Duration of Variscan granitic magmatism inferred from Re–Os dating of molybdenite in the Tatric Unit of the Western Carpathians

In the Tatric Unit (Western Carpathians, Slovakia), high-temperature molybdenite mineralisation was formed contemporaneously with Variscan granitic rocks hosting economically important Au-Sb mineralisation.In this work, four molybdenite separates were taken from representative samples of mineralised granite at the Pezinok -Trojrov and Dbrava deposits.Re-Os ages of 368.6 1.4 and 356.7 2.6 Ma (Trojrov) together with Re-Os ages of 349.2 1.3 and 348.3 1.3 Ma (Dbrava) suggest a long-lived mineralisation processes.Our Re-Os molybdenite ages are in agreement with recently published U-Th-Pb single-grains zircon and/or electron-microprobe monazite magmatic ages from hosting granite intrusions.These Re-Os ages mirror the principal periods of granite-forming processes connected with Variscan subduction-collision in the Tatric Unit of the Western Carpathians, that are: subduction stage (369-360 Ma), collision peak (357-349 Ma), and post-collisional extension (345-332 Ma).