|Title||Mesozoic rift to post-rift tectonostratigraphy of the Sverdrup Basin, Canadian Arctic|
|Author||Hadlari, T; Midwinter, D; Galloway, J M; Dewing, K; Durbano, A M|
|Source||Marine and Petroleum Geology vol. 76, 2016 p. 148-158, https://doi.org/10.1016/j.marpetgeo.2016.05.008|
|Alt Series||Earth Sciences Sector, Contribution Series 20160057|
|Media||paper; on-line; digital|
|NTS||39B; 39C; 39F; 39G; 49; 58B; 58C; 58F; 58G; 59; 68; 69; 78; 79; 88; 89; 98; 99; 340A; 340B; 340C; 340D; 340E; 340F; 560A; 560B; 560C; 560D; 560E; 560F|
|Area||Arctic Ocean; Canadian Arctic Archipelago|
|Lat/Long WENS||-130.0000 -70.0000 83.0000 72.0000|
|Subjects||tectonics; stratigraphy; geochronology; basin evolution; tectonic evolution; plate margins; rifting; subsidence; deposition; basin geometry; sedimentary facies; continental shelf; magmatism; bedrock
geology; lithology; sedimentary rocks; sandstones; mudstones; igneous rocks; crustal evolution; lithosphere; tectonic models; lithostratigraphy; radiometric dating; detrital minerals; zircon dates; stratigraphic correlations; tectonostratigraphic
zones; grabens; Sverdrup Basin; Heiberg Group; King Christian Formation; Jameson Bay Formation; Deer Bay Formation; Isachsen Formation; Christopher Formation; High Arctic Large Igneous Province (HALIP); Amerasia Basin; Phanerozoic; Mesozoic;
|Illustrations||geological sketch maps; geochronological charts; spectra; stratigraphic cross-sections; photographs; seismic sections; location maps; schematic diagrams|
|Program||Western Arctic Sverdrup Basin, GEM2: Geo-mapping for Energy and Minerals|
|Abstract||Jurassic-Cretaceous rift successions and basin geometries of the Sverdrup Basin are reconstructed from a review and integration of stratigraphy, igneous records, outcrop maps, and subsurface data. The
rift onset unconformity is in the Lower Jurassic portion of the Heiberg Group (approximately 200e190 Ma). Facies transgress from early syn-rift sandstones of the King Christian Formation to marine mudstones of the Jameson Bay Formation. The syn-rift
succession of marine mudstones in the basin centre, Jameson Bay to Deer Bay formations, ranges from Early Jurassic (Pleinsbachian) to Early Cretaceous (Valanginian). Early post-rift deposits of the lower Isachsen Formation are truncated by the
sub-Hauterivian unconformity, which is interpreted as a break up unconformity at approximately 135e130 Ma. Cessation of rift subsidence allowed for late post-rift sandstone deposits of the Isachsen Formation to be distributed across the entire basin.
Marine deposition to form mudstone of the Christopher Formation throughout the Canadian Arctic Islands and outside of the rift basin records establishment of a broad marine shelf during post-rift thermal subsidence at the start of a passive margin
stage. The onset of the High Arctic Large Igneous Province at approximately 130 Ma appears to coincide with the breakup unconformity, and it is quite typical that magma-poor rifted margins have mainly post-rift igneous rocks. We extend the magma-poor
characterization where rifting is driven by lithospheric extension, to speculatively consider that the records from Sverdrup Basin are consistent with tectonic models of retro-arc extension and intra-continental rifting that have previously been
proposed for the Amerasia Basin under the Arctic Ocean.|
|Summary||(Plain Language Summary, not published)|
This contribution describes the overall shape of the Sverdrup Basin and incorporates new stratigraphic studies by GSC geologists under the GEM program.
This work is a building block intended to be used by GSC research teams over the course of GEM2.