GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreUranium-lead geochronology of basement units in the Wuskwatim-Tullibee lakes area, northeastern Kisseynew Domain, Manitoba (NTS 63O)
AuteurRayner, N; Percival, J A
SourceManitoba Science, Technology, Energy and Mines, Manitoba Geological Survey, Report of Activities 2007, 2007 p. 82-90 (Accès ouvert)
LiensOnline - En ligne
LiensSupplementary Data - Données supplémentaires
Année2007
Séries alt.Secteur des sciences de la Terre, Contribution externe 20070346
Documentpublication en série
Lang.anglais
Mediapapier; CD-ROM
Formatspdf; xls
ProvinceManitoba
SNRC63O
Lat/Long OENS -99.5000 -98.0000 56.0000 55.2500
SujetsArchéen; géochronométrie; datation radiométrique; datation au uranium-plomb; datations au zircon; géologie du socle; roches ignées; roches intrusives; tonalites; roches métamorphiques; granulites; quartzites; charnockites; gneiss; roches sédimentaires métamorphosées; formations ferrifères; antécédents tectoniques; métamorphisme; potentiel minier; diamant; manteau terrestre; Province de Superior ; Orogène Trans-Hudsonien; Domaine de Kisseynew ; Groupe de Sickle ; Groupe de Burntwood ; Groupe d'Ospwagan ; Ceinture de Thompson Nickel ; géochronologie; stratigraphie; géologie structurale; Précambrien; Protérozoïque
Illustrationssketch maps; photographs; Concordia diagrams; histograms; photomicrographs
ProgrammeInitiative géoscientifique ciblée (IGC-3), 2005-2010
Résumé(disponible en anglais seulement)
This report presents U-Pb SHRIMP (Sensitive High Resolution Ion Microprobe) geochronological results from four high-grade samples of proposed Archean inliers within the Kisseynew Domain. A sample of tonalite from the Burntwood River near the Muskoseu River mouth is interpreted to have crystallized between 2.8-2.9 Ga and also contains inherited zircon up to 3.4 Ga in age. A third population of zircon from the tonalite indicates zircon growth between 2.5-2.55 Ga, speculatively associated with granulite-grade metamorphism. Immediately overlying the tonalite is quartzite interpreted to be in unconformable contact with the tonalite basement. The youngest reproducible detrital zircon is dated at 2.53 Ga with other detritus yielding minimum dates as old as 3.32 Ga. U-Pb results from a charnockite within the Wuskwatim Lake inlier are interpreted to indicate crystallization between 2.64-2.66 Ga with inheritance between 2.7 and 3.24 Ga. All three of these samples also record peak Trans-Hudson metamorphism with zircon growth at 1801 ± 13 Ma (tonalite), 1806 ± 5 Ma (quartzite) and 1804 ± 29 Ma (charnockite). Zircons recovered from a tonalite gneiss near iron formation west of Tullibee Lake do not preserve evidence of an Archean history. All but one zircon yield a weighted mean age of 1809 ± 3 Ma, identical within error to the Paleoproterozoic ages observed in the Archean samples. Only one zircon preserves a slightly older date of 1877 ± 22 Ma.
GEOSCAN ID224391