Abstract
The petrochemical characteristics of volcanoes of the southern Tyrrhenian Sea point to the contemporaneous existence of a calc-alkaline compressive volcanism (Eolian Islands) and basaltic distensive volcanism (the abyssal plain, eastern Sicily, Ustica, and the Strait of Sicily). K-h diagrams of calc-alkaline products support the existence of a 50°–60° WNW dipping inclined seismic zone. A deepening of this zone with time under the Eolian Islands is suggested by the increase of K content observed in recent volcanics. Geochemical data suggest an oceanic down-going slab. Volcanism of basaltic affinity occurs in the back arc, and its distensive character and geophysical features lead us to consider the abyssal plain as a marginal basin produced by spreading. The occurrence of basaltic volcanism in eastern Sicily and Ustica island allows us to define the extension of the oceanic slab and to locate the boundary between converging plates.
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