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TitleGeochronology and constraints on the Permian and Triassic northern source region of the Sverdrup Basin of Canadian Arctic Islands
AuthorAnfinson, A; Embry, A; Stockli, D
SourceTectonophysics vol. 691, pt. A, 2016 p. 206-219,
Alt SeriesEarth Sciences Sector, Contribution Series 20160003
Mediapaper; on-line; digital
File formatpdf
NTS120E; 120F; 340F; 340E; 340C; 340D; 340A; 340B; 560A; 560B; 560C; 69; 59; 49; 79; 89; 99; 68G; 68H; 78G; 78H; 88G; 88H; 88E
AreaSverdrup Basin
Lat/Long WENS-123.0000 -60.0000 83.8333 76.8333
Subjectsgeneral geology; geochronology; uranium lead dates; uranium lead dating; detrital minerals; zircon dates; Permian; Triassic; Devonian
Illustrationslocation maps; stratigraphic columns; stratigraphic cross-sections; graphs; histograms; diagrams
ProgramWestern Arctic Sverdrup Basin, GEM2: Geo-mapping for Energy and Minerals
AbstractDetrital 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.
Summary(Plain Language Summary, not published)
The Sverdrup Basin is a large, petroleum-bearing sedimentary basin in Arctic Canada. Studies of minerals in some of the sediment in the basin indicates that the sediments were in part derived from the Ural Mountains which were located some 1500 km away from the basin.