Timing and kinematics of flow in a transpressive dextral shear zone, Maures Massif (Southern France) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Earth Sciences Année : 2020

Timing and kinematics of flow in a transpressive dextral shear zone, Maures Massif (Southern France)

Matteo Simonetti
Rodolfo Carosi
Chiara Montomoli
Michel Corsini
Alessandro Petroccia
  • Fonction : Auteur
John Cottle
Salvatore Iaccarino

Résumé

The Maures–Tanneron Massif and the Corsica–Sardinia Block are two segments of the southern European Variscan belt that separated during the Late Oligocene–Miocene due to the opening of the Western Mediterranean basin. Correlation between the two regions, based mainly on petrologic similarities, is still debated. However, there are no detailed structural and petrochronological constraints on their potential relationships. In northern Sardinia there is well-documented evidence for a dextral transpressive shear zone that initiated after the first stage of frontal collision. In the Maures–Tanneron Massif, despite recognition of an important episode of transpressive deformation, it is still unclear which structures were active during this tectonic regime. We investigate in detail the kinematic of flow, finite strain and the timing of the deformation of the Cavalaire “Fault” (CF), a major ductile shear zone in the Maures–Tanneron Massif. In contrast to previous models, we argue that the CF is a transpressive shear zone characterized by a prevalent component of pure shear, while in-situ monazite geochronology reveals that the CF is initiated at ~ 323 Ma. The new data presented here, based on a multidisciplinary approach document, for the first time, the vorticity of the flow, finite strain and timing of this sector of the East Variscan Shear Zone, a regional-scale shear zone that characterized the Southern European Variscan belt during the late Carboniferous.
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Dates et versions

hal-03578186 , version 1 (17-02-2022)

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Citer

Matteo Simonetti, Rodolfo Carosi, Chiara Montomoli, Michel Corsini, Alessandro Petroccia, et al.. Timing and kinematics of flow in a transpressive dextral shear zone, Maures Massif (Southern France). International Journal of Earth Sciences, 2020, International Journal of Earth Sciences, 109 (7), pp.2261-2285. ⟨10.1007/s00531-020-01898-6⟩. ⟨hal-03578186⟩
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