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CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Pisa, Italy
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- PublicationRestrictedMessinian-Early Pliocene crustal shortening along the Tyrrhenian margin of Tuscany, Italy(2009)
; ; ; ; ; ; ; ; ; ;Sani, F.; Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Florence, Italy ;Bonini, M.; CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, U.O. Firenze, Florence, Italy ;Cerrina Feroni, A.; CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Pisa, Italy ;Mazzarini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Moratti, G.; CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, U.O. Firenze, Florence, Italy ;Musumeci, G.; Dipartimento di Scienze della Terra, Università degli Studi di Pisa, Pisa, Italy ;Corti, G.; CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, U.O. Firenze, Florence, Italy ;Iatta, F.; Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Florence, Italy ;Ellero, A.; CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Pisa, Italy; ; ; ; ; ; ; ; This paper illustrates the results of structural studies carried out in the western margin of Tuscany along a major crustal structure. Surface deformation of sediments filling different basins aligned on top of this major structure (from north to south: the Fine Basin, the Sassa–Guardistallo basin, the Rio Guardigiano area in the Lustignano basin) allow us to date its tectonic activity to the Messinian-Early Pliocene. In these areas, structures such as reverse and strike-slip faults and mesoscopic folds are widely developed. Structural analysis determined a compressive stress field with the σ1 oriented from E-W to NE-SW active from Messinian to Early Pliocene. At the southern end of this crustal structure, the Gavorrano antiform and the granitic pluton (radiometric age of granite ~4.4 Ma) coring this fold correlate with a thrust ramp anticline at depth, and thus constrain thrust activity to the Early Pliocene. These data document a Messinian–Early Pliocene compressive activity that contrasts with models invoking continuous extensional tectonics affecting the hinterland since the Late Oligocene-Middle Miocene in the frame of a back-arc-slab retreating process. The results presented therefore raise the question of which geodynamical model could account for such a complex structural evolution of Northern Apennines hinterland.339 19