Vincoli biostratigrafici sull'età del vulcanismo alcalino paleozoico dei Monti Peloritani (Sicilia nord-orientale)

Roberta Somma (*), Pilar Navas-Parejo (**), Agustín Martín-Algarra (**), Carlos Martínez-Pérez (***), Vincenzo Perrone (°) & Rosario Rodríguez-Cañero (**)
(*) Dipartimento di Scienze degli Alimenti e dell'Ambiente, Messina University, Italy. (**) Departimento de Estratigrafía y Paleontología, Granada University, Spain. (***) Earth Sciences School, Bristol University, UK. (°) Dipartimento di Scienze della Terra, della Vita e dell'Ambiente, Urbino University, Italy.

The Palaeozoic successions of the Longi-Taormina Unit (Peloritani Mountains, north-eastern Sicily) are formed mainly by slightly metamorphosed siliciclastic sequences, containing Upper Ordovician acidic rocks and undated alkaline volcanic layers at different stratigraphic heights. These Palaeozoic successions are locally capped by fossiliferous calcareous beds. A detailed biostratigraphic study on conodonts yielded by these carbonates has revealed an Upper Silurian-Lower Devonian age for this interval. These new biostratigraphic data are very useful as they indicate that some of the undated alkaline volcanic layers, being overlain by Upper Silurian-Lower Devonian conodont-bearing metalimestones, are surely related to volcanism not younger than the Late Silurian-Early Devonian and presumably Silurian in age.

conodonti, Devoniano, Siluriano, vulcanismo alcalino