There are numerous calcite veins with quartz and little sulphides that cut through the Devonian limestones near Hranice. They are assumed to be a post-Variscan mineralization stage. Low temperature fluids (50 to 100°C), from which hydrothermal minerals precipitated, can be best interpreted as mainly basinal fluids (type H2O-NaCl-CaCl2). The fluid system has been influenced by meteoric and marine water (d18O of fluids between -7 and 0 ‰ SMOW). Highly variable precipitation conditions are indicated by zonal structures of most mineral phases. Such conditions are comparable with other vein type mineralizations in the Moravo-Silesian Paleozoic
