Acta Musei Moraviae

Mineral assemblages involving vesuvianite from carbonate and calc-silicate rocks in Moravia and Silesia

Mineral assemblages and chemical composition of vesuvianite were studied at localities in Moravia and Silesia, Czech Republic. Five distinct rock types were distinguished: (i) reaction zones on the contact of marble and metamorphic rock with contrasting chemical composition; (ii) carbonate and carbonate-silicate rocks along regional faults; (iii) direct intrusive contacts between marble and aplite or pegmatite; (iv) quartz veins and contacts with pegmatite in Fe-skarn; (v) various silicate or carbonate-silicate rocks in contact envelope of large granitoid plutons. Vesuvianite-bearing mineral assemblages commonly include grossular, quartz and calcite, wollastonite and diopside are mostly present. Chemical compositions of vesuvianite, particularly Fe/Mg ratio and Ti contents, vary relative to the individual paragenetic types. Mineral assemblages involving vesuvianite are a typical indicator of high activity of H₂O in metamorphic fluids up to X_co2 < 0.03 in the equilibrium assemblage Ves + Woll.