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TitleEarly Triassic development of a foreland basin in the Canadian high Arctic: implications for a Pangean Rim of Fire
AuthorHadlari, T; Dewing, K; Matthews, W A; Alonso-Torres, D; Midwinter, D
SourceTectonophysics vol. 736, 2018 p. 75-84, https://doi.org/10.1016/j.tecto.2018.04.020
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20180047
PublisherElsevier
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html; xlsx
ProvinceNunavut
NTS49B; 49C; 49F; 49G; 59; 69; 79A; 79D; 79E; 79H; 340B/03; 340B/04; 340B/05; 340B/06; 340B/11; 340B/12; 340B/13; 340B/14; 340C/03; 340C/04; 340C/05; 340C/06; 340C/11; 340C/12; 340C/13; 340C/14; 560A; 560B; 560C; 560D
AreaCanadian Arctic Archipelago; Axel Heiberg Island; Griesbach Creek; Ellef Ringnes Island; King Christian Island; Cornwall Island; Graham Island; Buckingham Island
Lat/Long WENS-108.0000 -84.0000 82.0000 76.0000
Subjectstectonics; stratigraphy; geochronology; sedimentary basins; basin evolution; tectonic evolution; tectonic setting; plate margins; depositional history; volcanism; subsidence; magmatic arcs; orogenies; subduction; subduction zones; rifting; crustal uplift; tectonic models; modelling; detrital minerals; zircon; provenance; source areas; radiometric dating; uranium lead dating; mass spectrometer analysis; hafnium geochemistry; lithostratigraphy; tectonostratigraphic zones; bedrock geology; lithology; sedimentary rocks; sandstones; mudstones; shales; igneous rocks; volcanic rocks; volcanic ash; bentonite; stratigraphic correlations; Sverdrup Basin; Pangea; Pangean Rim of Fire; Laurentia; Awingak Formation; Heiberg Group; Heiberg Formation; King Christian Formation; MacLean Formation; Skybattle Formation; Barrow Formation; Pat Bay Formation; Hoyle Formation; Murray Harbour Formation; Roche Point Formation; Blind Fiord Formation; Bjorne Formation; Lindstrom Formation; Trold Fiord Formation; Degerböls Formation; Yukon-Tanana Terrane; exhumation; supercontinent breakups; detrital zircon; foreland basins; extension; Phanerozoic; Mesozoic; Triassic; Paleozoic; Permian
Illustrationsgeoscientific sketch maps; location maps; stratigraphic charts; stratigraphic sections; graphs; tables; photographs; photomicrographs; stratigraphic cross-sections
ProgramWestern Arctic, Pearya Terrane, North Ellesmere, GEM2: Geo-mapping for Energy and Minerals
AbstractFollowing the amalgamation of Laurasia and Gondwana to form Pangea, some Triassic tectonic models show an encircling arc system called the "Pangean Rim of Fire". Here we show that the stratigraphy and Early Triassic detrital zircon provenance of the Sverdrup Basin in the Canadian Arctic is most consistent with deposition in a retro-arc foreland basin. Late Permian and Early Triassic volcanism was accompanied by relatively high rates of subsidence leading to a starved basin with volcanic input from a magmatic arc to the northwest. The mostly starved basin persisted through the Middle and Late Triassic with nearly continuous input of volcanic ash recorded as bentonites on the northwestern edge of the basin. In the latest Triassic it is interpreted that decreasing subsidence and a significant influx of sand-grade sediment when the arc was exhumed led to filling of the basin at the end of an orogenic cycle. Combined with other hints of Early Triassic arc activity along the western margin of Laurentia we propose that the Pangean Rim of Fire configuration spanned the entire Triassic. This proposed configuration represents the ring of external subduction zones that some models suggest are necessary for the breakup of supercontinents such as Pangea.
Summary(Plain Language Summary, not published)
New data from GEM2 field-based research are used to determine the causal mechanism for why the Sverdrup Basin in the High Arctic formed in the Permian-Triassic. We re-interpret the Sverdrup as a foreland basin that formed behind a magmatic arc much like the modern day Andes.
GEOSCAN ID308239