Πετρογραφία και Ορυκτολογία του πλουτωνίτη του Κενταύρου = Petrology and Mineralogy of the Kentavros plutonite.
Περίληψη
H παρούσα εργασία πραγματεύεται την πετρογραφία, τη γεωχημεία και την πετρογένεση του πλουτωνίτη του Κενταύρου, καθώς και τη σύγκρισή του με τον αντίστοιχο της Ξάνθης. Η ηλικία του πλουτωνίτη υπολογίζεται με τη μέθοδο K/Ar σε Hb στα 38 ± 1 Ma. Οι πετρογραφικόι τύποι του πλουτωνίτη είναι οι εξής: Σωρρειτικά πετρώματα (Cum), Γάββροι (Gb), Διορίτες και Χαλαζιακοί μονζοδιορίτες (Dr, Qz-MzDr), Τοναλίτες (Ton) και Πηγματίτες (Pgm). Η μικροσκοπική παρατήρηση έδειξε ότι η ορυκτολογική σύσταση του πλουτωνίτη περιλαμβάνει: χαλαζία, πλαγιόκλαστο, ορθόκλαστο, μικροκλινή, κεροστίλβη, πυρόξενο, βιοτίτη, τιτανίτη, χλωρίτη, αλλανίτη, επίδοτο, ζιρκόνιο, κλινοζοϊσίτη και μεταλλικά ορυκτά. Η γεωχημική ανάλυση έδειξε ότι ο πλουτωνίτης ανήκει στην ασβεσταλκαλική έως την υψηλού Κ ασβεσταλκαλική σειρά και χαρακτηρίζεται ως μεταργιλικός I-τύπου. Το γεωτεκτονικό περιβάλλον με το οποίο συνδέεται είναι ενεργό ηπειρωτικό περιθώριο (VAG). Ο πλουτωνίτης του Κενταύρου συγκρίνεται με τον αντίστοιχο της Ξάνθης, δίοτι παρουσιάζουν ομοιότητες. Τα κοινά τους χαρακτηριστικά είναι η ηλικία, ορισμένοι πετρογραφικοί τύποι, οι τιμές κάποιων χημικών στοιχείων, το γεωτεκτονικό περιβάλλον και ο τύπος μάγματος.
This thesis deals with the petrography, geochemistry and petrogenesis of the Kentavros plutonite, as well as its comparison with Xanthi’s plutonite. The age of the plutonite is estimated by K/Ar method in Hb at 38 ± 1 Ma. The petrographic types of the plutonite are: Cumulate rocks (Cum), Gabbros (Gb), Diorites and Quartz Monzodiorites (Dr, Qz-MzDr), Tonalites (Ton) and Pegmatites (Pgm). The mineralogical composition of the plutonite includes: quartz, plagioclase, orthoclast, microcline, hornblende, pyroxene, biotite, titanite, chlorite, allanite, epidote, zircon, clinozoisite and opaques. Geochemical analysis showed that the plutonite belongs to the calc-alkaline to high-K calc-alkaline series and is characterized as metaluminous I-type. The associated geotectonic setting is an active continental margin (VAG). The plutonite of Kentavros is compared to the plutonite of Xanthi, because they show similarities. Their common characteristics are age, certain petrographic types, values of some chemical elements, geotectonic setting and magma type.
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