Revisione Tettono-Stratigrafica del settore esterno dell'Appennino Abruzzese settentrionale: nuovi dati dal rilevamento del Foglio 339-Teramo (Progetto CARG)

Francesco Brozzetti (*)
(*) Dipartimento di Scienze della Terra, Università "G. d'Annunzio" di Pescara-Chieti, Via dei Vestini 31, 66013 Chieti. E-mail: f.brozzetti@dst.unich.it

Tectono-Stratigraphic review of the outer sector of the north Abruzzi Apennines: new data from the 339-Teramo sheet of the Carta Geologica d'Italia (CARG Project). This short note reports the new data collected during the survey of the 1:50.000 scale Teramo sheet (CARG Project) on the Messinian-Pleistocene siliciclastic successions cropping out in the northern sector of the periadriatic Abruzzi region. The stratigraphic review of these successions and the study of their spatial relationships led to a partial redefinition of the main regional structural units and of their deformation timing. In particular, as regards the aforesaid topics, the main results can be resumed in the following points: • exemplification of the overall frame of the turbiditic successions which, on the basis of new biostratigraphic and petrographic data, can be referred exclusively to the Laga and Cellino fms; no arguments suggesting the existence of intermediate units (as f.e. the Teramo Flysch Auctt.) have been confirmed; • remarkable improvements in the internal stratigraphic subdivision of the 3 main outcropping fms (Laga, Cellino and Mutignano fms) through the recognition and the definition of several sub-units; • detailed mapping of either the major thrust-traces bounding regional tectonic units, or the minor thrust-traces separating narrow tectonic elements; • mapping of the Middle Pliocene and Late Pliocene unconformities characterising the Mutignano fm and definition of the temporal extent of the associated hiatuses; • pointing out chronological constraints for the nucleation of the contractional structures and inferences about their influence on the coeval syn-tectonic basins.

Foglio 339-Teramo, stratigrafia delle successioni silicoclastiche sin-orogeniche e tardo-orogeniche, assetto strutturale dell'avanfossa mio-pliocenica abruzzese