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TitleNew field and geochronological results for the Osik-Atik-Footprint lakes area, Manitoba (NTS 63O13, 14, 15, 64B2, 3)
AuthorPercival, J A; Rayner, NORCID logo; 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 Open Access logo Open Access
LinksOnline - En ligne
LinksSupplementary Data - Données supplémentaires
Alt SeriesEarth Sciences Sector, Contribution Series 20070318
Mediapaper; CD-ROM
File formatpdf; xls
NTS63O/13; 63O/14; 63O/15; 64B/02; 64B/03
AreaOsik Lake; Atik Lake; Footprint Lake; Nelson House; Notigi; Wapawsik; Macheewin Lake
Lat/Long WENS -99.5000 -98.6667 56.0833 55.7500
Lat/Long WENS -99.5000 -98.6667 56.0833 55.7500
Subjectsgeochronology; stratigraphy; structural geology; Archean; geochronometry; radiometric dating; uranium lead dating; tectonostratigraphic zones; structural analyses; structural trends; structural features; folds; foliation; intrusions; plutons; diabase dykes; bedrock geology; igneous rocks; intrusive rocks; granodiorites; porphyries; granites; tonalites; gabbros; pyroxenites; diorites; migmatites; pegmatites; metamorphic rocks; amphibolites; metasedimentary rocks; sandstones; iron formations; sedimentary rocks; arkoses; mafic rocks; ultramafic rocks; biotite; hornblende; quartz; silicates; feldspar; source rocks; mineral occurrences; nickel; glacial deposits; tills; till geochemistry; geochemical anomalies; mineral potential; gold; diamond; sulphide deposits; Superior Province; Trans-Hudson Orogen; Kisseynew Domain; Burntwood Group; Sickle Group; Thompson Nickel Belt; Precambrian; Proterozoic
Illustrationssketch maps; photographs; Concordia diagrams
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
Released2007 01 01
AbstractThe 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.

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