| Titre | Geology, hydrothermal alteration, and genesis of the world-class Canadian Malartic stockwork-disseminated Archean gold deposit, Abitibi, Quebec |
| Télécharger | Téléchargement (publication entière) |
| Auteur | De Souza, S; Dubé, B; McNicoll, V J; Dupuis, C; Mercier-Langevin, P; Creaser, R A; Kjarsgaard, I M |
| Source | Targeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration; par Dubé, B (éd.); Mercier-Langevin, P (éd.); Commission géologique
du Canada, Dossier public 7852, 2015 p. 113-126, https://doi.org/10.4095/296633 |
| Année | 2015 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/296633 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Dubé, B;
Mercier-Langevin, P; (2015). Targeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration, Commission géologique du Canada, Dossier public 7852 |
| Formats | pdf |
| Province | Québec |
| SNRC | 32D/03NE; 32D/06; 32D/07 |
| Lat/Long OENS | -79.5000 -78.5000 48.5000 48.1667 |
| Sujets | gisements minéraux hydrothermaux; altération hydrothermale; gîtes minéralogiques; gisements minéraux; potentiel minier; minéralisation; or; gîtes volcanogènes; sulfures; gîtes sulfureux; Archéen; genèse
des gîtes minéraux; Ceinture d'Abitibi Greenstone ; géologie économique; Précambrien; Protérozoïque |
| Illustrations | location maps; photographs; cross-sections; plots |
| Consultation | |
| Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre) |
| |
| Programme | Étude des gîtes d'or, Initiative géoscientifique ciblée (IGC-4) |
| Diffusé | 2015 06 11 |
| Résumé | (disponible en anglais seulement)
The Canadian Malartic Mine consists of an Archean low-grade bulk tonnage gold deposit (reserves of 10.7 Moz Au @ 0.97 g/t) hosted by clastic metasedimentary
rocks of the Pontiac Group and subalkaline porphyritic quartz monzodiorite and granodiorite located immediately south of the Larder Lake-Cadillac Fault Zone. The quartz monzodiorite and granodiorite yield syn-Timiskaming U-Pb zircon ages of 2677 and
2678 Ma, respectively. Gold mineralization is characterized by zones of quartz-carbonate vein stockwork and disseminated pyrite with a Au-Te-W-S-Bi-Ag}Pb}Mo metallic signature. These ore zones are dominantly oriented subparallel to the
northwest-striking S2 foliation and to the east-striking and south-dipping Sladen Fault, thus forming northwest-southeast and east-west mineralized trends. Molybdenite from highgrade ore yielded a Re-Os age of ca. 2664 Ma. In both the sedimentary
rocks and the quartz monzodiorite, the proximal and distal alteration zones are characterized by the presence of calcite and ferroan dolomite, respectively. In the sedimentary rocks, the ore zones show a wide distal biotite alteration halo with
proximal assemblages comprising albite and/or microcline. The quartz monzodiorite comprises a distal hematitic alteration zone that is overprinted by proximal microcline + albite + quartz replacement zones. This study suggests that at Canadian
Malartic deposit, the gold mineralization and its distribution are largely controlled by D2 faults, shear and high-strain zones developed in the hinge zone of F2 folds, and by the Sladen Fault. A ?2678 Ma syn-Timiskaming magmatic-hydrothermal early
phase of gold mineralization can be inferred by the metallic signature or the ore, the presence of mineralized stockworks, the potassic alteration (biotite/microcline), and association with porphyritic intrusions. The main characteristics of the
Canadian Malartic deposit is thus best explained by syn-D2 deformation gold (ca. 2670-2660 Ma) superimposed onto, or remobilized from, a gold-bearing magmatic/hydrothermal system related to Timiskaming-age porphyritic intrusions emplaced along a
major fertile fault zone. |
| GEOSCAN ID | 296633 |
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