International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

MIDDLE-LATE TRIASSIC 40Ar/39Ar HORNBLENDE AGES FOR EARLY INTRUSIONS WITHIN THE DITRAU ALKALINE MASSIF, RUMANIA: IMPLICATIONS FOR ALPINE RIFTING IN THE CARPATHIAN OROGEN

Pages: 347 - 352

Authors: DAVID R. DALLMEYER, HANS-GEORG KRAUTNER, FRANZ NEUBAUER

Abstract: 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.

Keywords: Eastern Carpathians, Triassic, alkaline magmatism, rifting

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