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The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece

1
Faculty of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2
Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, Greece
3
Department of Geological and Atmospheric Sciences, 253 Science I, Iowa State University, Ames, IA 50011-3212, USA
*
Author to whom correspondence should be addressed.
Appl. Sci. 2021, 11(2), 479; https://doi.org/10.3390/app11020479
Received: 10 December 2020 / Revised: 28 December 2020 / Accepted: 30 December 2020 / Published: 6 January 2021
The Vathi porphyry Cu-Au ± Mo mineralization is located in the Serbo-Macedonian metallogenic province of the Western Tethyan Metallogenic Belt. It is mainly hosted by a latite and is genetically associated with a quartz monzonite intrusion, which intruded the basement rocks of the Vertiskos Unit and the latite, 18 to 17 Ma ago. A phreatic breccia crosscuts the latite. The quartz monzonite was affected by potassic alteration, whereas the latite was subjected to local propylitic alteration. Both styles of alteration were subsequently overprinted by intense sericitic alteration. M-type and A-type veins are spatially associated with potassic alteration, whereas D-type veins are related to the sericitic alteration. Three ore assemblages are associated with the porphyry stage: (1) pyrite + chalcopyrite + bornite + molybdenite + magnetite associated with potassic alteration; (2) pyrite + chalcopyrite related to propylitic alteration; and (3) pyrite + chalcopyrite + native gold ± tetradymite associated with sericitic alteration. A fourth assemblage consisting of sphalerite + galena + arsenopyrite + pyrrhotite + pyrite ± stibnite ± tennantite is related to an epithermal overprint. Fluid inclusion data indicate that the A-type veins and related porphyry-style mineralization formed at 390–540 °C and pressures of up to 646 bars (<2.6 km depth) from boiling hydrothermal fluids. A later condensation of vapor-rich inclusions resulted in a moderately saline fluid (8.4–11.2 wt % NaCl equiv) at temperatures between 311 and 392 °C, which were related to sericitic alteration, D-type veins, and associated metallic mineralization. Subsequent dilution of the moderately saline fluid at lower temperatures (205–259 °C) produced a less saline (1.4–2.9 wt % NaCl equiv.) fluid, which is likely associated with the late epithermal overprint. View Full-Text
Keywords: porphyry deposits; Vathi; copper; gold; REE; Serbo-Macedonian metallogenic province; Vertiskos Unit; fluid inclusions porphyry deposits; Vathi; copper; gold; REE; Serbo-Macedonian metallogenic province; Vertiskos Unit; fluid inclusions
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MDPI and ACS Style

Stergiou, C.L.; Melfos, V.; Voudouris, P.; Spry, P.G.; Papadopoulou, L.; Chatzipetros, A.; Giouri, K.; Mavrogonatos, C.; Filippidis, A. The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece. Appl. Sci. 2021, 11, 479. https://doi.org/10.3390/app11020479

AMA Style

Stergiou CL, Melfos V, Voudouris P, Spry PG, Papadopoulou L, Chatzipetros A, Giouri K, Mavrogonatos C, Filippidis A. The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece. Applied Sciences. 2021; 11(2):479. https://doi.org/10.3390/app11020479

Chicago/Turabian Style

Stergiou, Christos L.; Melfos, Vasilios; Voudouris, Panagiotis; Spry, Paul G.; Papadopoulou, Lambrini; Chatzipetros, Alexandros; Giouri, Katerina; Mavrogonatos, Constantinos; Filippidis, Anestis. 2021. "The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece" Appl. Sci. 11, no. 2: 479. https://doi.org/10.3390/app11020479

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