Bulletin Mineralogie Petrologie

Buriánek David, Mlčoch Bedřich

Ročník 22, číslo 2 (2014), strana 346-355

Calc-silicate rock, amphibolite, gneiss, PT-conditions, Mariánské Lázně Metaophiolite Complex, Teplá Crystalline Unit, Czech Republic

The northern part of the Mariánské Lázně Metaophiolite Complex, consist of inhomogeneous amphibolites (sometimes with a garnet), locally with small layers of calc-silicate rocks. Mineral assemblage of calc-silicate rocks is relatively simple and includes garnet, clinopyroxene and plagioclase. Chemical composition of garnet from surrounding amphibolites (Alm_45-54 Grs_33-35 Prp_8-14 Sps_2-4 Adr_0-4) differs from the chemical composition of garnets from calc-silicate rocks (Grs_84-88 Adr_11-15 Sps₁). Microstructural relations indicate clinozoisite-consuming reaction for formation of garnets in calc-silicate rocks. Mineral assemblage preserved as inclusions in garnet in amphibolites indicate PT conditions for the formation of garnet are ~ 660 °C and 10 kbar. The main metamorphic event in the adjacent Teplá Crystalline Complex, indicates significantly lower temperature and pressure setting (~ 600 °C and 7 kbar).

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