GEOSCAN, résultats de la recherche


TitreTectonostratigraphic evolution of the Labrador Margin, Atlantic Canada
AuteurDickie, K; Keen, C E; Williams, G L; Dehler, S A
SourceMarine and Petroleum Geology vol. 28, 2011 p. 1663-1675,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100322
ÉditeurElsevier BV
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
Lat/Long OENS-62.0000 -52.0000 58.0000 54.0000
Sujetsmarges continentales; marges continentales, atlantique; interpretations sismiques; levés sismiques marins; levés sismiques; paléoenvironnement; zones tectonostratigraphiques; biostratigraphie; discordances; crevasses; décrochement horizontal; présence de pétrole; ressources pétrolières; capacité de production d'hydrocarbures; stratigraphie; tectonique; géologie marine; combustibles fossiles; Mésozoïque; Crétacé
Illustrationslocation maps; stratigraphic columns; profiles
ProgrammeGéoscience en mer, Analyse de bassin et ressources géoscientifiques
Résumé(disponible en anglais seulement)
The Labrador continental margin provides a rich source of data with which to study the relationships between stratigraphy, tectonics and paleoenvironment. We have completed a regional seismic interpretation and integrated this with new biostratigraphic data, based on analyses of palynomorphs from wells in the Hopedale and Saglek Basins which occur on this margin. Our results are summarized in a tectonostratigraphic chart, which displays new and consistent age control for the major lithostratigraphic units and provides more precise evaluation of their depositional and paleoenvironmental history. We have identified and dated six regional unconformities in the wells and we can recognize several others on the seismic data. The older unconformities (Cretaceous) are related to the tectonics of rifting and seafloor spreading, and may delineate the onset of different stages of the rift process. In the Paleocene-Early Eocene, unconformity development was influenced by episodic volcanism due to the passage of the proto-Iceland hotspot to the north and to a major change in spreading direction in the Labrador Sea. Many of these unconformities are also identified in offshore southwest Greenland and the Grand Banks, suggesting widespread controlling mechanisms. During the post-seafloor spreading stage the effects of mass wasting and slumping, and of paleoenvironmental controls on the stratigraphy, were more pronounced. We discuss the petroleum potential of the Hopedale Basin in terms of the structures we see on the seismic data, and highlight the Bjarni Formation, which likely contains the most prospective source and reservoir rocks in this Basin.