Abstract
The Southern Campania Margin (SCM) represents a key area of the Central Mediterranean because it records all the rifting stages of the Tyrrhenian Sea. The interpretation of a seismic dataset calibrated with deep wells and outcrops, using seismic stratigraphy and structural geology methods in a dedicated Geographic Information System (GIS) environment, the seismic depth conversion, the generation of 2-D and 3-D models led to the reconstruction of a polyphased tectono-stratigraphic evolution of the SCM. During the early stage of Tyrrhenian opening a terrigenous transtensional Basin (Langhian-Tortonian Cilento Basin) formed on the Liguride accretionary prism adjacent to the Calabria crystalline terrane. In the SCM the Liguride thrust sheets tectonically overly the Apennine Platform units and both these nappes have been dismembered by Quaternary faults. Three rifting stages, not homogeneously distributed, affected the region since the Lower Pleistocene. They are associated to the deposition of a thick Quaternary succession (A, B and C units). During these Pleistocene stages there was an abrupt change of the extension direction (from NE-SW to NW-SE) accompanying a change of the nappe transport direction of the Southern Apennines. The construction of balanced sections using dedicated software, permitted us to recognize the true geometry of the faults and compute the amount of Quaternary extension of the SCM that results comparable to those calculated for other sectors of the Tyrrhenian margin and further extensional regions worldwide.
Highlights
IntroductionThe Southern Apennines thrust belt trends NW–SE (Fig. 2) and consists of a NE-verging accretionary wedge derived from the Neogene shortening of the Africa-Apulian passive margin
The Southern Campania Margin; is located in the hinge area between the Southern Apennines fold-and-thrust belt and the Southern Tyrrhenian backarc basin and it borders the Calabria terrane made up of pre-Mesozoic basement internal units (Fig. 1).The Southern Apennines thrust belt trends NW–SE (Fig. 2) and consists of a NE-verging accretionary wedge derived from the Neogene shortening of the Africa-Apulian passive margin
The construction of balanced sections using dedicated software, permitted us to recognize the true geometry of the faults and compute the amount of Quaternary extension of the Southern Campania Margin (SCM) that results comparable to those calculated for other sectors of the Tyrrhenian margin and further extensional regions worldwide
Summary
The Southern Apennines thrust belt trends NW–SE (Fig. 2) and consists of a NE-verging accretionary wedge derived from the Neogene shortening of the Africa-Apulian passive margin. It is formed by three main stacked tectonic elements: i) Jurassic-Cretaceous to early Miocene successions of the internal oceanic to transitional deep-sea domains (Liguride accretionary wedge; Bonardi et al, 1988); ii) Triassic to Miocene carbonate platform and slope successions (Apennine carbonate Platform, after Mostardini and Merlini, 1986); iii) Triassic to Miocene Lagonegro Basin successions (Scandone, 1967; Miconnet, 1988).
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