Βιοστρωματογραφία ναννοαπολοθωμάτων των παλαιογενών μολασσικών αποθέσεων της δυτικής λεκάνης της Θράκης = Nannofossil biostratigraphy of the Paleogene molassic deposits of Western Thrace Basin.

Ιωάννης Στυλιανός Μιχαηλίδης


Η λεκάνη της Θράκης αποτελεί μία από τις μεγαλύτερες και σημαντικότερες λεκάνες στην ευρύτερη περιοχή του Βόρειου Αιγαίου. Το ανατολικό μέρος της λεκάνης αυτής εκτείνεται στην ΒΔ Τουρκία και έχει μελετηθεί εκτενώς λόγω της μεγάλης πιθανότητας υδρογονανθράκων. Η Δυτική λεκάνη της Θράκης τοποθετείται στην ΒΑ Ελλάδα και είναι η περιοχή μελέτης της παρούσας εργασίας. Ανήκει στην μολασσική λεκάνη της Ροδόπης - Βορείου Αιγαίου και χαρακτηρίζεται από Παλαιογενείς μολασσικές αποθέσεις που περικλείονται στο ΒΔ τμήμα από τα μεταμορφωμένα πετρώματα της μάζας της Ροδόπης. Οι Παπανικολάου & Τριανταφύλλου (2010) αναγνώρισαν δύο ρηγματογενείς ζώνες (ΡΖ), την ΡΖ του Αρδά και την ΡΖ του Σουφλίου, οι οποίες διαιρούν την Δυτική λεκάνη της Θράκης σε τρείς επιμέρους υπολεκάνες (ΥΛ), την ΥΛ των Πετρωτών στον Βορρά, την ΥΛ της Αλεξανδρούπολης στο Νότο και την ΥΛ της Ορεστιάδας ενδιάμεσα των άλλων δύο. Στην ΥΛ της Αλεξανδρούπολης παρατηρείται η πιο πλήρης ακολουθία των μολασσικών σχηματισμών. Στα πλαίσια αυτής της έρευνας πραγματοποιήθηκε δειγματοληψία των σχηματισμών της ΥΛ της Αλεξανδρούπολης κατά την οποία συλλέχθηκαν 44 δείγματα από φυσικές και τεχνητές τομές. Από αυτά τα δείγματα κατασκευάστηκαν 51 αντικειμενοφόρες πλάκες οι οποίες μελετήθηκαν για το περιεχόμενο τους σε ασβεστολιθικά ναννοαπολιθώματα με ημι-ποσοτική ανάλυση κάτω από πολωτικό μικροσκόπιο. Από τα 44 δείγματα, 11 περιείχαν ναννοαπολιθώματα, τα οποία αναγνωρίστηκαν και προσδιορίστηκε το ποσοστό συμμετοχής του κάθε είδους στα δείγματα. Παρά το χαμηλό ποσοστό διατήρησης και περιεκτικότητας ναννοαπολιθωμάτων, επιτεύχθηκε ο βιοστρωματογραφικός χαρακτηρισμός των δειγμάτων με την παρουσία χαρακτηριστικών ειδών, όπως Isthmolithus recurvus, Sphenolithus predistentus, S. distentus, S. ciperoensis κ.α. Με αυτόν τον τρόπο τα περισσότερα δείγματα που μελετήθηκαν κατατάχτηκαν σε μία συγκεκριμένη βιοζώνη  με βάση τις βιοζωνώσεις που προτάθηκαν από Martini (1971) και Agnini et al. (2014) προσδιορίζοντας, τελικά, μια πιο λεπτομερή χρονολόγηση των μολασσικών ιζημάτων που συντελούν την Δυτική λεκάνη της Θράκης.

The Thrace basin is one of the largest and most important basins in the North Aegean region. The eastern part of this basin extends to NW Turkey and has been extensively studied due to its high hydrocarbon potential. The western basin of Thrace is located in NE Greece and is the study area of the present work. It belongs to the Rhodope – North Aegean molassic basin and is characterized by Paleogene molassic deposits that are marginalized in the NW part by the metamorphic rocks of the Rhodope massif. Papanikolaou & Triantafyllou (2010) identified two fault zones (FZ), the Ardas FZ and Soufli FZ, which divide the Western Thrace basin into three sub-basins (SB), Petrota SB in the North, the Alexandroupolis SB in the South and the Orestias SB between the other two. The most complete sequence of the molassic formations is observed in the Alexandroupolis SB. As part of this research, sampling of the formations of the Alexandroupolis SB was carried out, during which, 44 samples were collected from natural and artificial outcrops. From these samples, 51 smear slides were created and studied for their content in calcareous nannofossils, using a semi-quantitative analysis under polarizing light microscope. Out of the 44 samples, 11 contained nannofossils. These were identified and the percentage of participation of each species in the samples was determined. Despite the low preservation and content of nannofossils, with the presence of index species, such as Isthmolithus recurvus, Sphenolithus predistentus, S. distentus, S. ciperoensis, etc., it was possible to achieve the biostratigraphical characterization of the samples. In this way, most of the samples studied were classified in a specific biozone based on the biozonations proposed by Martini (1971) and Agnini et al. (2014) defining, finally, a more detailed dating of the molassic sediments that comprise the Western Thrace basin.

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