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TitreImaging Archaean-age whole mineral systems
AuteurSnyder, D B
SourcePrecambrian Research 2011 p. 1-8, https://doi.org/10.1016/j.precamres.2011.10.016
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110183
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.precamres.2011.10.016
Mediapapier; en ligne; numérique
Formatspdf
ProvinceOntario; Québec; Nunavut; Territoires du Nord-Ouest
SNRC75; 76; 85; 86; 42A
Lat/Long OENS-120.0000 -104.0000 68.0000 60.0000
Lat/Long OENS-82.0000 -80.0000 49.0000 48.0000
SujetsArchéen; manteau terrestre; analyses texturales; lithosphère; métasomatose; prospection sismique; caractéristiques structurales; Craton de Slave ; Bouclier Canadien; minéralogie; pétrologie ignée et métamorphique; Précambrien
Illustrationslocation maps; profiles
ProgrammeDiamands, GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Structural fabrics that cause seismic wave anisotropy within the lithospheric mantle of the Slave craton of northwest Canada are interpreted as fluid conduits that form a macroscopic-scale stockworks of metasomatised peridotite dykes within depleted harzburgitic mantle. These metasomatised peridotite conduits probably are composed of rocks such as pyroxenite or wehrlite and must occupy 10% of the mantle in order to explain this distinct anisotropy where it is present. Reduced mantle shear-wave speeds associated with these stockworks may prove diagnostic of their presence deep in the sub-continental lithospheric mantle. The former (and present?) fluid conduits have been hypothesized as source regions for diamonds and kimberlite magmas, and may also be metal-enriched regions. In order to form a whole mineral system, such stockworks of metasomatised mantle conduits must communicate with crustal conduits leading to near-surface mineral deposits. Seismic evidence for these conduits at all levels has been observed beneath a few major mining camps.
GEOSCAN ID289230