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- W1978451333 abstract "Northwest-oriented features have been recognized for many years as fundamental components of the geology of the northwestern European continental shelves. Similarly oriented lineations and faults have been mapped throughout southwestern Britain, western France and across the English Channel. On land in Europe, similar trends are identified as far east as the Urals. Features of similar orientation, extending over a broad area on the North American continental shelf, have recently been identified from geophysical trends. On land in eastern Canada NW-SE faults have been mapped geologically and detected using geophysical and remote sensing data. A Mercator projection map on which the Atlantic Ocean has been restored to its pre-Mesozoic configuration, i.e. before the initiation of the most recent opening of the North Atlantic Ocean, shows that the features are similarly oriented.Although some of the trends showing this direction may be younger, the geological data from both sides of the Atlantic Ocean suggest that the event that led to the formation of these NW-SE features post-dated the Variscan orogeny and may have been associated with the collision between Gondwana and Laurasia. The geometric patterns of the features interpreted as associated with the collision are consistent with patterns produced by a simple physical sandbox model of indentation with a rigid confinement to the west and a small lateral confinement to the east. This configuration is similar to that expected of Gondwana and Laurasia during the late Paleozoic. Faults considered younger than this collision may represent tectonic rejuvenations associated with the initiation of the opening of the North Atlantic Ocean.RESUMEL'orientation obscrvee du nord-est vers le sud-est des formations rocheuses est reconnue depuis de nombreuses annees comme une caracteristique geologique fondamentale des plateaux continentaux du nord-ouest de l'Europe. Des structures lineaires et des failles d'orientation similaires ont ete repertoriees dans tout le sud-ouest de l'Angleterre, dans I'ouest de la France et a travers la Manche. Sur le continent europeen, des tendances analogues ont pu fitre observees aussi loin a l'est que dans la chaine de l''Oural. Ces caracterstiques orientees qui recouvrent une vaste region du plateau continental de l'Amerique du Nord ont recemment ete observees a partir de tendances geophysiques. Dans l'Est canadien, des failles orientees NO-SE ont ete portees sur des cartes geologiques et deectees a l'aid.e de donnees geophysiques et de teleledetection. Ces caracteristiques observees ont ete portees sur une carte a projection de Mercator oo figure l'ocean Atlantique dans sa configuration d'origine pendant l'ere pre-mesozoTque, soit avant que ne s'amorce rouverture la plus recente de l'Atlantique Nord. Ces caracteristiques nsproduisent la meme orientation lorsqu'elles sont portees ainsi sur la carte.Bien que certaines des tendances qui signalent cette orientation semblent d'apparition plus recente, les donnees geologiques des deux cotes de l'Atlantique portent a croire que le phenomene qui a mene la creation de ces lineations NO-SE est survenu apres l'orogenese de varisque et peut fltre relie a l'hypercollision survenue entre la Gondwanie et la Laurasie. Les formes geometriques de ces lineations interpretees en relation avec la collision sont du meme type que eel les produites dans un modele d'echancrure geologique dans un simple carre de sable, celles-ci presentant un confinement rigide e l'ouest et un petit confinement lateral e Test. Il s'agit d'une configuration semblable a celle qui serait caracteristique de la Gondwanie et de la Laurasie. Les failles juges plus recentes et issues de cette collision pourraient etre attribuables a une regeneration tectonique qui a accompagne le debut de rouverture de l'Atlantique Nord.Traduit par la redaction" @default.
- W1978451333 created "2016-06-24" @default.
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- W1978451333 date "1999-10-01" @default.
- W1978451333 modified "2023-09-24" @default.
- W1978451333 title "NW-oriented features on both sides of the Atlantic Ocean: evidence for a Paleozoic collision that formed the Labrador-Biscay wrench fault zone?" @default.
- W1978451333 doi "https://doi.org/10.4138/2034" @default.
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