Multigrain hornblende concentrates from two samples of massive gabbro and diorite collected within „early“ intrusive phases of the Ditrau alkaline complex (Rumania) record well-defined ³⁶Ar/⁴⁰Ar vs. ³⁹Ar/⁴⁰Ar plateau isotope correlation ages of 231.5 ± 0.1 Ma and 227.1 ± 0.1 Ma; 2σ intralaboratory error). These are interpreted as dating relatively rapid post-magmatic cooling at high crustal levels following pluton emplacement in the Middle-Late Triassic. The magmatic activity predated Early Jurassic rifting in the Eastern Carpathian orogen.