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TitreCretaceous-Paleogene invertebrate faunas from Bylot Island, Nunavut provide direct linkage with West Greenland stratigraphic sequences
AuteurHaggart, J W; Herrle, J O; Schröder-Adams, C J; Burden, E T
SourceGeological Association of Canada, Mineralogical Association of Canada, Joint Annual Meeting, 2012; Association géologique du Canada-Association minéralogique du Canada, Réunion annuelle, Programme et résumés vol. 35, 2012 p. 50-51
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110349
ÉditeurGeological Association of Canada and the Mineralogical Association of Canada (GAC MAC)
RéunionThe Geological Association of Canada (GAC) and the Mineralogical Association of Canada (MAC)Joint Annual Meeting; St. John's, NL; CA; mai 27-29, 2012
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC38B/13; 38B/14; 38B/15; 38B/16; 38C; 48D/08; 48D/09
Lat/Long OENS-81.0000 -76.0000 73.7500 72.7500
Sujetsfossiles; biostratigraphie; corrélations stratigraphiques; Paléogène; hydrocarbures; milieu sédimentaire; microfossiles; palynologie; études des isotopes stables; Danien; Maestrichtien; Radiolarie; Foraminifère; Formation d'Agatdal ; Formation d'Atane ; Formation de Kangilia ; stratigraphie; paléontologie; combustibles fossiles; Tertiaire; Crétacé
ProgrammeBassins sédimentaires de la baie de Baffin - Systèmes de pétrole dans l'Arctique canadien est (CAPSE), GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Cretaceous-Paleogene strata exposed on Bylot Island and the north coast of Baffin Island, northeast Nunavut, Canada, serve as reference stratigraphic successions for the Baffin Shelf, a region of significant petroleum resource interest. Coeval successions with demonstrated petroleum shows are known from offshore areas of West Greenland. Accurate correlation between these regions is thus of vital interest for petroleum exploration, as well as for interpreting the tectonic and depositional history of circum-Baffin Bay basins.
Cretaceous-Paleogene strata of Bylot Island accumulated in a variety of depositional environments, from fluvio-deltaic to deeper-water shelf settings. Strata show locally abundant sulfur which may be responsible for the poor preservation and low abundance of foraminiferal, calcareous nannofossil, and radiolarian microfossils; where present, foraminifera are of benthic agglutinated nature and indicate a deep water setting. Mollusks and other macroinvertebrate groups are also relatively uncommon in the strata and intrabasinal biostratigraphic correlation has thus relied primarily on palynology, principally dinoflagellates and pollen and spores. Although some palynological assemblages recognized in Bylot Island strata are also recognized on the Newfoundland and Labrador Shelf and the western
Canadian Arctic, direct correlation with the succession of West Greenland has not yet been fully established. Paleogene strata of Bylot Island contain the gastropods Fusinus sp., Nekewis sp., and cf. Levifusus and cf. Vanikoropsis, as well as the branching coral Faksephyllia sp., of Danian age; similar faunas are known from the Agatdal Formation of West Greenland. Stratigraphically lower strata of Bylot Island have produced sparse aporrhaid and nerinacean gastropods, indicating a Maastrichtian age and suggested correlation with
the Kangilia Formation of West Greenland. Stratigraphically still lower fossils from Bylot Island include turritellid and aporrhaid gastropods, as well as possible sphenoceramid bivalves, indicative of a probable Campanian age and suggesting correlation with the upper Atane and possibly Itilli formations of West Greenland. Oldest macroinvertebrate remains from Bylot Island include inoceramid bivalves assignable to a likely Albian-Cenomanian age, and their containing strata are thus correlative with the lower Atane Formation.
No stable isotope record spanning Late Cretaceous-Early Tertiary time presently exists for the Canadian Arctic region. Ongoing bulk stable organic carbon isotope studies of strata on Bylot Island will hopefully refine local correlations, improve correlation with other basins in the circum-Baffin Bay region, and provide a reference for paleoenvironmental change across the northern Baffin Bay region during the Late Cretaceous and Early Tertiary.