Deciphering the Evolution of Adjacent Volcanogenic Massive Sulfide (VMS) Systems Based on Radiogenic and Stable Isotopes, the Case of Ermioni, Argolis Peninsula, Ne Peloponnese, Greece

The study follows previous work on Ermioni VMS and addresses in detail the formation evolution of two adjacent systems, Karakasi Roro. It is based a stable radiogenic isotopic composition sulfides ganguefrom stringer (Karakasi) massive (Roro) ore. geochemistry Pb noble gases (Ar-He) pyrite from both sites indicates development deep evolved heat possibly metal source attributed to subduction material (Pindos oceanic crust). differences (Fe, S) (Sr, Ar) compositions between depict variation geologic environment formation, particular effect seawater. higher δ57Fe δ34S values Roro are direct interaction hot, ascending metal-bearing hydrothermal fluids with cold oreis characterized by 87Sr/86Sr ratios Ar (as 40Ar/36Ar), indicating ore-bearing, crustal (hanging-wall turbidites). During approximate 0.5 Ma period separating system migrated east west, at same time free discharge seafloor (Roro—easterly), resembling contemporary style mound-shaped sulfides, sediment-confined, subseafloor (Karakasi—westerly).