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Multi-temporal tectonic evolution of Capo Granitola and Sciacca foreland transcurrent faults (Sicily channel)


Ferrantiabc, F.Peped, G.Barrecabe, M.Meccarielloab C.Monacobe

aDipartimento di Scienze della Terra, dell'Ambiente e delle Risorse, Università di Napoli “Federico II”, Napoli, Italy
bCRUST - Centro inteRUniversitario per l'analisi SismoTettonica tridimensionale con applicazioni territoriali, Italy
cINGV-Sezione Roma 1, Italy
dDipartimento di Scienze della Terra e del Mare (DISTEM), Università di Palermo, Palermo, Italy
eDipartimento di Scienze Biologiche, Geologiche e Ambientali, Università of Catania, Catania, Italy
 

Tectonophysics

Volume 765, 20 August 2019, Pages 187-204
 
Abstract

Joint analysis of high-penetration multi-channel and high-resolution single-channel seismic reflection profiles, calibrated by deep well boreholes, allowed a detailed reconstruction of the Late Miocene to Recent tectonic history of the Capo Granitola and Sciacca fault systems offshore southwestern Sicily. These two fault arrays are part of a regional system of transcurrent faults that dissect the foreland block in front of the Neogene Sicilian fold and thrust belt. The Capo Granitola and Sciacca faults are thought to reactivate inherited Mesozoic to Miocene normal faults developed on the northern continental margin of Africa. During Latest Miocene-Pliocene, the two ~NNE-SSW striking faults were active in left transpression, which inverted Late Miocene extensional half-grabens and created push-up ridges along both systems. Tectonic activity decreased during the Pleistocene, but transpressional folds deform Middle-Late Pleistocene sediments as well, suggesting that the two fault systems are active. The ~40 km long longitudinal amplitude profile of 1st order folds (Capo Granitola and Sciacca anticlines) shows ~15–20 km bell-shaped undulations that represents 2nd order folds. The length of these undulations together with the map pattern of faults allowed to divide the CGFS and SFS into two segments, northern and southern, respectively. Total uplift of the Sciacca Anticline is twice than the uplift of the Capo Granitola Anticline. Incremental fold growth rates decreased during time from 0.22 mm/yr (Capo Granitola Anticline) and 0.44 mm/yr (Sciacca Anticline) in the Pliocene, to 0.07 and 0.22 mm/yr, respectively, during the last ~1.8 Ma.

 

Figure:

Simplified structural map of southwest Sicily offshore (adapted from Argnani et al., 1987; Antonelli et al., 1988; Civile et al., 2018) and onshore (modified after Basilone, 2012). Focal mechanism in the foreland area from Soumaya et al. (2015). Isobaths of the Pliocene-Quaternary from the Structural Model of Italy (Bigi et al., 1989). The bathymetric metadata and Digital Terrain Model data products have been derived from the EMODnet Bathymetry portal - http://www.emodnet-bathymetry.eu.  Labels are as follow: ATF, Adventure Thrust Front; CGFS, Capo Granitola Fault System; SFS, Sciacca Fault System; GNF, Gela Nappe Front; MV, Mazara del Vallo; CG, Capo Granitola; CV, Castelvetrano; CSM, Capo San Marco; SA, Sciacca;  GB, Graham Bank; TB, Terribile Bank; NB, Nerita Bank.
 
Keywords: Multiscale analysis; Basin inversion; Strike-slip faults; Fold growth rates; Pelagian foreland; SW Sicily offshore