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TitreGeochronologic constraints on the Permian-Triassic northern source region of the Sverdrup Basin, Canadian Arctic Islands
AuteurAnfinson, A; Embry, A; Stockli, D
SourceTectonophysics vol. 691, pt. A, 2016 p. 206-219, https://doi.org/10.1016/j.tecto.2016.02.041
Année2016
Séries alt.Secteur des sciences de la Terre, Contribution externe 20160003
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.tecto.2016.02.041
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNunavut
SNRC120E; 120F; 340F; 340E; 340C; 340D; 340A; 340B; 560A; 560B; 560C; 69; 59; 49; 79; 89; 99; 68G; 68H; 78G; 78H; 88G; 88H; 88E
Lat/Long OENS-123.0000 -60.0000 83.8333 76.8333
Sujetsdatations au uranium-plomb; datation au uranium-plomb; minéraux détritiques; datations au zircon; géologie générale; géochronologie; Permien; Trias; Dévonien
Illustrationslocation maps; stratigraphic columns; stratigraphic cross-sections; graphs; histograms; diagrams
ProgrammeBassin de Sverdrup de l'ouest de l'Arctique, GEM2 : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Detrital zircon U-Pb ages are used to provide constraints on the geologic evolution of the sediment source area(s) north of the Sverdrup Basin from the middle Permian to Late Triassic. Previous research on facies relationships and sediment progradation patterns of late Paleozoic and Triassic strata from the northern portion of Sverdrup Basin indicate that substantial sediment was derived fromnorth of the basin. Utilizing LA-ICP-MS U-Pb geochronology we have analyzed detrital zircons from these northerly derived strata, including sandstones of four Late Triassic (Norian) outcrop samples the northeast Sverdrup Basin, and two Triassic (Olenekian and Carnian) and two Permian (Roadian andWordian) samples from wells in the northwestern Sverdrup Basin. The samples from northwestern Sverdrup Basin contain abundant EarlyMississippian (350 Ma) to Early Ordovician (460 Ma), late Cambrian (500 Ma) to Cryogenian (650 Ma), and early Tonian (960 Ma) to Orosirian (2050 Ma) detrital zircon. The detrital zircon ages from these samples are similar to zircon age components of Late Devonian siliciclastic strata of the Franklinian foreland basin, and we suggest a similar source area, a low-lying landmass north of the Sverdrup basin, which included extensive Devonian foreland basin strata. The U-Pb detrital zircon age components of northerly-derived Late Triassic strata of northeastern Sverdrup Basin samples are similar to the Permian and Triassic Northwestern Sverdrup Samples, but also contain a substantial age component of Triassic (201 Ma) to Middle Mississippian (340 Ma) detrital zircons, suggesting an additional source area. The only well documented source for such zircons in the Arctic region is the Ural Orogen. Consequently, it is postulated that, in the Late Triassic, sediment was transported ~1500 km from the northern Urals, across the northern landmass, all the way to the shoreline of northeastern Sverdrup Basin.
Résumé(Résumé en langage clair et simple, non publié)
Le bassin de Sverdrup est un grand bassin sédimentaire pétrolifère situé dans l'Arctique canadien. Des études des minéraux dans une partie des sédiments du bassin indiquent que ces sédiments provenaient en partie des monts Oural qui se trouvaient à quelque 1500 km du bassin.
GEOSCAN ID297859