PALEOBATHYMETRIC EVOLUTION OF THE EARLY LATE MIOCENE DEPOSITS OF THE PRE-APULIAN ZONE, LEVKAS ISLAND, IONIAN SEA


Δημοσιευμένα: Jun 8, 2007
Λέξεις-κλειδιά:
βενθονικά τρηματοφόρα παλαιοβαθυμετρία Τορτόνιο Προ-Απούλια ζώνη Μεσόγειος
H. Drinia
A. Antonarakou
G. Kontakiotis
N. Tsaparas
M. Segou
V. Karakitsios
Περίληψη

Η τομή Μανάση, (vr\oos Λευκάδα) ανήκει στην Προ-Απουλία (Παξοί) ζώνη, η οποία αποτελεί το εξωτερικότερο τμήμα των Ελληνίδων. Τα ιζήματα της τομής, ηλικίας Κατώτερο Τορτόνιο, περιέχουν μια πλούσια πανίδα τρηματοφόρων, όπου επικρατούν σε αριθμό ατόμων, τα πλαγκτονικά είδη. Η υψηλής ποικιλότητας συνάθροιση βενθονικών τρηματοφόρων χαρακτηρίζεται από έναν υψηλό αριθμό ειδών, με μικρό αριθμό ατόμων. Η ανάλυση της κατανομής των ειδών των βενθονικών τρηματοφόρων παρέχει στοιχεία για την παλαιοβαθυμετρική εξέλιξη της L·κάvης. Τα ιζήματα της τομής Μανάση αντιπροσωπεύουν απόθεση σε βάθη της ανώτερης έως και κατώτερης βαθύαλης ζώνης, η οποία έλαβε χώρα κατά τη διάρκεια της μετά του Μέσου Μειόκαινου τεκτονικής ανύψωσης της περιοχής. Η κατά μήκος κατωφέρειας μεταφορά της πανίδας εξαιτίας της δραστηριότητας τουρβιδιτικών ρευμάτων επισκιάζει εν μέρει την κατανομή των διαγνωστικών για το παλαιοβάθος βενθονικών ειδών. Η αναγνώριση αλλόχθονων ειδών βενθονικών τρηματοφόρων χρησιμοποιείται, μαζί με την αναλογία των πλαγκτονικών τρηματοφόρων, για να καταδείξει την παρουσία τουρβιδιτικών στρωμάτων μέσα στις μάργες. Η μικροπαλαιοντολογική και παλαιοβαθυμετρική ανάλυση των αποθέσεων της τομής Μανάσση, έδειξε ότι αυτές αντιπροσωπεύουν έναν μακρινό άτυπο φλύσχη που αποτέθηκε στο κέντρο απόθεσης (depocenter) του πλέον εξωτερικού χώρου (Προ-Απούλιας ζώνη) της προχωράς των Ελληνίδων.

Λεπτομέρειες άρθρου
  • Ενότητα
  • Παλαιοντολογία, Στρωματογραφία και Ιζηματολογία
Λήψεις
Τα δεδομένα λήψης δεν είναι ακόμη διαθέσιμα.
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