Cointrusive shear displacement by sill intrusion in a detachment: A numerical approach

Abstract : Sheared sills are observed at Piton des Neiges (the eroded basaltic volcano of La Réunion) and are a suspected cause of the coeruptive flank displacement of Piton de la Fournaise in 2007. We performed a 2-D numerical study to quantify the perturbation induced by sill injection within a volcanic edifice. Magma is considered as an inviscid and pressurized fluid injected in an initially stable edifice under gravity-controlled extension. Two cases of injection are tested, in an elastic homogeneous edifice or along a detachment controlled by a friction law. We show that sill injection induces tangential displacements. This effect is strongly increased when sills are emplaced along a detachment, producing extension behind the injection and potentially ending in a large-scale flank collapse. Sill injections can thus explain the cointrusive shear deformation observed at Piton des Neiges and the tangential displacements measured at Piton de la Fournaise in 2007.
Type de document :
Article dans une revue
Geophysical Research Letters, American Geophysical Union, 2014, 41 (6), pp.1937-1943. 〈10.1002/2013GL058813〉
Liste complète des métadonnées

Littérature citée [27 références]  Voir  Masquer  Télécharger

https://hal.archives-ouvertes.fr/hal-01136471
Contributeur : Sylvaine Jouhannel <>
Soumis le : lundi 9 octobre 2017 - 17:34:55
Dernière modification le : dimanche 5 novembre 2017 - 15:58:04

Fichier

2014-GRL-Chaput.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Citation

Marie Chaput, Virginie Pinel, Vincent Famin, Laurent Michon, Jean-Luc Froger. Cointrusive shear displacement by sill intrusion in a detachment: A numerical approach. Geophysical Research Letters, American Geophysical Union, 2014, 41 (6), pp.1937-1943. 〈10.1002/2013GL058813〉. 〈hal-01136471〉

Partager

Métriques

Consultations de la notice

360

Téléchargements de fichiers

10