Bio-Geochemical Processes: Insights from Fe-Mn Mineralization in the Aegean Sea (Greece)

In this study, we have compiled new and existing mineralogical geochemical data on Fe-Mn mineralization from the Aegean region [Attica (Grammatiko, Legrena, Varnavas), Evia Milos islands], aiming to provide insights genesis of in that its potential environmental implications. A common feature those deposits is relatively low Cr, Co, V, Ni, Mo, Cd content, whereas Ba, As, W, Cu, Pb, Zn show remarkably variable values. The Mn-Fe exhibit highest tungsten while a positive trend between MnO combined with negative Fe2O3 suggests preference W Mn-minerals. occurrence bacterio-morphic Fe-Mn-oxides/hydroxides within mineralizations studied region, indicates important role micro-organisms into redox reactions. Moreover, presence Fe-Mn-deposits, reflecting organic matter confirms shallow marine environment for their deposition. salient Varnavas ores sodium chloride coated fossilized micro-organisms, suggesting development solution containing high Na Cl concentrations. Furthermore, an point view, consideration given bioavailability elements such as related above-mentioned mineralizations. bio-accumulation factor (Wplant/Wsoil × 100) recorded Neogene sedimentary basins Attica, Grammatiko mineralization, reflects mobility under alkaline conditions impact similar elevated content.