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TitreSilurian flysch successions of Ellesmere Island, Arctic Canada, and their significance to northern Caledonian palaeogeography and tectonics
AuteurBeranek, L P; Pease, V; Hadlari, T; Dewing, K
SourceJournal of the Geological Society vol. 172, 2015 p. 201-212, https://doi.org/10.1144/jgs2014-027
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140233
ÉditeurGeological Society of London
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1144/jgs2014-027
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNunavut
SNRC39G/09; 39G/10; 39G/11; 39G/12; 39G/13; 39G/14; 39G/15; 39G/16; 49G/09; 49G/10; 49G/11; 49G/12; 49G/13; 49G/14; 49G/15; 49G/16; 49H/09; 49H/10; 49H/11; 49H/12; 49H/13; 49H/14; 49H/15; 49H/16; 59H/09; 59H/10; 59H/11; 59H/12; 59H/13; 59H/14; 59H/15; 59H/16; 120C; 120D/03; 120D/04; 120D/05; 120D/06; 120D/11; 120D/12; 120D/13; 120D/14; 120E/03; 120E/04; 120E/05; 120E/06; 120E/11; 120E/12; 120E/13; 120E/14; 120F; 120G; 120H/03; 120H/04; 120H/05; 120H/06; 120H/11; 120H/12; 120H/13; 120H/14; 340A/03; 340A/04; 340A/05; 340A/06; 340A/11; 340A/12; 340A/13; 340A/14; 340B; 340C; 340D; 340E; 340F; 340H/01; 340H/02; 340H/03; 340H/04; 560A/01; 560A/02; 560A/07; 560A/08; 560A/09; 560A/10; 560A/15; 560A/16; 560D/01; 560D/02; 560D/07; 560D/08; 560D/09; 560D/10; 560D/15; 560D/16; 560E/01
Lat/Long OENS -92.0000 -60.0000 83.2500 79.5000
Sujetsdatations au uranium-plomb; datation au uranium-plomb; flysch; zircon; datations au zircon; antécédents tectoniques; interprétations tectoniques; tectonique de plaques; bassins sédimentaires; bassins de flysch; orogénies; structures des plis; plis; pétrologie du sediment; géochronologie; tectonique; géologie structurale; Paléozoïque; Silurien
Illustrationslocation maps; geologic maps; graphs; cross-sections, stratigraphic; sketch maps
ProgrammeLIP de l'haut-Arctique de l'ouest de l'Arctique, GEM2 : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Detrital zircon provenance studies of Silurian flysch units that underlie the Hazen and Clements Markham fold belts of Ellesmere Island, Arctic Canada, were conducted to evaluate models for northern Caledonian palaeogeography and tectonics. Llandovery flysch was deposited along an active plate margin and yields detrital zircons that require northern derivation from the adjacent Pearya terrane. If Pearya originated near Svalbard and NE Greenland, it was transported by strike-slip faults to Ellesmere Island by the Early Silurian. Wenlock to Ludlow turbidites yield Palaeozoic-Archaean detrital zircons with dominant age-groupings c. 650, 970, 1150, 1450 and 1650 Ma. These turbidite systems did not fill a flexural foreland basin in front of the East Greenland Caledonides, but rather an east-west-trending trough that was probably related to sinistral strike-slip faulting along the northern Laurentian margin. The data support provenance connections with the Svalbard Caledonides, especially Baltican-affinity rocks of SW Spitsbergen that were proximal to NE Greenland during the Baltica-Laurentia collision. Pridoli flysch has sources that include Pearya, the East Greenland Caledonides and the Canadian Shield. Devonian-Carboniferous molasse in Arctic Canada has analogous detrital zircon signatures, which implies recycling of Silurian flysch during mid-Palaeozoic (Ellesmerian) collisional tectonism or that some collisional blocks were of similar Baltican-Laurentian crustal affinities.
Résumé(Résumé en langage clair et simple, non publié)
Le présent manuscrit donne suite à un article publié par MM. Hadlari (Ph.D.) et Dewing (Ph.D.) sur l'origine du terrane de Pearya, à l'extrémité nord de l'île d'Ellesmere. Les zircons détritiques prélevés dans des dépôts de grès et des dépôts volcanoclastiques ont été datés à l'aide de la géochronologie U Pb. Les âges obtenus indiquent que l'arc volcanique et les roches d'Amérique du Nord ont été liés il y a au moins 430 Ma, comme l'avait prévu la récente recherche de la CGC menée dans le cadre du programme GEM-1.
GEOSCAN ID295269