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Authors: Toscani, G.*
Di Bucci, D.*
Ravaglia, A.*
Seno, S.*
Fracassi, U.* 
Valensise, G.* 
Title: Propagation of an inherited strike-slip fault through a foreland-chain system: quantitative aspects from analogue modeling and applications
Issue Date: 2009
Series/Report no.: 1/128 (2009)
Keywords: Fault reactivation
orogenic wedge
sandbox models
quantitative analysis
Subject Classification04. Solid Earth::04.04. Geology::04.04.09. Structural geology 
04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques 
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
Abstract: We investigated quantitatively the propagation of a reactivated strike-slip fault through a sedimentary cover. To this end we prepared five simplified analogue models that reproduce a chain with its frontal allochtonous wedge overrunning the foreland. The foreland/ chain deformation follows the reactivation of an inherited strike-slip fault cutting the foreland domain. The observation and quantification of the effects of this reactivation, in particular on the orogenic wedge front, provide new insight on the evolution of this type of tectonic setting. We placed special emphasis on quantifying the structural features observed in the models to (1) interpret the kinematics of the reactivated shear zone, and (2) put forward hypotheses on areas indirectly affected by the reactivated fault. The interpretation of the models was based on an integrated analysis of surface and subsurface data. The results show that the geological setting is strongly influenced by the presence of a reactivated preexisting lineament, that ultimately controls the development and pattern of newly-formed faults. Finally, we present and discuss two natural examples (in Italy Molise-Gondola shear zone, Southern Apennines, and Scicli-Ragusa line, Sicily) in view of the modeling results.
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