Μελέτη της μεταλλοφορίας πορφυριτικού τύπου στην Κορυφή Κιλκίς
Περίληψη
Λέξεις κλειδιά: πορφύρης, Κορυφή, γνεύσιος, πορφυριτική μεταλλοφορία, ρουτίλιο, σιδη-ροπυρίτης, μοναζίτης, χαλκοπυρίτης, Σερβομακεδονική μάζα, σπάνιες γαίες, θειούχα μεταλλοφορία.
In the wider area of Korifi settlement, there is a porphyritic system, which is in contact with gneiss. The area belongs geotectonically to the unity of Vertisco, a unit belonging to the Serbo-Macedonian mass. The crystallization of sub-volcanic formation has led to the creation of a mineralization that is housed in both the parent and the neighboring rock. The mineralogy of porphyry (parent rock) consists of sanidine, albite, quartz, biotite, phlogopite, monazite, rutile and zirconium, it also displays the characteristic porphyry tissue and called as porphyrite granite-granodiorite. The mineralization in porphyry occurs in the form of dispersions or microfibers and consists of pyrite, chalcopyrite, magnitopyrite and secondary covellite. Covellite is formatted by the oxidation of chalcopyrite. The gneiss (neighboring rock) due to the tectonism it has suffered, consists of numerous branches, which functioned as roads and spaces of deposits of the cargo of the porphyry metallic fluids. The gneiss shows the genus texture and consists of minerals of: quartz, orthoclast, albite, anorthoclase, oligoclase, pycnochlorite, diabantite, sericite, hematite, ilmenite, biotite, epidote, titanite, muscovite and rutile. The mineralization occurs in the form of microfibers and consists of pyrite, chalcopyrite and secondary covelline. Of particular geochemical interest are the rutile and the monazite that are found in porphyry. The rutile appears tiny al-to-shaped and is characterized by a zoning, results of a partial tungsten (W) enrichment. Its chemical composition is the presence of metals such as: vanadium (V2O5 to 4,49wt%), niobium (Nb2O5 to 4,48wt%), tungsten (WO3 to 9,89wt%) and tantalum (Ta2O5 to 2,49wt%). On the other hand, the monazite appears with small rounded crystals discernible in the scanning electron microscope and contains significant content in rare earths, such as lanthanum (La2O3 to 21,21wt%), cerium (Ce2O3 to 37,09 wt%), neodymium (Nd2O3 to 24,04 wt.%), samarium (Sm2O3 to 4,39 wt%) Yttrium (Y2O3 to 2,15 wt%) and thorium (ThO2 to 28,37 wt%), also found a low uranium content (UO3 to 2,2 wt%). From the study of the samples, it appears that the origin of the mineralization is associated with the crystallization of the porphyry and due to the origin of the parent rock, the percentage of participation of the mineral minerals in it and that the sampling was carried out in surface appearance of the formation, the porphyry samples are parts of the porphyry system affected by more than one alteration (overprint), namely the potassic, the propylitic and the sericitic-phyllitic alteration zone.
Key words: porphyry, Korifi, gneiss, porphyry deposit, rutile, pyrite, monazite, chalcopy-rite, Serbo-Macedonian mass, rare elements, sulphurous deposit.
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