Outcrop-scale structures that record a progressive sequence of deformation can be used to clarify the kinematic evolution of an entire fold-and-thrust belt. The temporal progression of the compressional deformation as reconstructed by means of a mesoscopic structural analysis provides a key for unraveling the kinematic history of the Umbria-Marche Apennines (central Italy). Overprinting relationships at outcrop-scale allow for the recognition of three distinct structural stages which are, in sequence: A- layer-parallel shortening; B- folding; C- thrusting. Individual stages are explained in the framework of a progressive deformation model, where shortening of the sedimentary cover was continuous and occurred during a single contractional episode as a consequence of a tip-line folding process. A comparison of this history with those reported from other fold-and-thrust belts shows that layer-parallel shortening, folding and thrusting are sequentially dominant processes in areas which have experienced compressional deformation.
Tavarnelli, E. (1997). Structural evolution of a foreland fold-and-thrust belt: the Umbria-Marche Apennines, Italy. JOURNAL OF STRUCTURAL GEOLOGY, 19(3-4), 523-534 [10.1016/S0191-8141(96)00093-4].
Structural evolution of a foreland fold-and-thrust belt: the Umbria-Marche Apennines, Italy
Tavarnelli, E.
1997-01-01
Abstract
Outcrop-scale structures that record a progressive sequence of deformation can be used to clarify the kinematic evolution of an entire fold-and-thrust belt. The temporal progression of the compressional deformation as reconstructed by means of a mesoscopic structural analysis provides a key for unraveling the kinematic history of the Umbria-Marche Apennines (central Italy). Overprinting relationships at outcrop-scale allow for the recognition of three distinct structural stages which are, in sequence: A- layer-parallel shortening; B- folding; C- thrusting. Individual stages are explained in the framework of a progressive deformation model, where shortening of the sedimentary cover was continuous and occurred during a single contractional episode as a consequence of a tip-line folding process. A comparison of this history with those reported from other fold-and-thrust belts shows that layer-parallel shortening, folding and thrusting are sequentially dominant processes in areas which have experienced compressional deformation.File | Dimensione | Formato | |
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https://hdl.handle.net/11365/1116508