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TitreFar north geomapping initiative: New U-Pb geochronological results from the Seal River region, northeastern Manitoba (parts of NTS 54L, M, 64I, P)
AuteurRayner, N
SourceManitoba Department of Energy and Mines, Geological Services, Report of Activities 2010, 2010 p. 23-35
Année2010
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100221
Documentpublication en série
Lang.anglais
Mediapapier
ProvinceManitoba
SNRC54L/11; 54L/12; 54L/13; 54L/14; 54L/15; 54M; 64I/09; 64I/10; 64I/11; 64I/14; 64I/15; 64I/16; 64P/01; 64P/02; 64P/03; 64P/06; 64P/07; 64P/08; 64P/09; 64P/10; 64P/16
Lat/Long OENS-97.5000 -94.5000 60.0000 58.5000
Sujetsdatations radiométriques; datation radiométrique; datation au uranium-plomb; roches ignées; roches plutoniques; roches volcaniques; roches sédimentaires; Archéen; gneiss; granodiorites; Complexe de Seal River ; géochronologie; Précambrien
Illustrationslocation maps; Concordia diagrams; plots
ProgrammeGisements polymétalliques - nord-est du Manitoba, GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
The Manitoba Geological Survey's Far North Geomapping Initiative includes collaboration with the Geochronology Laboratory of the Geological Survey of Canada under the Geo-mapping for Energy and Minerals (GEM) program. As part of this collaboration, this report presents new U-Pb zircon ages from 16 plutonic, volcanic and sedimentary rocks from the Seal River region in far northeast Manitoba. The U-Pb geochronological results presented here and interpreted in the accompanying report (Anderson et al., GS-1, this volume) record a protracted and complex geological history. Mesoarchean (2901 ±5 Ma; 2860 ±4 Ma) basement rocks along with remnants of older, Paleoarchean (3.5 Ga) material have been identified in a discrete crustal block (the Seal River Complex) in the central portion of the map area. Emplacement of a voluminous felsic plutonic suite occurred in the Neoarchean between 2570 Ma and 2550 Ma and coincides in time with the crystallization age of a rhyolite flow (2570 ±3 Ma) overlying the Seal River Complex. Of particular importance for regional tectonic correlations is a new chronology of four sedimentary sequences. Uraniumlead zircon ages indicate a Neoarchean depositional age (<2.70 Ga; >2.57 Ga) for the fluvial-alluvial sequence 1, which includes mineralized quartz pebble conglomerate. Provenance profiles also provide maximum depositional ages for overlying marginal marine to marine siliciclastic rocks of sequence 2 (<2.5 Ga), sequence 3 (<1.98 Ga) and sequence 4 (<1.88 Ga), and thus provide important new constraints for regional stratigraphic correlations and paleotectonic reconstructions.
GEOSCAN ID286329