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TitreThe Paleoproterozoic Lalor Auriferous VMS Deposit, Snow Lake, Manitoba: Geology and Geochemistry of the Host Rocks and Hydrothermal Alteration Zones
AuteurCaté, A; Mercier-Langevin, P; Ross, P -S; Duff, S; Hannington, M; Dubé, B; Gagné, S
SourceManitoba Mining and Minerals Convention 2013, abstracts; 2013 p. 1
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140452
RéunionManitoba Mining and Minerals Convention 2013; Winnipeg; CA; Novembre 20-22, 2013
Documentpublication en série
Mediaen ligne; numérique
Lat/Long OENS-102.0000 -98.0000 56.0000 54.0000
Sujetsinterprétations géochimiques; gisements minéraux; assemblages de minéraux; minéralisation; or; gîtes volcanogènes; sulfures; déformation; métamorphisme; altération; altération hydrothermale; roches volcaniques; roches ignées; Ceinture de Flin Flon Greenstone ; géologie économique; géochimie; Précambrien; Protérozoïque
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
The Lalor auriferous Zn-Cu-Ag VMS is the largest deposit of the Snow Lake camp with reserves of 15.1 Mt at 7.2% Zn, 0.6% Cu, 1.9 g/t Au and 23.3 g/t Ag and resources of 12 Mt at 2.6% Zn, 0.9% Cu, 4.0 g/t Au and 27.8 g/t Ag. The deposit consists of highly-strained, stacked massive to semi-massive Zn-Cu±Au, Au-Cu and Au zones that are hosted in intensely and extensively altered volcanic and intrusive rocks. Most of the primary features in the footwall succession were obliterated by superimposed hydrothermal and tectonometamorphic events. However, using detailed mapping of mineral assemblages and structural fabrics in conjunction with extensive lithogeochemistry along a number of key sections makes it possible to precisely map the lithological units and the nature and distribution of hydrothermal alteration zones. Preliminary results indicate that several distinct mafic to felsic units of tholeiitic to calc-alkaline affinities are present in the host succession. These units were subjected to complex, multiphase hydrothermal events responsible for Mg-, Fe-, K- and Ca-bearing alterations and Ca metasomatism of varying intensity and distribution. The important gold endowment and the unique geologic characteristics of the Lalor deposit represent an ideal case to document and better understand gold enrichment processes in the VMS environment.