THE EMPLACEMENT OF THE VERMION NAPPE IN THE AREA OF KATO SELI (MT VERMION, CENTRAL MACEDONIA, GREECE)

H υπαίθρια εργασία μας στην περιοχή του Κάτω Σελίου στο όρος Βέρμιο, δείχνει ότι το Τεκτονικό Κάλυμμα του Βερμίου δεν υπέρκειται τεκτονικά μόνο του Μαιστρίχτιου φλύσχη της Πελαγονικής Ζώνης, αλλά και ενός Ιουρασικού melange που υπέρκειται τεκτονικά των Τριαδικών-Ιουρασικών μαρμάρων της Πελαγονικής Ζώνης. Επιπλέον, ανάμεσα στο Tεκτονικό Κάλυμμα του Βερμίου και του υποκείμενου melange, τεκτονικοί φακοί μετα-ψαμμιτών–μετα-ρουδιτών έχουν τεκτονικά τοποθετηθεί. Αυτό απαιτεί μια αναθεώρηση της τοποθέτησης του Τεκτονικού Καλύμματος του Βερμίου και του ρόλου του στη γεωτεκτονική εξέλιξη της περιοχής.Our fieldwork in the area of Kato Seli of Mt Vermion suggests that the Vermion Nappe is not only tectonically overlying the Maastrichtian flysch of the Pelagonian Zone, but also a Jurassic melange that overlies the Triassic-Jurassic marbles of the Pelagonian Zone. Moreover, between the Vermion Nappe and the underlying melange, tectonic slivers of meta-sandstones-meta-rudites are tectonically emplaced. This calls for a reassessment of the emplacement of the Vermion Nappe and its role in the geotectonic evolution of the area

FAULTING DEFORMATION OF THE MESOHELLENIC TROUGH IN THE KASTORIA-NESTORION REGION (WESTERN MACEDONIA, GREECE)

The Kastoria-Nestorion region, which belongs to the Tertiary MesoHellenic Trough (MHT), is a low relief NW-SE trending intermountainous basin filled with Tertiary molasse-type sedimentary rocks and nowadays drained by the Aliakmnonas River and its tributaries. In the present work, the large fault zones in the region and the general fault pattern are defined, mapped and described with the aid of satellite images. In addition, a large number of fault-slip data from the mesoscale exposed faults has been recorded, in order to better understand the faulting geometry and kinematics of the region. The stress-inversion analysis of these fault-slip data in comparison with earthquake faultplane solution information permits us to define the stress regimes imposed to the region from the Late Tertiary up to the present and to correlate them with the late orogenic and post-orogenic deformation of the Hellenic orogen. In particular, five stress regimes have been defined from which the former two (D1 and D2) are related to the late collisional processes between the Apulia and Eurasia plates, the next two events (D3 and D4) are related to the present-day Hellenic subduction zone, whereas the last D5 event which is the active deformation of the region appears as an intra-continental or intra-plate deformation more related with the Adria-Eurasia ongoing convergence rather with the Hellenic subduction zone