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TitreNew field and geochronological results for the Osik-Atik-Footprint lakes area, Manitoba (NTS 63O13, 14, 15, 64B2, 3)
AuteurPercival, J A; Rayner, N; Growdon, M L; Whalen, J B; Zwanzig, H V
SourceManitoba Science, Technology, Energy and Mines, Manitoba Geological Survey, Report of Activities 2007, 2007 p. 71-81 (Accès ouvert)
LiensOnline - En ligne
LiensSupplementary Data - Données supplémentaires
Année2007
Séries alt.Secteur des sciences de la Terre, Contribution externe 20070318
Documentpublication en série
Lang.anglais
Mediapapier; CD-ROM
Formatspdf; xls
ProvinceManitoba
SNRC63O/13; 63O/14; 63O/15; 64B/02; 64B/03
Lat/Long OENS -99.5000 -98.6667 56.0833 55.7500
Lat/Long OENS -99.5000 -98.6667 56.0833 55.7500
SujetsArchéen; géochronométrie; datation radiométrique; datation au uranium-plomb; zones tectonostratigraphiques; analyses structurales; tendances structurelles; caractéristiques structurales; plis; foliation; intrusions; plutons; filons de diabase; géologie du substratum rocheux; roches ignées; roches intrusives; granodiorites; porphyres; granites; tonalites; gabbros; pyroxénites; diorites; migmatites; pegmatites; roches métamorphiques; amphibolites; roches sédimentaires métamorphosées; grès; formations ferrifères; roches sédimentaires; arroses; roches mafiques; roches ultramafiques; biotite; hornblende; quartz; silicates; feldspath; roches mères; gîtes minéralogiques; nickel; dépôts glaciaires; tills; géochimie du till; anomalies géochimiques; potentiel minier; or; diamant; gîtes sulfureux; Province de Superior ; Orogène Trans-Hudsonien; Domaine de Kisseynew ; Groupe de Burntwood ; Groupe de Sickle ; Ceinture de Thompson Nickel ; géochronologie; stratigraphie; géologie structurale; Précambrien; Protérozoïque
Illustrationssketch maps; photographs; Concordia diagrams
ProgrammeInitiative géoscientifique ciblée (IGC-3), 2005-2010
Résumé(disponible en anglais seulement)
The oldest recognized units in the Osik-Atik- Footprint lakes are porphyritic granodiorites identified by sensitive high resolution ion microprobe (SHRIMP) U-Pb zircon ages on plutons at Atik Lake (1879±13 Ma) and Footprint Lake (1882±10 Ma). A supracrustal sequence containing quartz-rich sandstone and silicate-facies iron formation that borders a similar pluton at Wapisu Lake may be unconformable and underlie Burntwood Group (<1850 Ma) migmatites which make up most of the northeastern Kisseynew domain. At Osik Lake a hook-shaped body of homogeneous biotite tonalite is enveloped by a sheath of enderbite-quartz diorite-gabbro in structural contact with Burntwood migmatite. The tonalite contains at least one layered mafic-ultramafic body that may be the source of a nickel in till anomaly south of Osik Lake.
Structurally the area is characterized by a set of upright, gently northeast-plunging F3 folds that re-oriented a prominent S2 foliation developed in all rock types except late granites and pegmatites. The map pattern of an outlier of Sickle Group rocks north of Osik Lake may be the product of structural interference.
GEOSCAN ID224356