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Title

Molybdenite occurrences in Greece: mineralogy, geochemistry and depositional environment

Authors
Voudouris, P.
Melfos, V.
Spry, P.G.
Kartal, T.
Published in Christofides, G., Kantiradis, N., Kostopoulos, D.S., & Chatziperos. A.A. Proceedings of the XIX Congress of the Carpathian Balkan Geological Association. Thessalonique (Grèce) - 23-26 septembre 2010 - . 2010, p. 369-378
Collection Special volume; 100
Abstract Molybdenite occurs mainly in three mineralization types in Greece: (a) porphyry Mo-Cu-(±Te-Ag-Au), (b) reduced intrusion-related Mo-W systems (skarn, intrusion-hosted) and (c) shear zone-related Cu-Au-Bi-Mo. In porphyry-Mo-Cu prospects the molybdenite is the main ore constituent together with pyrite in quartz stockworks crosscutting sericite±carbonate altered porphyry stocks (dacite at Pagoni Rachi/Kirki, Myli/Esymi, Konos/Sapes, Melitena/Rhodopi and Stypsi/Lesvos; microgranite at Ktismata/Maronia; monzonite at Sardes/Limnos, Fakos/Limnos and Skouries/Chalkidiki). Reduced intrusion-related systems are characterized by the presence of molybdenite, pyrite and wolframite-scheelite in intrusion-hosted sheeted quartz veins and/or dissemination (granodiorite at Kimmeria/Xanthi, Plaka/Lavrion and leucogranite at Pigi/Kilkis and Seriphos) and skarn-hosted ores (Kimmeria/Xanthi). Finally in the shear-zone Stanos prospect molybdenite accompanies chalcopyrite, native Bi, Bi-tellurides and sulfosalts. The studied molybdenites display a wide spectrum of their rhenium content ranging from almost Re-free molybdenites at Stanos, to very low-Re molybdenite in the intrusion-related systems (Lavrion, Serifos, Pigia and Kimmeria), and high to ultrahigh-Re molybdenites in the northern Greek porphyries. The rare mineral rheniite (ReS2), occurs along with Fe-Cu sulfides, Pb oxides, and native Sn in Pagoni Rachi and Konos prospects. Rheniite and high-Re molybdenite precipitated under oxidizing conditions and from relatively acid hydrothermal solutions, whereas Re-poor molybdenites are indicative of reduced conditions mostly dominant in the intrusion-related systems. At the northern Greek porphyry-Mo prospects, magmas previously enriched from their mantle source rocks were responsible for extreme contents of rhenium in molybdenite.
Keywords Molybdeniterheniitemantle-crust originoxidizing vs reducing fluids
Full text
Structures
Research group Mineral Resources and Geofluids
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VOUDOURIS, P. et al. Molybdenite occurrences in Greece: mineralogy, geochemistry and depositional environment. In: Christofides, G., Kantiradis, N., Kostopoulos, D.S., & Chatziperos. A.A. (Ed.). Proceedings of the XIX Congress of the Carpathian Balkan Geological Association. Thessalonique (Grèce). [s.l.] : [s.n.], 2010. p. 369-378. (Special volume; 100) https://archive-ouverte.unige.ch/unige:28916

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