Balestro, Gianni

Barbero, Edoardo

Centelli, A.

De Caroli, Sara

Festa, Andrea

Succo, Andrea

English

DE CAROLI, Sara

Institutional Research Information System University of Turin

Geophysical Research AbstractsVol. 18, EGU2016-8844-1, 2016EGU General Assembly 2016© Author(s) 2016. CC Attribution 3.0 License.The role of Variscan to pre-Jurassic active extension in controlling thearchitecture of the rifted passive margin of Adria: the example of theCanavese Zone (Western Southern Alps, Italy)Andrea Succo, Sara De Caroli, Arianna Centelli, Edoardo Barbero, Gianni Balestro, and Andrea FestaUniversity of Turin, Earth Sciences Department, Via Valperga Caluso, 35 - 10125 Torino, Italy.The Canavese Zone, in the Italian Western Southern Alps, represents the remnant of the Jurassic syn-rift stretching,thinning and dismemberment of the distal passive margin of Adria during the opening of the Penninic Ocean (i.e.Northern Alpine Tethys). Our findings, based on detailed geological mapping, structural analysis and stratigraphicand petrographic observations, document however that the inferred hyper-extensional dismemberment of thisdistal part of the passive margin of Adria, up to seafloor spreading, was favored by the inherited Variscan geometryand crustal architecture of the rifted margin, and by the subsequent Alpine-related strike-slip deformation. Thenew field data document, in fact, that the limited vertical displacement of syn-extensional (syn-rift) Jurassic faultswas ineffective in producing and justifying the crustal thinning observed in the Canavese Zone. The deformationand thinning of the continental basement of Adria are constrained to the late Variscan time by the unconformableoverlying of Late Permian deposits. Late Cretaceous-Early Paleocene and Late Cenozoic strike-slip faulting (i.e.Alpine and Insubric tectonic stages) reactivated previously formed faults, leading to the formation of a complextectonic jigsaw which only partially coincides with the direct product of the Jurassic syn-rift dismemberment ofthe distal part of the passive margin of Adria. Our new findings document that this dismemberment of the riftedcontinental margin of Adria did not simply result from the syn-rift Jurassic extension, but was strongly favoredby the inheritance of older (Variscan and post-Variscan) tectonic stages, which controlled earlier lithosphericweakness. The formation of rifted continental margins by extension of continental lithosphere leading to seafloorspreading is a complex and still poorly understood component of the plate tectonic cycle. Geological mappingof rifted continental margins may thus provide significant information to better understand and model the relatedprocesses, and explain the geometry of those margins as observed by means of seismic imaging.

The role of Variscan to pre-Jurassic active extension in controlling the architecture of the rifted passive margin of Adria: the example of the
Canavese Zone (Western Southern Alps, Italy)

https://iris.unito.it/bitstream/2318/1621394/1/Succo%20et%20al_EGU2016-8844.pdf

The role of Variscan to pre-Jurassic active extension in controlling the architecture of the rifted passive margin of Adria: the example of the

Canavese Zone (Western Southern Alps, Italy)

The role of Variscan to pre-Jurassic active extension in controlling the architecture of the rifted passive margin of Adria: the example of the Canavese Zone (Western Southern Alps, Italy)

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