The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2019

The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles

M. Laurencin
B. Marcaillou
D. Graindorge
F. Klingelhoefer
M. Boucard
M. Laigle
S. Lallemand
L. Schenini

Résumé

Strain partitioning related to oblique plate convergence has long been debated in Northern Lesser Antilles. Geophysical data acquired during the ANTITHESIS cruises highlight that the sinistral strike‐slip Bunce Fault develops along the vertical, long, and linear discontinuity between the sedimentary wedge and a more rigid backstop. The narrowness of the 20‐ to 30‐km‐wide accretionary wedge and its continuity over ~850 km is remarkable. The Bunce Fault extends as far south as 18.5°N where it anastomoses within the accretionary prism where the sharp increase in convergence obliquity possibly acts as a mechanical threshold. Surface traces related to subducting seamounts suggest that 80% of the lateral component of the convergent motion is taken up by internal deformation within the accretionary prism and by the Bunce Fault. The absence of crustal‐scale, long‐term tectonic system south of the Anegada Passage casts doubt upon the degree of strain partitioning in the Northern Lesser Antilles.

Domaines

Tectonique
Fichier principal
Vignette du fichier
Laurencin_et_al-2019-Geophysical_Research_Letters.pdf (2.03 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02318584 , version 1 (17-10-2019)

Identifiants

Citer

M. Laurencin, B. Marcaillou, D. Graindorge, Jean-Frederic Lebrun, F. Klingelhoefer, et al.. The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles. Geophysical Research Letters, 2019, 46 (16), pp.9573-9582. ⟨10.1029/2019GL083490⟩. ⟨hal-02318584⟩
212 Consultations
112 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More