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paper-31892.pdf (English)
Δημοσιευμένα: Jan 13, 2023
DOI: https://doi.org/10.12681/bgsg.31982
Λέξεις-κλειδιά:
english
Olga Sykioti
National Observatory of Athens
https://orcid.org/0000-0003-1301-6450
Athanassios Ganas
National Observatory of Athens
https://orcid.org/0000-0002-1937-3283
Charalampos Vasilatos
National and Kapodistrian Universtity of Athens
https://orcid.org/0000-0001-6162-3402
Zacharenia Kypritidou
National and Kapodistrian Universtity of Athens
https://orcid.org/0000-0003-0095-5563
Περίληψη

Τις τελευταίες δεκαετίες, η αυξανόμενη πρόοδος στην επεξεργασία των δορυφορικών δεδομένων για την αξιοποίησή τους στον εντοπισμό πιθανών θέσεων υδροθερμικών εξαλλοιώσεων και παρουσίας ορυκτών πόρων έχει αποτελέσει αντικείμενο εντατικής έρευνας. Στην παρούσα εργασία, παρουσιάζουμε τα αποτελέσματα μιας μελέτης που συνδυάζει εργαστηριακές αναλύσεις και επεξεργασία δορυφορικών δεδομένων για την ορυκτολογική εξέταση ζώνης εξαλλοίωσης από την διείσδυση γρανιτοειδούς  που εντοπίστηκε στην επιφάνεια της νησίδας «Κουτάλα» στην περιοχή της Λαυρεωτικής. Στόχος είναι η διερεύνηση της δυνατότητας των δορυφορικών δεδομένων Sentinel-2 και WorldView-3 VNIR στην ανίχνευση και χαρτογράφηση ορυκτών εξαλλοίωσης που ευρέθησαν κατά τις εργαστηριακές αναλύσεις δειγμάτων τα οποία πιθανώς να συνδέονται με Fe-Mn μετάλλευμα. Για τον σκοπό αυτό, εφαρμόστηκαν δύο μέθοδοι, φασματοσκοπία ανάκλασης και φασματικοί δείκτες. Στην πρώτη μέθοδο, συλλέγονται οι φασματικές υπογραφές όλων των ορυκτών που εντοπίστηκαν στην περιοχή από φασματικές βιβλιοθήκες. Κατόπιν εφαρμόζεται μετασχηματισμός των τιμών ανακλαστικότητας με την αφαίρεση του συνεχούς. Στη συνέχεια, αναζητώνται οι απορροφήσεις που χαρακτηρίζουν αποκλειστικά το κάθε ορυκτό για τον κάθε αισθητήρα. Ο αισθητήρας του οποίου τα φασματικά κανάλια μπορούν και ανιχνεύουν τα περισσότερα ορυκτά εξαλλοίωσης επιλέγεται για την χαρτογράφησή τους. Η δεύτερη μέθοδος αφορά στον υπολογισμό και παραγωγή χαρτών φασματικών δεικτών, όταν υπάρχουν τα απαραίτητα κανάλια. Ο δείκτης που ανιχνεύει τρισθενή σίδηρο υπολογίζεται και στους δύο δορυφορικούς αισθητήρες. Ο δισθενής σίδηρος και ο δείκτης εξαλλοίωσης υπολογίζονται μόνο με τα δεδομένα Sentinel-2 λόγω των δύο καναλιών που διαθέτει στο μικροκυματικό υπέρυθρο. Τα αποτελέσματα της μελέτης δείχνουν ότι οι εργαστηριακές μετρήσεις και η επεξεργασία των δορυφορικών δεδομένων συμφωνούν και είναι συμπληρωματικές. Τα δορυφορικά δεδομένα παρέχουν πληροφορία ως προς την χωρική κατανομή των ορυκτών πάνω στο νησί. Συγκεκριμένα, προκύπτει ότι τα δεδομένα WorldView-3 VNIR, ανιχνεύουν μόνο την παρουσία γκαιτίτη και Mn_οξειδίων/υδροξειδίων. Αντίθετα, τα δεδομένα Sentinel-2 φαίνεται ότι είναι ικανά να ανιχνεύσουν (ι) την εξαλλοίωση καθώς και (ιι) όλα τα ορυκτά που συνδέονται με πιθανή παρουσία Fe-Mn μεταλλεύματος, είτε έχουν τρισθενή είτε δισθενή σίδηρο στη σύστασή τους. Οι χάρτες που προκύπτουν δείχνουν ότι υπάρχει, σε διαφορετικό βαθμό, σημαντική εξαλλοίωση σε όλη την επιφάνεια του νησιού η οποία συνδέεται με την μαγματική διείσδυση. Ωστόσο, η εξαλλοίωση είναι πιο ισχυρή στο ανατολικό τμήμα της νησίδας όπου παρατηρείται και η επαφή σχιστολίθων/γρανιτοειδούς. Με την παρούσα μελέτη, για πρώτη φορά στη νησίδα (ι) γίνεται ανίχνευση και χαρτογράφηση ορυκτών που συνδέονται με πιθανή παρουσία Fe-Mn μεταλλεύματος και (ιι) παράγονται χάρτες ορυκτών εξαλλοίωσης οι οποίοι παρέχουν πληροφορία τόσο για την χωρική κατανομή των ορυκτών στην επιφάνεια όσο και έμμεσες εκτιμήσεις του βαθμού παρουσίας τους.

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Λήψεις
Τα δεδομένα λήψης δεν είναι ακόμη διαθέσιμα.
Βιογραφικά Συγγραφέων
Olga Sykioti, National Observatory of Athens

Δρ. Όλγα Συκιώτη

Κύρια Ερευνήτρια

Ινστιτούτο Αστρονομίας, Αστροφυσικής, Διαστημικών Εφαρμογών και Τηλεπισκόπησης (ΙΑΑΔΕΤ/ΕΑΑ)

Εθνικό Αστεροσκοπείο Αθηνών

Athanassios Ganas, National Observatory of Athens

Δρ. Αθανάσιος Γκανάς

Διευθυντής Ερευνών

Γεωδυναμικό Ινστιτούτο

Εθνικό Αστεροσκοπείο Αθηνών

Charalampos Vasilatos, National and Kapodistrian Universtity of Athens

Χαράλαμπος Βασιλάτος

Επίκουρος Καθηγητής

Τομέας Οικονομικής Γεωλογίας και Γεωχημείας

Τμήμα Γεωλογίας και Γεωπεριβάλλοντος

Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών

Zacharenia Kypritidou, National and Kapodistrian Universtity of Athens

Δρ. Ζαχαρένια Κυπριτίδου

Εργαστηριακό Διδακτικό Προσωπικό (Ε.ΔΙ.Π.)

Τομέας Οικονομικής Γεωλογίας και Γεωχημείας

Τμήμα Γεωλογίας και Γεωπεριβάλλοντος

Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών

 

 

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