SULPHIDE MINERALIZATION FROM EPTADENDRO AND RACHI AREAS IN EASTERN RHODOPE


Α. Χατζηκύρκου
Κ. Μιχαηλίδης
Résumé

The sulphide mineralization from Eptadendro and Rachi areas hosted in the Upper Tectonic Unit of eastern Rhodope is studied. This mineralization is related to a fault zone of NE-SW direction. The orebodies are found along the contacts between granitoid intrusions and meta-ultrabasicbasic rocks as well as within the meta-ultrabasic-basic rocks. The ore mineral assemblages consist of pyrite and chalcopyrite as main minerals, minor sphalerite, galena, magnetite and hematite which form also local concentrations, and traces of Bi-, Ag-, and Co - Ni- minerals. Chlorite, quartz, calcite and sericite are the main gangue minerals. Folding of thin mineralized layers, brittle or ductile deformation, annealing or porphyroblasting of pyrite are typical metamorphic features confirming that mineralization has been affected by a series of metamorphic and deformation events. Pyrite porphyroblasts display a characteristic chemical zonation with higher Ni and Co contents at the marginal zones. A two-stage mineralization process was accepted for the studied area. Firstly, a stratabound mineralization hosted in the ultrabasic-basic rocks was formed in a submarine environment. Later on the intrusion of granitoids remobilized a part of this mineralization into the fault zone. Besides, the magmatic fluids of the granitoids offered new amounts of metals mainly of Zn and Pb.

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  • Economic Geology
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Références
Ashworth, K.L., Billet, Μ.F., Constantinides, D., Demetriades, Α., Katirtzoglou, C. and Michael C. 1988. Base Metal Mineralization in the Evros Region, Ν.E. Greece. In: Friedrich, G.Η and Herzig, P.M. (eds): Base Metal Sulfide Deposits. Springer-Verlag, Berlin-Heidelberg, 169 -181.
Βουδούρης, Π. και Σκαρττέλης, Ν. (1998): Μεταλλοφορίες ετπθερμικού χρυσού-αργύρου στις περιοχές Περάματος (Θράκη) και Λήμνου. Δελτ. Ελλην. Γεωλ. Εταιρ. τόμ. ΧΧΧΙΙ/3, 125-135.
Billett, Μ.F. and Nesbitt, R.W. 1986. Base metal minerallization associated with mafic and ultramafic rocks, eastern Rhodope massif, Greece. Trans. Inst. Min. Metall., 95B: 37 - B45.
Bitzios, D., Constantinides, D., Demades, E., Demetriades, Α., Katirtzoglou, C. and Zachos, S. 1981. Mixed sulphide mineralization of the Greek Rhodope, I.G.M.E., 118 p.
Candela, P.A., Wylie, G.A. and Burke, M.T. 1989. Genesis of the ultramafic rock-associated Fe-Cu-Co-Zn-Ni deposits of the Sykesville district, Maryland Piedmont. Econ. Geol., 84, 663 - 675.
Cannât, M. 1993. Emplacement of mantle rocks in the seafloor at mid-ocean ridges. J. Geophys. Res., 98, B3, 4163-4172.
Δήμου, Ε., Μιχαήλ, Κ. και Serment, R. (1994): Ορυκτολογική σύσταση της εττιθερμικής ττολυμεταλλικής μεταλλοφορίας Πεύκων Ροδόπης. Δελτ. Ελλην. Γεωλ. Εταιρ. τόμ. ΧΧΧ/1, 533 - 550.
Κωνσταντινίδης, Δ., Κατιρτζόγλου, Κ., Μιχαήλ, Κ., Δημητριάδης,Α., Αγγελόπουλος, Α. και Κωνσταντινίδου, Ε. 1983. Μεταλλογενετικός χάρτης Ν. Έβρου. Ι.Γ.Μ.Ε., (εσωτερική έκθεση), 136 σελ.
Leblanc, Μ. and Billaud, P. 1982. Cobalt arsenide orebodies related to an Upper Proterozoic ophiolite: Bou Azzer (Marocco). Econ. Geol., 77, 162 -175.
Michael, C, Katirtzoglou, C, Perdikatsis, V. and Constandinides, D. (1989a): The polymetallic minerallization of the Pefka area, Evros county, Greece. Geologica Rhodopica 1, 332 - 329.
Michael, C, Perdikatsis, V , Dimou, E. and Marantos, I. (1995) : Hydrothermal alteration and the ore deposition in epithermal precious metal deposit of Agios Demetrios, Konos area, northern Greece. Proceedings, XV Congress of the Carpatho-Balcan Geological Association. Geol. Soc. Greece, Sp. Pubi., No. 4, 778-782.
Mposkos, E. 1989. Polymetamorphism in the central and east Rhodope massif. Geologica Rhodopica 1, 153 -159.
Mposkos, E. and Perdikatsis, V. 1989. Eclogite-amphibolites in the East Rhodope massif. Geologica Rhodopica 1,160-168.
Murphy, P. J. and Meyer, G. 1998. A gold-copper association in ultramafic-hosted hydrothermal sulfides from the Mid-Atlandic Ridge. Econ. Geol., 93,1076 -1083.
Nesbitt, W.R., Billet, F.M., Ashworth, L.K., Deniel, C, Contantinides, D., Demetriades, Α., Katirtzoglou, C. Michael, C. Mposkos, E., Zachos, S. and Sanderson, D. 1988. The geological setting of base metal mineralization in the Rhodope region, Northern Greece. ln:J. Boissononas and P. Omenetto (eds). Mineral Deposits within the European Community, Springer-Verlag, Berlin, Heidelberg, 499 - 514.
Voudouris, P. (1997): Epithermal and porphyry type mineralization in Kassiteres area, Thrace (Greece). In: Papunen (ed.), Mineral Deposits: Research and Exploration (Balkema, Rotterdam). Proceedings of 4th Biennial SGA meeting, Turku, Finland, 683-686.
Wipfler, L.E., Buschmann, Β. and Zaykov, V.V. 1999. The mafic-ultramafic hosted massive sulfide deposits of Ishkino, Southern Urals. In: Stanley et al. (eds,) Mineral Deposits: Processes to Processing, Balkema, Rotterdam, 613-616.
Χατζηκύρκου, A. 2003. Μίλέτη θειούχου μεταλλοφορίας περιοχής Επταδένδρου και Ράχης στην Ανατολική Ροδόπη. Διδακτορική Διατριβή, Α.Π.Θ., 232 σελ.
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