Acta Musei Moraviae

Three genetically different types of garnet-rich rocks from Hlinsko Zone and from Polička Crystalline Complex

The garnet-rich rocks are spatially associated with two metamorphosed volcano-sedimetary complexes at the eastern border of the Bohemian Massiv (Polička Crystalline Complex and Hlinsko Zone). The studied rocks represent three genetic types, which are produced by different metamorphic reactions and from chemically different protolites. Garnet-rich rocks from Hlinsko Zone are interpreted as Fe or Fe–Mn rich sediments metamorphosed under medium temperature (about 400–500 °C) and low pressure (below 4 kbar). On the other hand rock from Polička Crystalline Complex represent Fe rich metamorphic rocks (PT condition about 600 °C and 6 kbar) partially modified by metasomatism.