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TitrePrecise U-Pb geochronology of the Matagami mining camp, Abitibi greenstone belt, Quebec: stratigraphic constraints and implications for volcanogenic massive sulfide exploration
AuteurRoss, P S; McNicoll, V J; Debreil, J A; Carr, P
SourceArchean volcanism, magmatism and ore deposits; par Mercier-Langevin, P (éd.); Hannington, M (éd.); Gibson, H (éd.); Houlé, M (éd.); Dubé, B (éd.); Monecke, T (éd.); Goutier, J (éd.); Economic geology and the bulletin of the Society of Economic Geologists vol. 109, no. 1, 2014 p. 89-101,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110053
ÉditeurSociety of Economic Geologists
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC32E/09; 32E/16; 32F/12; 32F/13
Lat/Long OENS -78.1833 -77.4344 49.8519 49.6083
Sujetsgîtes sulfureux; gîtes volcanogènes; datations au uranium-plomb; Archéen; datations au zircon; roches volcaniques felsiques; rhyolites; volcanisme; tufs volcaniques; datations radiométriques; analyses géochimiques; altération; corrélations stratigraphiques; Ceinture d'Abitibi Greenstone ; Groupe de Wabassee ; géochronologie; stratigraphie; minéraux métalliques; géochimie; Précambrien
IllustrationsU-Pb concordia diagrams; geological sketch maps
ProgrammeAbitibi IGC-3, Initiative géoscientifique ciblée (IGC-3), 2005-2010
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
ProgrammeÉtude des gîtes d'or, Initiative géoscientifique ciblée (IGC-4)
Diffusé2013 11 19
Résumé(disponible en anglais seulement)
The Matagami mining camp in the northern Abitibi greenstone belt of Canada contains 19 known Archean volcanogenic massive sulfide (VMS) deposits, 11 of which have collectively produced 46.5 Mt of zinc-rich ore to date. The VMS deposits occur in three NW-SE- to WNW-ESE-oriented trends called the north flank, the south flank, and the west camp, which are composed of a felsic to mafic volcanic sequence cut by mafic to intermediate, synvolcanic sills and dikes. In order to clarify stratigraphic relationships between the south flank and the west camp, and to constrain the temporal evolution of volcanic activity, six new high-precision U-Pb zircon ages have been obtained. These data show that the total duration of felsic volcanism in the south flank was no more than 2.5 m.y., with the rhyolites extruded in the following order: Watson Rhyolite (2725.9 ± 0.8 Ma), Bracemac Rhyolite (2725.8 ± 0.7 Ma), Dumagami Rhyolite at the Persévérance Mine (2725.4 ± 0.7 Ma), and Dumagami Rhyolite in the Orchan West VMS deposit area (2724.9 ± 0.7 Ma). A hiatus in effusive volcanism is represented by the Key Tuffite, an important marker horizon in the camp. The hiatus probably lasted on the order of 0.5 m.y. Significantly, the rhyolite from the footwall of the Caber VMS deposit in the west camp has an age of 2725.9 ± 1.2 Ma, identical to that of the Watson Rhyolite on the south flank.