Dating the onset of Variscan crustal exhumation in the core of the Bohemian Massif: new U-Pb single zircon ages from the high-K calc-alkaline granodiorites of the Blatná suite, Central Bohemian Plutonic Complex

Abstract

New ion microprobe U–Pb zircon ages for the high-K calc-alkaline Blatná suite pinpoint the onset of exhumation of the Moldanubian Unit. Both Blatná and Kozárovice granodiorites (346 ± 2 Ma and 347 ± 2 Ma) were generated by melting of a heterogeneous crust and were emplaced contemporaneously to form the Blatná composite pluton.

Keywords

• Central Bohemian Plutonic Complex
• Exhumation
• Emplacement
• Geochemistry
• Ion microprobe U–Pb dating
• Zircon
• Variscan orogen
• Bohemian Massif