Structural and petrological analyses on the Alì Unit, in the Peloritani Thrust Belt, document the first evidence for Alpine exhumation associated with syn-orogenic extension in this part of the Calabria-Peloritani Arc. The Alì Unit displays ductile structures occurred during three Alpine deformation phases (Da1, Da2, Da3). Da1 and Da3 developed in a contractional context, whereas Da2 was generated in an extensional regime. The present-day tectonic contact between the Alì Unit and the overlying Mandanici Unit is interpreted as a low-angle extensional detachment responsible for the metamorphic break between the two units. Structural overprinting relationships indicate that the development of Da2 structures and related tectonic exhumation occurred during syn-convergence extension, and were followed by further nappe stacking in the Peloritani Belt.
Syn-orogenic extension in the Peloritani Alpine Thrust Belt (NE Sicily, Italy): evidence from the Ali Unit [Extension synorogénique dans la chaîne alpine péloritaine (Nord-Est de la Sicile, Italie) : l’exemple de l’unité d’Alì]
SOMMA, Roberta;MESSINA, Antonia;
2005-01-01
Abstract
Structural and petrological analyses on the Alì Unit, in the Peloritani Thrust Belt, document the first evidence for Alpine exhumation associated with syn-orogenic extension in this part of the Calabria-Peloritani Arc. The Alì Unit displays ductile structures occurred during three Alpine deformation phases (Da1, Da2, Da3). Da1 and Da3 developed in a contractional context, whereas Da2 was generated in an extensional regime. The present-day tectonic contact between the Alì Unit and the overlying Mandanici Unit is interpreted as a low-angle extensional detachment responsible for the metamorphic break between the two units. Structural overprinting relationships indicate that the development of Da2 structures and related tectonic exhumation occurred during syn-convergence extension, and were followed by further nappe stacking in the Peloritani Belt.Pubblicazioni consigliate
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