Strike-slip systems as the main tectonic features in the Plio-Quaternary kinematics of the Calabrian Arc
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ORIGINAL RESEARCH PAPER
Strike-slip systems as the main tectonic features in the Plio-Quaternary kinematics of the Calabrian Arc Anna Del Ben Æ Carla Barnaba Æ Alessia Taboga
Received: 14 March 2007 / Accepted: 20 December 2007 / Published online: 16 February 2008 Ó Springer Science+Business Media B.V. 2008
Abstract The oblique and diachronous collision of the Apennine-Maghrebian Chain with the Apulian (in the north-east) and Pelagian (in the south) continental forelands, has determined the characteristic arcuate structure of this orogen. The effects of Plio-Pleistocene deformation of the Calabrian Arc have been analysed on the basis of available reflection seismic profiles and using local timestructural maps reconstructed along the main structures. During this period, internal sectors of the Tertiary chain migrated forward on the oceanic Ionian foreland, and were cut by important strike-slip systems. These last have an orientation approximately coincident with that of the migration of the front, allowing differential movement of the different sectors of the arc, towards the weakly buoyant Ionian oceanic domain. The dataset suggests a clear connection between the development of the strike-slip systems cutting the chain and the direction of tectonic transport, towards the East during Late Messinian/Early Pliocene time, to the ESE during Late Pliocene/Early Pleistocene time, finally to the SSE during the Middle/Late Pleistocene to Present, showing a clockwise rotation in well defined
A. Del Ben (&) C. Barnaba A. Taboga Department of Geological, Environmental and Marine Sciences, EGG, University of Trieste, via Weiss, 1, Trieste 34127, Italy e-mail: [email protected] Present Address: C. Barnaba OGS—Centro di Ricerche Sismologiche, Via Treviso 55, Udine 33100, Italy Present Address: A. Taboga School of Earth, Ocean and Planetary Sciences, Cardiff University, Main College, Park Place, CF10 3YE Cardiff, UK
stages during the kinematic evolution of the chain. The origin of the Strait of Messina during the different phases is also interpreted in the context of the analysed regional tectonic setting. Keywords Calabrian Arc Foreland domain Seismic reflection profiles Strike-slip tectonics Time-structural map
Introduction The Calabrian Arc of southern Italy represents the product of different tectonic events related to the formation of the Alpine Chain (Cretaceous-Paleogene), the Kabilo-Calabride Chain (Upper Oligocene–Lower Miocene), and the South-Apennine-Maghrebian Chain (Upper Miocene– Present) (Amodio-Morelli et al. 1976; Scandone 1982; Bonardi et al. 1994). In this study, we analysed the PlioQuaternary phases of deformation front migration on to the foreland. Several papers have studied the evolution of the SouthApennine-Maghrebian Chain during the different stages of extension in the Tyrrhenian back-arc. Interactions between subducting oceanic crust, collisional processes and backarc extension generally suggest the presence of lithospheric discontinuities bordering the Ionian slab, which result in the di
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