GEOSCAN, résultats de la recherche


TitreThe Archean Slave Craton (Northwest Territories, Canada) lithospheric structure experiment: preliminary results
AuteurCassidy, J F; Bostock, M G
SourceSeismological Research Letters vol. 68, 1997, 1 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090165
RéunionSeismological Society Of America Annual Meeting; US; 1997
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceTerritoires du Nord-Ouest
SujetsArchéen; structure de la croûte; croûte continentale; études de la croûte; lithosphère; évolution tectonique; milieux tectoniques; interprétations tectoniques; Craton de Slave ; tectonique; géologie structurale; Précambrien
Résumé(disponible en anglais seulement)
The discovery of diamondiferous kimberlites in northwestern Canada has prompted considerable interest in the nature, and extent of the upper mantle reservoir from whence the diamonds originated. A detailed study of the Archean Slave craton, Northwest Territories, Canada, was initiated in September, 1996. We are investigating the physical nature of the crust and upper mantle of the Slave craton using teleseismic methods, and data from a portable array of ten 3-component broadband seismographs, as well as the permanent Yellowknife seismic array. The analysis methods in this study include seismic tomography, receiver function analysis (for crustal and mantle discontinuities), and SKS and SKKS splitting. This study addresses several questions regarding the structure and evolution of the Slave craton; including lithosphere thickness variations; evidence for thermochemical erosion of the Slave lithosphere through plume interaction; and variations in the anisotropic fabric of the Archean Slave lithosphere. We give an overview of the experiment and present preliminary results, with emphasis on crustal thickness variations across the Slave craton based on receiver function analysis.