The Tyrrhenian Sea is classified as a back-arc basin (Lavecchia & Stoppa 1990; Zamboni 2003) in the western Mediterranean surrounded, mainly by Italy. Back-arc basins occur ahead of a subduction zone that is rolling back and causes the overlying plate to also move in the same direction, which causes extension (back-arc) of the overlying lithosphere which causes the melting of the mantle to decompression. The subduction zone in this case moved from the northern part of the Tyrrhenian area south-eastwards to where it is now, just south of Calabria (Sartori et al. 2004; Calanchi et al. 2002), with this movement the Tyrrhenian Sea has opened up, so from a geochemical perspective there must be rocks that have a geochemical signature of a subduction process (volcanic arc) and rocks that show a geochemical signature of back-arc rifting to confirm that it is indeed a back-arc rifting arc return (Girolamo 1978). The arc that forms in front of this subduction zone is the Aeolian arc NNW of Sicily (Calanchi et al. 2002). This island arc is made up of melts formed as a product of subduction (partial melting) and is characterized by rocks normally enriched in potassium (K) and is calc-alkaline in nature up to shoshonite (Gertisser & Keller 2000; Lavecchia & Stoppa 1990; Girolamo 1978) with very low TiO values ​​(typically less than 1.1 wt%) and higher K2O values ​​of about 2 wt% (Girolamo 1978). These islands have an island arc composition and are also quite strongly enriched in incompatible elements such as large lithophilic ionic elements (LILEs) (Trua et al. 2010; Lavecchia & Stoppa 1990). The Marsili basin (site 650 9n ODP leg 107), north-west of the Aeolian Arc, in the Southern Tyrrhenian Sea shows a narrowing to...... middle of the map ......and the Tyrrhenian area: a case of control of the lithospheric extension of intracontinental magmatism. Earth and Planetary Science Letters, 99(4), pp.336–350.Panza, G. et al., 2007. Geophysical and petrological modeling of the structure and composition of the crust and upper mantle in complex geodynamic environments: the Tyrrhenian Sea and surroundings. Earth-Science Reviews, 80(1-2), pp.1–46. Sartori, R. et al., 2004. Crustal characteristics along a western-eastern Tyrrhenian transect from Sardinia to the margins of Campania (central Mediterranean). Tectonophysics, 383(3-4), pp.171–192.Trua, T. et al., 2010. The heterogeneous nature of the southern Tyrrhenian mantle: evidence for olivine-hosted melt inclusions from back-arc magmas of the southern Tyrrhenian seamount Marsili. Lithos, 118(1-2), pp.1–16. Zamboni, V., 2003. The Tyrrhenian back-arc basin and the subduction of the Ionian lithosphere. Episodes, 26(3), pp.217–221.