| Titre | New field and geochronological results for the Osik-Atik-Footprint lakes area, Manitoba (NTS 63O13, 14, 15, 64B2, 3) |
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| Auteur | 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  Accès ouvert |
| Liens | Online - En ligne
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| Liens | Supplementary Data - Données supplémentaires
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| Image |  |
| Année | 2007 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20070318 |
| Document | publication en série |
| Lang. | anglais |
| Media | papier; CD-ROM |
| Formats | pdf; xls |
| Province | Manitoba |
| SNRC | 63O/13; 63O/14; 63O/15; 64B/02; 64B/03 |
| Région | Osik Lake; Atik Lake; Footprint Lake; Nelson House; Notigi; Wapawsik; Macheewin Lake |
| Lat/Long OENS | -99.5000 -98.6667 56.0833 55.7500 |
| Lat/Long OENS | -99.5000 -98.6667 56.0833 55.7500 |
| Sujets | Archéen; 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 |
| Illustrations | croquis cartographiques; photographies; diagrammes Concordia |
| Programme | Initiative géoscientifique ciblée (IGC-3), 2005-2010
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| Diffusé | 2007 01 01 |
| 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 ID | 224356 |
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