New porphyry — Cu±Mo occurrences in the north-eastern Aegean, Greece: Ore mineralogy and epithermal relationships

Abstract

New discoveries of porphyry Cu{$\pm$}Mo mineralization have been made on Limnos and Lesvos islands, in areas covered by hydrothermally altered Miocene shoshonitic volcanic and subvolcanic rocks. The Fakos prospect has, may typical features of porphyry Cu{$\pm$}Mo deposits: K-silicate alteration, barren advanced argillic lithocap, tourmaline-sericite veins and breccias and late quartz veins rich in base and precious metals. Gold and silver are present as electrum, hessite, petzite and an unknown Ag-sulfotelluride, and are mainly enriched in the late veins. The Stipsi prospect is a molybdenum-enriched porphyry system, consisting of a quartz stockwork that contains molybdenite, bismuthinite, galena and sphalerite. Both porphyry systems evolved through several stages of magmatic-hydrothermal action with the late polymetallic quartz veins representing either epithermal style overprints.