Millimetre scale drilling of paragenetically-specific sulphide occurrences represented by ten Myszków molybdenite samples provides a temporal framework for this Mo-W deposit, associated with the transcontinental Hamburg-Kraków tectonic zone. With replicates (second mineral separates) for two samples, a total of twelve Re-Os model ages pin high temperature molybdenite-scheelite-(chalcopyrite) mineralization to a narrow time window, from 300±1 to 296±1 Ma (2-sigma). Published
Ar ages (305-290 Ma) for potassium feldspar, white mica, and biotite do not precisely pin the timing of mineralization, but provide information on the regional cooling history. Alteration is characterized by local metasomatism of hosting Vendian to Cambrian metamorphic rocks, and spatial patterns for Mo-W-(Cu) mineralization support a relationship between metasomatism and mineralization. Dehydration melting of middle crust was followed by local intrusion of magmass along structurally vulnerable zones. Melting of hosting metaclastic sequences influenced local metallic assemblages and provided the magmatic apophyses and crustal enclaves associated with much of the Myszków mineralization. Even though local stockwork may be found, the overall architecture of the Myszków deposit does not support a calc-alkaline porphyry-style deposit, and this interpretation should be reconsidered. We attribute Myszków mineralization to unroofing of the Variscan orogen, rapid late Variscan uplift, and exhumation melting.