GNGTS 2017 - 36° Convegno Nazionale

134 GNGTS 2017 S essione 1.2 Low-Angle Quaternary extension in Northern Calabria: constrains from field geology and geophysical data D. Cirillo, F. Brozzetti, G. Lavecchia CRUST-DiSPUTer, Università G. d’Annunzio Chieti, Italy Introduction. A number of works, dealing with the Quaternary extension of the Italian Apennines, highlighted the role of Low Angle Normal Faults (LANFs) in accomodating large amount of crustal stretching (Carmignani and Kligfield, 1990; Artoni et al., 1992; Barchi et al., 1999; Boncio et al., 2000; Collettini and Barchi, 2002; Brozzetti et al., 2009; Mirabella et al., 2011). In this work, we suggest that two ~ N-S striking, east-dipping LANFs, outcropping over distance of nearly 90 km, have been driven the Pleistocene to present extension of the Calabro- Lucania boundary and of the northern Calabrian Arc (Fig. 1). Through detailed geological mapping, integrated with structural analysis and, locally, with interpretation of seismic lines, we have defined the surface and subsurface geometry of these regional structures and defined their kinematics. Moreover along two nearly W-E oriented transects, we investigated the relationships with the related basins and with the sin-and antithetical associated fault sets. The Lucania-northern Calabria Detachment Fault (LCDF). The structure, hereinafter referred to as the Lucania-northern Calabria Detachment Fault (LCDF) developes along the east slope of the Mts Gada-Ciagola ridge which is juxtaposed between the Mercure Quaternary basin and the Thyrrhenian sea. Evidence of the LCDF are documented, in the field, for nearly 30 km but further north (Fig. 1), its possible continuation can be recognized in the widespread younger-on-older tectonic contacts, described in the literature and mapped in the published geological maps (D’Argenio et al., 1987; D’Argenio and Ietto, 1988). Fig. 1 - a: Structural sketch map of the Thyrrhenian-Apennine system showing Quaternary extensional fault systems and the Neogene-Quaternary LANFs recognized in the literature. Red heavy lines refer to the east dipping normal fault, blue lines depict the major west-dipping normal faults; b: the main east-dipping (red) and west-dipping (blue) Quaternary normal faults affecting the study area are shown: most of these faults were highlighted during a recent and original survey carried out in the frame of a research project funded by the Dipartimento della Protezione Civicile and by Istituto Nazionale di Geofisica e Vulcanologia (DPC-INVG Seismological project S1).