Cr > Mn > V (apfu) composition, a new type in chemical classification of V,Cr-rich grossular (tsavorite). Adjacent dark, graphite-rich phyllites were probably the source of Cr and V. The Cr,V-rich grossular cores precipitated probably during the early contact-metamorphic stage, whereas the Cr,V-poor rims originated during later, main evolution stage of the skarn formation.

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