New Insights on the Ermioni VMS Ore Based on Ore Texture and Host Rock Lithology and Geochemistry (SE Argolis Peninsula, Peloponnese, Greece)
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The formerly described as Cyprus-type Ermioni Volcanogenic Massive Sulfide (VMS) mineralization was investigated in a bid to provide new insights on the ore type, and the corresponding geotectonic setting of ore formation. Pyrite is the major ore phase, with minor chalcopyrite and sphalerite. The identified ore textures include massive, stringer and depleted ore types, and the geochemical investigation of the massive ore revealed that the Co content and the Cu/(Cu + Zn) ratio fall within the value ranges associated with the Besshi-type of deposits. The ore is hosted in reworked mafic volcanics and Tertiary terrigenous sediments, including shales, arkoses and sandstones. The texture of the host volcanics is remarkably different from the typical host pillow lava texture of Cyprus-type mineralizations. Additionally, the typical Cyprus-type rock succession, including mafic pillow lavas attached to both of the footwall and the hanging wall, is absent. The trace elements’ geochemistry revealed that the Ermioni host volcanics range from calc-alkaline to island arc tholeiites, indicating a supra-subduction zone setting in close proximity to the continental margin, as identified by the host turbidites high silica content.
KeywordsVolcanogenic massive sulfides Besshi-type Massive and stringer ore Calc-alkaline mafic volcanics Turbidites
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