| Title | New field and geochronological results for the Osik-Atik-Footprint lakes area, Manitoba (NTS 63O13, 14, 15, 64B2, 3) |
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| Author | Percival, J A; Rayner, N ; Growdon, M L; Whalen, J B; Zwanzig, H V |
| Source | Manitoba Science, Technology, Energy and Mines, Manitoba Geological Survey, Report of Activities 2007, 2007 p. 71-81  Open Access |
| Links | Online - En ligne
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| Links | Supplementary Data - Données supplémentaires
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| Image |  |
| Year | 2007 |
| Alt Series | Earth Sciences Sector, Contribution Series 20070318 |
| Document | serial |
| Lang. | English |
| Media | paper; CD-ROM |
| File format | pdf; xls |
| Province | Manitoba |
| NTS | 63O/13; 63O/14; 63O/15; 64B/02; 64B/03 |
| Area | Osik 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 |
| Subjects | geochronology; 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 |
| Illustrations | sketch maps; photographs; Concordia diagrams |
| Program | Targeted Geoscience Initiative (TGI-3), 2005-2010 |
| Released | 2007 01 01 |
| Abstract | 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 ID | 224356 |
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