GEOSCAN, résultats de la recherche


TitreKimberlite trends in NW Canada
AuteurSnyder, D B; Lockhart, G D
SourceJournal of the Geological Society vol. 162, no. 5, 2005 p. 737-740,
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 2004015
ÉditeurGeological Society of London
Documentpublication en série
Mediapapier; en ligne; numérique
Formatshtml; pdf
ProvinceTerritoires du Nord-Ouest
SNRC75E; 75F; 75G; 75H; 75I; 75J; 75K; 75L; 75M; 75N; 75O; 75P; 76; 85F; 85G; 85H; 85I; 85J; 85K; 85N; 85O; 85P; 86
Lat/Long OENS-117.0000 -105.0000 68.0000 61.0000
Sujetskimberlites; diamant; gisements minéraux; craton; lithosphère; anisotropie; ondes transversales; méthodes sismiques; diamant; géologie économique; géophysique
Illustrationslocation maps; 3-D models; graphs
ProgrammePOLARIS - Portable Observatories for Lithospheric Analysis and Research Investigating Seismicity
Diffusé2005 09 01
Résumé(disponible en anglais seulement)
Kimberlite deposits attract much interest as the host rock for diamonds, but their eruption mechanisms and deep root structure remain poorly perceived. Independent geochronological and seismic shear-wave anisotropy studies in NW Canada near the world's newest diamond mines revealed an unexpected correlation in structural trends. Age of eruption grouped 36 kimberlites into linear clusters; forward modelling of shear-wave delays indicated two distinct layers of seismic anisotropy with a boundary about 120 km deep. The similarity of inferred age and trend direction at surface and at depth indicates that these kimberlites erupted along lithospheric-scale fractures oriented by continental stress fields related to North American plate motions.