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TitreNew U-Pb geochronology from the Blake River Group, Abitibi Subprovince,Québec: Implications for geological interpretations and base metal exploration
AuteurMcNicoll, V; Goutier, J; Dubé, B; Mercier-Langevin, P; Ross, P; Dion, C; Monecke, T; Percival, J
SourceAssociation géologique du Canada-Association minéralogique du Canada, Réunion annuelle, Programme et résumés vol. 34, 2011 p. 139
LiensOnline - En ligne
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130571
Éditeurgac
Réunion2011 GAC-MAC-SEG-SGA Joint Annual Meeting; Ottawa; CA; mai 25-27, 2011
Documentpublication en série
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
ProvinceQuébec; Ontario
SNRC32D
Lat/Long OENS -80.0000 -78.5000 49.0000 48.0000
Sujetsdatations au uranium-plomb; roches volcaniques; gisements minéraux; minéralisation; Archéen; roches volcaniques; roches plutoniques; gîtes volcanogènes; gîtes sulfureux; Groupe de Blake River ; Ceinture d'Abitibi Greenstone ; Mine Horne ; Mine Millenbach ; Mine Amulet ; Formation de Bousquet ; géochronologie; minéraux métalliques; Précambrien
ProgrammeÉtude des gîtes d'or, Initiative géoscientifique ciblée (IGC-4)
ProgrammeÉtude des gîtes d'or, Initiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
The 2704-2695 Ma Blake River Group forms part of the Abitibi Subprovince of the Superior Province. The submarine volcanic rocks of this group are host to a number of volcanogenic massive sulphide (VMS) deposits, including several world-class deposits. Nineteen new high precision U-Pb ages contribute to a high level of understanding of the time evolution of the Blake River Group and demonstrate that VMS deposits formed throughout the protracted volcanic evolution of the entire group. Important mineralizing events in the Blake River Group occur on the order of 2 m.y. and appear to be related to major magmatic episodes. The Blake River Group is host to the two largest Archean Au-rich VMS deposits (Horne and LaRonde Penna) and the large Bouchard- Hebert/Mobrun VMS deposit. These large deposits were formed during three distinct time periods (2702 Ma Horne-Quemont, 2698-2697 Ma LaRonde-Bousquet, and 2696 Ma Bouchard- Hebert/Mobrun). Age constraints on the timing of various mineralizing events contribute to better understanding the geometry of the Blake River Group and its geologic and metallogenic evolution. Recognizing the specific time-stratigraphic intervals favourable for mineralization and the associated geological settings are important aspects of future exploration models for these polymetallic deposits in the Blake River Group.
GEOSCAN ID296046