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TitreEarly partitioning of Quebec: microcontinent formation in the Paleoproterozoic
AuteurSt-Onge, M R; Scott, D J; Lucas, S B
SourceGeology v. 28, no. 4, 2000 p. 323-326, https://doi.org/10.1130/0091-7613(2000)28<323:epoqmf>2.0.co;2
Année2000
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 1999047
ÉditeurGeological Society of America
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1130/0091-7613(2000)28<323:epoqmf>2.0.co;2
Mediapapier; en ligne; numérique
Formatspdf
ProvinceQuébec; Nunavut
SNRC23M; 23N; 23O; 23P; 24; 25; 26A; 26B; 26C; 26D; 33M; 33N; 33O; 33P; 34; 35; 36A; 36B; 36C; 36D; 43P; 44A; 44H; 44I; 44P; 45A; 45H; 45I; 45P; 46A
Lat/Long OENS -82.0000 -64.0000 65.0000 54.0000
SujetsArchéen; régions orogéniques; orogénies; magmatisme; marges continentales; zones tectonostratigraphiques; décrochement horizontal; évolution tectonique; modèles tectoniques; cadre tectonique; Orogène Trans-Hudsonien; Craton de Supérieur; Formation de Menihek ; Formation de Wishart ; Formation de Ruth ; Formation de Sokoman ; Formation de Denault ; Sous-Groupe de Swampy Bay; Formation de Bacchus ; Sous-Groupe de Pistolet; Sous-Groupe de Seward; Groupe de Belcher ; Formation d'Omarolluk ; Formation de Flaherty ; Formation d'Eskimo ; Groupe de Richmond Gulf ; tectonique; stratigraphie; Protérozoïque; Précambrien
Illustrationssketch maps; stratigraphic sections
Résumé(disponible en anglais seulement)
The distribution of allochthonous versus parautochthonous carbonate platforms, combined with the timing of initial continental-rift magmatism versus the timing of subsequent rifting of the continental margin, provides tectonostratigraphic evidence for the formation and isolation of the oldest documented microcontinent, perhaps as a consequence of the impingement of a mantle plume onto a cratonic margin during the Paleoproterozoic. Initial rifting of the Archean nucleus of North America in eastern Canada is constrained to have been diachronous between 2.17 and 2.03 Ga. Renewed rifting of a segment of the continental margin, 292 to 120 m.y. later, was accompanied by the emplacement of ultramafic layered sills, the accumulation of komatiitic and alkalic basalts, the deposition of banded iron formations and the isolation of a microcontinent and its 1.93 Ga continental shelf succession (subsequently accreted to the telescoped continental margin during collisional orogenesis).
GEOSCAN ID210460