Petrochronological study of chloritoid schist from the Medvednica Mts. (Croatia, Zagorje Mid-Transdanubian zone)

A chloritoid schist from the Medvednica Mts. (Croatia, Zagorje-Mid-Transdanubian zone) is part of metasedimentary succession a Palaeozoic-Mesozoic Metamorphic Complex. The studied samples show mineral association chloritoid, chlorite, quartz and white mica. P-T pseudosection, combined with modal chemical isopleths, classical thermobarometric calculations yield peak metamorphic conditions 0.8 – 1.0 GPa at around 500 °C. Monazite in-situ dating electron microprobe results in an age 156 ± 3 (2σ) Ma interpreted as monazite growth during prograde metamorphism. Laser ablation multicollector ICP mass spectrometry U-Th-Pb isotope systematics detrital zircon grains indicate maximal deposition time sedimentary protolith Permian accordance published palaeontological records. presented are synchronous Late Jurassic obduction Neotethys-derived ophiolitic mélange onto Permotriassic sequence originated continental margin Adria. This caused regional collision metamorphism by thrusting Ophiolitic units (i.e. Neotethys) upon tectonic Studied Adria metamorphosed collisional event upper greenschist-facies.