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TitreStructure of a Paleoproterozoic continent-continent collision zone: a LITHOPROBE seismic reflection profile across the Trans-Hudson Orogen, Canada
AuteurLewry, J F; Hajnal, Z; Green, A; Lucas, S B; White, D; Stauffer, M R; Ashton, K E; Weber, W; Clowes, R
SourceTectonophysics vol. 232, 1994 p. 143-160, https://doi.org/10.1016/0040-1951(94)90081-7
Année1994
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 1999100
ÉditeurElsevier BV
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/0040-1951(94)90081-7
Mediapapier; en ligne; numérique
Formatspdf
ProvinceManitoba; Saskatchewan
SNRC53E/04; 53E/05; 53E/12; 53E/13; 53L/05; 53L/12; 53L/13; 53M/05; 53M/12; 53M/13; 54D/04; 54D/05; 54D/12; 54D/13; 54E/04; 54E/05; 54E/12; 54E/13; 54L/04; 54L/05; 54L/12; 54L/13; 63E; 63F; 63G; 63H; 63I; 63J; 63K; 63L; 63M; 63N; 63O; 63P; 64A; 64B; 64C; 64D; 64E; 64F; 64G; 64H; 64I; 64J; 64K; 64L; 73F; 73G; 73H; 73I; 73J; 73K; 73N; 73O; 73P; 74A; 74B; 74C; 74F; 74G; 74H; 74I; 74J; 74K
Lat/Long OENS-110.0000 -95.5000 59.0000 53.0000
Sujetscroûte continentale; levés de reflexion sismiques; profils sismiques; interprétations tectoniques; évolution tectonique; épaisseur de la croûte; imbrication; Archéen; lithosphère; discontinuité de Mohorovicic; subduction; déformation; Orogène Trans-Hudsonien; Zone de Reindeer ; Batholite de Wathaman ; Craton d'Hearne ; Ceinture de Thompson ; Craton de Northwest Superior ; tectonique; géologie structurale; géophysique; Protérozoïque
Illustrationscross-sections; geophysical sections
Résumé(disponible en anglais seulement)
An ~ 800 km reflection seismic profile across the Trans-Hudson Orogen, northern Saskatchewan and Manitoba, images crustal-scale tectonic imbrication in an unprecedented picture of Paleoproterozoic crustal accretion and continent-continent collisional tectonism. The profile is crudely symmetric about a crustal-scale culmination in the western part of an accreted juvenile collage (Reindeer Zone). Geologic and isotopic data suggest that this culmination is cored by microcontinental Archean basement. West of the culmination, highly reflective juvenile crustal elements dip westward into the lower crust, beneath the Wathaman Batholith and Archean continental crust of Hearne craton. To the east, strong reflections in the juvenile Reindeer Zone crust and reworked Archean foreland of the Thompson belt have eastward dips persisting into the middle crust and extending beneath the Superior craton. A continuous reflection Moho, well-defined for > 500 km in the western part of the profile, shows marked relief (12- > 15 s), including a prominent root below the crustal culmination. These imaged structures give evidence of substantial crustal shortening and thickening via large-scale imbrication consistent with collisional orogeny. W-dipping structures below the Wathaman Batholith and reworked Hearne craton may reflect subduction polarity in this part of the orogen. However, geological evidence suggests that E-dipping structures below Superior craton are largely related to late/post-collisional deformation, rather than to prior oceanic subduction polarity.
GEOSCAN ID210667