Sur l'existence et l'age des deux phases regionales de metamorphisme alpin dans les zones internes des Hellenides en Macedoine centrale (Grece)

Abstract

Abstract Two regional phases of alpine metamorphism developed contemporaneously in the inner zones of the Hellenides: the first phase was after the Triassic, probably in the upper Jurassic, and earlier than the upper Maestrichtian or even the Aptian-basal Albian; the second phase was after the upper Maestrichtian but before the lower Oligocene, probably in the Priabonian. In addition, a phase of dynamic metamorphism was manifest locally in the foreland of the Serbo-Macedonian massif, in volcanic and tuffaceous formations of middle-upper Eocene age; it was contemporaneous with the late Priabonian tectonic phase. Hercynian and pre-Hercynian cores are both represented in the inner Hellenides and were affected by the alpine metamorphism.