Pervasive detachment faults within the ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Pervasive detachment faults within the slow spreading oceanic crust at the poorly coupled Antilles subduction zone
Auteur(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]
Géosciences Montpellier
Université des Antilles (Pôle Guadeloupe)
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]
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]
Géosciences Montpellier
Université des Antilles (Pôle Guadeloupe)
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]
Titre de la revue :
Communications Earth & Environment
Pagination :
203
Éditeur :
Springer Nature
Date de publication :
2021
ISSN :
2662-4435
Discipline(s) HAL :
Planète et Univers [physics]/Sciences de la Terre/Tectonique
Résumé en anglais : [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 ...
Lire la suite >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.Lire moins >
Lire la suite >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.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
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- https://hal.archives-ouvertes.fr/hal-03360100/document
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- https://www.nature.com/articles/s43247-021-00269-6.pdf
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- https://hal.archives-ouvertes.fr/hal-03360100/document
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- https://hal.archives-ouvertes.fr/hal-03360100/document
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- Marcaillou-etal-NCEE-2021.pdf
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- s43247-021-00269-6.pdf
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