Polyphase seismic faulting in the Ivrea zone (Italian Alps) revealed by Ar-40/Ar-39 dating of pseudotachylytes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Terra Nova Année : 2011

Polyphase seismic faulting in the Ivrea zone (Italian Alps) revealed by Ar-40/Ar-39 dating of pseudotachylytes

Patrick Monie
Olivier Fabbri
Alain Chauvet

Résumé

P>Most fault-related pseudotachylytes in the Val Sesia area, Ivrea zone, NW Italian Alps, occur in two areas: near the Canavese Line in the Kinzigite Formation paragneisses and in an elongate belt in the Mafic Complex gabbros away from the Canavese Line. Ar-40/Ar-39 dating indicates that pseudotachylytes from the Kinzigite Formation were formed in the late Eocene, likely during the early stages of the collision between the NW corner of the Adriatic indenter and the European margin. Pseudotachylytes from the Mafic Complex were formed under a transpressive strain regime, as suggested by kinematic indicators, and yield Early Cretaceous (Albian) Ar-40/Ar-39 ages. Their formation is possibly related to shortening during the inception of the tectonic inversion of the Adriatic passive margin.

Dates et versions

hal-00617518 , version 1 (29-08-2011)

Identifiants

Citer

Francois Souquiere, Patrick Monie, Olivier Fabbri, Alain Chauvet. Polyphase seismic faulting in the Ivrea zone (Italian Alps) revealed by Ar-40/Ar-39 dating of pseudotachylytes. Terra Nova, 2011, 23 (3), pp.162-170. ⟨10.1111/j.1365-3121.2011.00994.x⟩. ⟨hal-00617518⟩
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