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TitreMagnetotelluric and teleseismic study across the Snowbird Tectonic Zone, Canadian Shield: a Neoarchean mantle suture?
AuteurJones, A G; Snyder, D B; Hanmer, S; Asudeh, I; White, D; Eaton, D; Clarke, G
SourceGeophysical Research Letters vol. 29, no. 17, 2002 p. 10 1-10 4, (Accès ouvert)
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 2001068
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC45D; 45E; 45L; 45M; 55; 65; 46D; 46E; 56A; 56B; 56C; 56D; 56E; 56F; 56G; 56H; 66A; 66B; 66C; 66D; 66E; 66F; 66G; 66H
Lat/Long OENS-104.0000 -86.0000 66.0000 60.0000
Sujetslevés magnétotelluriques; interprétations magnétotelluriques; levés magnétiques; levés géophysiques; séismologie; croûte continentale; manteau terrestre; Archéen; zones tectoniques; milieux tectoniques; Zone de Snowbird Tectonic ; Bouclier Canadien; Province de Western Churchill ; géophysique; tectonique; Précambrien
Illustrationssketch maps; resistivity models
Diffusé2002 09 06
Résumé(disponible en anglais seulement)
The Snowbird tectonic zone (STZ) is a fundamental boundary within Canada's Western Churchill Province, one of the world's largest yet poorly-known fragments of Archean crust. Geophysical data from a collocated magnetotelluric and teleseismic transect across the northeastern segment of the STZ provide an image of its subsurface geometry and indicate that it may have been previously mislocated. The model suggests that (1) the STZ has played a major role in the Neoarchean assembly and Paleoproterozoic reworking of the western Canadian Shield, (2) it was reactivated in a manner comparable to other crustal-scale features such as the Kapuskasing zone of the Superior Province, Canada, and the Redbank thrust of the Arunta block, central Australia, and (3) it juxtaposes mantle blocks with contrasting geophysical properties, revealing a lithosphere-scale overlap of the leading edges of the Rae and Hearne domains. The STZ thus records plate interactions in the Neoarchean comparable in scale with that of modern orogenic belts.