Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Kinematic evolution of a tectonic wedge above a flat-lying décollement: The Alpine foreland at the interface between the Jura Mountains (Northern Alps) and the Upper Rhine graben

Abstract : We estimate strain rates of three parameters that describe the buildup of a tectonic wedge (Jura front, France). The uplift rate on frontal ramps decreases with the slip on the ramps and the coeval increase of vertical loads. The migration rate of the tip of the sole thrust appears to be episodic and faster than the translation rate of the backstop. The long-term tilting rate appears to be constant, whereas the short-term rate is slightly slower. We propose a model of wedge growth that proceeds without underthrusting. In a prefractured medium, the wedge would activate the frontal ramp with a weaker frictional resistance than the forward décollement. An instantaneous forward jump of the deformation front would occur when the resistance on the ramp equals the resistance of the frontal décollement. This model differs from those proposed for accretionary zones, and relates to the backstop of a single tapered orogenic belt.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-brgm.archives-ouvertes.fr/hal-03752393
Contributeur : Frédérique COUFFIGNAL Connectez-vous pour contacter le contributeur
Soumis le : mardi 16 août 2022 - 16:38:13
Dernière modification le : mercredi 17 août 2022 - 03:06:11

Identifiants

Collections

Citation

Bertrand Nivière, Marzio Giamboni, Christophe Innocent, Thierry Winter. Kinematic evolution of a tectonic wedge above a flat-lying décollement: The Alpine foreland at the interface between the Jura Mountains (Northern Alps) and the Upper Rhine graben. Geology, Geological Society of America, 2006, 34 (6), pp.469. ⟨10.1130/G22334.1⟩. ⟨hal-03752393⟩

Partager

Métriques

Consultations de la notice

7