40Ar/39Ar isotopic evidence for mid-Devonian post-metamorphic pegmatite emplacement in the Mariánské Lázně Complex, Bohemian massif, Central European Hercynides

Abstrakt

Cross -Ferroan pargasite in narrow pegmatite vein that cross-cut amhibolite in the Mariánské Lázně complex yield Ar-Ar ages 388 and 379 Ma - time of cooling through 550 - 500 o C soon after emplacement and crystallization.

Klíčová slova

• Český masív
• geochronologie
• mariánsko - lázeňský komplex
• Ar - Ar metoda