PETROLOGICAL, MINERALOGICAL AND GEOCHEMICAL DATA FROM THE EOHELLENIC OPHIOLITIC NAPPE IN THE ISLAND OF SKYROS, GREECE


Δημοσιευμένα: Ιουλ 28, 2016
Λέξεις-κλειδιά:
Μετασωμάτωση μεταμόρφωση βεζουβιανίτης ροδιγκίτης υποβύθιση
C. Karkalis
A. Magganas
P. Koutsovitis
Περίληψη
Οι οφιόλιθοι της νήσου Σκύρου αποτελούνται κυρίως από σερπεντινιωμένους χατρζβουργίτες, γαββρικά πετρώματα, δολερίτες, θολεϊιτικές βασαλτικές λάβες, ροδιγκίτες και οφειτασβεστίτες. Αυτή η οφιολιθική ακολουθία περιλαμβάνει ένα οφιολιθικό mélange προ-Ανωκρητιδικής ηλικίας το οποίο ανήκει στο Ηωελληνικό Κάλυμμα που έχει υποστεί χαμηλού έως μέσου βαθμού μεταμορφικές και μετασωματικές διεργασίες. Τα ορυκτοχημικά και γεωχημικά δεδομένα καταδεικνύουν τη σχέση αυτών των πετρωμάτων με ένα περιβάλλον διάνοιξης υπεράνω ζώνης υποβύθισης (SSZ). Η παρουσία βεζουβιανίτη στους ροδιγκίτες καθώς και η ύπαρξη υπολειματικών σπινέλιων στους σερπεντινίτες, επιβεβαιώνουν περεταίρω την εν λόγω υπόθεση. Η σύγκριση γεωχημικών και πετρολογικών στοιχείων των οφιολιθικών πετρωμάτων τηςΣκύρου, με ανάλογα πετρώματα από την Ανατολική Θεσσαλία και από άλλα νησιά των Βορείων Σποράδων δείχνει ότι υπάρχουν κοινά πετρογενετικά χαρακτηριστικά. Αυτά τα Ηωελληνικά οφιολιθικά πετρώματα της Κεντρικής Ελλάδας μαζί με ανάλογης σύστασης, προέλευσης και εξέλιξης οφιλίθους της ανώτερης τεκτονικής ενότητας της Αττικο-Κυκλαδικής Ζώνης πιθανά αποτελούν μια ενιαία 1868 επιμηκυμένη ζώνη σχετιζόμενο με το υπερκείµενο τέμαχος του Συστήματος Αποκόλλησης των Βορείων Κυκλάδων.
Λεπτομέρειες άρθρου
  • Ενότητα
  • Πετρολογία και Ορυκτολογία
Λήψεις
Τα δεδομένα λήψης δεν είναι ακόμη διαθέσιμα.
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