Title :

Pervasive detachment faults within the slow spreading oceanic crust at the poorly coupled Antilles subduction zone

Author(s) :

Marcaillou, Boris [Auteur]
Géoazur [GEOAZUR 7329]
Klingelhoefer, Frauke [Auteur]
Institut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
Laurencin, Muriel [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Lebrun, Jean-Frédéric [Auteur]
Université des Antilles (Pôle Guadeloupe)
Géosciences Montpellier
Laigle, Mireille [Auteur]
Géoazur [GEOAZUR 7329]
Lallemand, Serge [Auteur]
Géosciences Montpellier
Schenini, Laure [Auteur]
Géoazur [GEOAZUR 7329]
Gay, Aurélien [Auteur]
Géosciences Montpellier
Boucard, Milton [Auteur]
Géosciences Montpellier
Ezenwaka, Kingsley [Auteur]
Géoazur [GEOAZUR 7329]
Graindorge, David [Auteur]
Laboratoire Géosciences Océan [LGO]

Journal title :

Communications Earth & Environment

Pages :

203

Publisher :

Springer Nature

Publication date :

2021

ISSN :

2662-4435

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre/Tectonique

English abstract : [en]

Oceanic crust formed at slow-spreading ridges is currently subducted in only a few places on Earth and the tectonic and seismogenic imprint of the slow-spreading process is poorly understood. Here we present seismic and ...
Show more >Oceanic crust formed at slow-spreading ridges is currently subducted in only a few places on Earth and the tectonic and seismogenic imprint of the slow-spreading process is poorly understood. Here we present seismic and bathymetric data from the Northeastern Lesser Antilles Subduction Zone where thick sediments enable seismic imaging to greater depths than in the ocean basins. This dataset highlights a pervasive tectonic fabric characterized by closely spaced sequences of convex-up Ridgeward-Dipping Reflectors, which extend down to about 15 km depth with a 15-to-40° angle. We interpret these reflectors as discrete shear planes formed during the early stages of exhumation of magma-poor mantle rocks at an inside corner of a Mid-Atlantic Ridge fracture zone. Closer to the trench, plate bending could have reactivated this tectonic fabric and enabled deep fluid circulation and serpentinization of the basement rocks. This weak serpentinized basement likely explains the very low interplate seismic activity associated with the Barbuda-Anegada margin segment above.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL