Résumé
The isotopic compositions of basaltic lavas from the Quaternary and Plio-Pleistocene Italian volcanics (Tuscan Magmatic Province, Roman Magmatic Province, Vesuvius, Aeolian Islands, Etna, and Iblean Basin) define binary hyperbolic relationships in the 87Sr/86Sr–206Pb/204Pb–eNd–eHf space. The isotopic compositions of the two end-members of these mixing arrays are assessed by least-squares regression. The mantle-derived component (206Pb/204Pb = 19.8, 87Sr/86Sr = 0.7025, ∑Nd = +8, ∑Hf = +9) is a rather homogeneous mixture of the standard high-m (HIMU) and depleted mantle (DM) components. The crust-derived component (206Pb/204Pb = 18.5, 87Sr/86Sr > 0.715, ∑Nd = -12, ∑Hf = -11) accounts for the enrichment of K and other large-ion-lithophile elements in the Italian volcanics.