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http://hdl.handle.net/2122/5772
Authors: | Sani, F.* Bonini, M.* Cerrina Feroni, A.* Mazzarini, F.* Moratti, G.* Musumeci, G.* Corti, G.* Iatta, F.* Ellero, A.* |
Title: | Messinian-Early Pliocene crustal shortening along the Tyrrhenian margin of Tuscany, Italy | Journal: | Italian Journal Geosciences | Series/Report no.: | 2/128(2009) | Publisher: | Società Geologica Italiana | Issue Date: | 2009 | DOI: | 10.3301/IJG.2009.128.2.593 | Keywords: | Northern Apennines hinterland areas structural analysis pluton emplacement |
Subject Classification: | 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.04. Geology::04.04.09. Structural geology 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics |
Abstract: | 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. |
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