Titre :

From orogenic collapse to rifting: A case study of the northern Porcupine Basin, offshore Ireland

Auteur(s) :

Bulois, Cédric [Auteur]
Laboratoire de géologie de l'ENS [LGENS]
Pubellier, Manuel [Auteur]
Laboratoire de géologie de l'ENS [LGENS]
Chamot-Rooke, Nicolas [Auteur]
Laboratoire de géologie de l'ENS [LGENS]
Watremez, Louise [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]

Titre de la revue :

Journal of Structural Geology

Pagination :

139-162

Éditeur :

Elsevier

Date de publication :

2018-09

ISSN :

0191-8141

Discipline(s) HAL :

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

Résumé en anglais : [en]

Offshore Ireland, the North Atlantic opening is generally interpreted as successive, 10-to-15-Myr-long, rifting events during the Mesozoic. However, their interaction is poorly documented in terms of structural inheritance ...
Lire la suite >Offshore Ireland, the North Atlantic opening is generally interpreted as successive, 10-to-15-Myr-long, rifting events during the Mesozoic. However, their interaction is poorly documented in terms of structural inheritance and fault reactivation. From extensive seismic and well data in the northern Porcupine Basin, we show that extension actually evolved over an abnormal period of ca. 220 Myrs with overlapping tectonic stages that, all together, reflect the Irish Atlantic Margin construction from the Palaeozoic. During the Carboniferous, extension initiated throughout the Variscan and Caledonian thickened crusts and controlled the deposition of generally slightly-tilted, continental clastics. Two subsequent rifting events, during the Triassic-Lower Jurassic and Upper-Jurassic-Lower Cretaceous, controlled shallow-to-deep marine sedi-mentation in separated sub-basins that progressively widen and connect once extension localised along bounding faults. We propose that extensional tectonics, first controlled by a general orogenic collapse reflecting an early stage of stretching, is then followed by several rifting periods that ultimately evolved toward the hyper-thinning of the margin and shaped an aborted rift propagator. This evolution is due to pre-existing orogenic-related structures and boundary conditions variations. Such a continuum of deformation, although pulsed, implies varying structural interactions of crustal scale that are often recorded in syn-tectonic sediments.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

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

Source :

Harvested from HAL