Résumé : Sr-isotopic measurements were performed on samples of each main stage of eruption of the various Eolian islands, coupled with REE and Rb, Sr, U, Th, Hf and Sc determinations.A subcrustal origin is invoked for the older calc-alkaline series related to the subduction zone of the Eolian arc confirming the view of Barberi et al. (1974). A different explanation is given for the shoshonitic association which shows higher87Sr/86Sr values and different REE concentrations, making a direct derivation from the mantle doubtful. Contamination by crustal material or anatexis of the lower crust are considered as possible mechanisms. Finally the significance of a shoshonitic series is questionned.