Mantle domains beneath the southern Tyrrhenian: constraints from recent seafloor sampling and dynamic implications

Southern Tyrrhenian Quaternary magmatism represents one example of an active arc/back-arc system where IAB- and OIB-type magmas coexist. IAB-type magmatism is the most common, in both arc and back-arc settings, whereas OIB-type magmas are restricted to few areas. Geochemical and isotopic characteristics of southern Tyrrhenian submarine volcanic samples are here summarized, with special attention to those samples recovered during recent seamounts/seafloor sampling. Petrological data of the most basic lavas have been evaluated with the aim to characterize the mantle sources of IAB and OIB magmas. These data provide important insights into the petrogenesis of the southern Tyrrhenian submarine magmatism and on the possible geodynamic scenario able to explain the coexistence of IAB and OIB magmas in this area.