| Titre | Geology and gold enrichment at the Horne 5 Archean volcanogenic massive sulphide deposit, Abitibi greenstone belt, Quebec: a synthesis |
| Télécharger | Téléchargement (publication entière) |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Krushnisky, A; Mercier-Langevin, P; Ross, P -S; Goutier, J; Pilote, C; Bernier, C |
| Source | Targeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems; par Mercier-Langevin, P (éd.); Lawley, C J M (éd.); Castonguay, S (éd.); Commission géologique du Canada, Dossier public 8712, 2020 p. 31-44, https://doi.org/10.4095/323663  Accès ouvert |
| Année | 2020 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/323663 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Targeted
Geoscience Initiative 5: contributions to the understanding of Canadian gold systems |
| Formats | pdf |
| Province | Québec |
| SNRC | 32D/02; 32D/03; 32D/06; 32D/07 |
| Région | Rouyn-Noranda; Lake Osisko; Noranda Lake |
| Lat/Long OENS | -79.0531 -78.9933 48.2622 48.2361 |
| Sujets | Archéen; gisements minéraux; or; gîtes volcanogènes; gîtes sulfureux; argent; cuivre; zinc; prospection minière; directives d'exploration; genèse des minerais; minéralisation; contrôles des minerais;
enrichissement des minéraux; lentilles; géologie du substratum rocheux; lithologie; roches ignées; roches volcaniques; roches volcaniques felsiques; volcanoclastique; dacites; rhyodacites; clastes; tufs volcaniques; rhyolites; basaltes; andésites;
coulées de lave; brèches; roches intrusives; roches intrusives felsiques; roches intrusives mafiques; syenites; trondhjémites; tonalites; gabbros; diorites; diabases; caractéristiques structurales; failles; zones de failles; assemblages de minéraux;
pyrite; sphalérite; chalcopyrite; roches hôtes; porosité; perméabilité; zonation minéralogique; analyses thermiques; antécédents tectoniques; cadre tectonique; volcanisme; magmatisme; intrusions; filons rocheux; système hydrothermal; fluage;
altération hydrothermale; métamorphisme; déformation; foliation; ceintures de roche verte; remobilisation; recristallisation; décrochement horizontal; épaisseur de la croûte; lithogéochimie; analyses géochimiques; analyses des éléments en trace;
analyses des éléments majeurs; mines; analyses géométriques; analyse par spectromètre de masse; Ceinture d'Abitibi Greenstone ; Mine Quemont ; Faille d'Horne Creek ; géologie économique; tectonique; géochimie; minéralogie; Sciences et technologie;
Nature et environnement; Précambrien |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; modèles 3D; coupes transversales; graphiques; photographies; photomicrographies |
| Programme | Initiative géoscientifique ciblée (IGC-5) Systèmes minéralisés aurifères |
| Diffusé | 2020 06 11 |
| Résumé | (disponible en anglais seulement)
The Archean Horne 5 volcanogenic massive sulphide deposit contains total resources of 172.6 t Au (5.6 Moz; 112.7 Mt at 1.53 g/t Au) with significant Ag, Cu, and
Zn as by-products, one of the world's largest volcanogenic massive sulphide-associated gold resource. The deposit consists of stacked massive to semi-massive sulphide lenses that alternate with extensive zones of disseminated and stringer sulphides
enclosed within steeply dipping felsic volcaniclastic and shallow synvolcanic intrusive units of transitional to calc-alkaline magmatic affinity. Massive sulphide clasts are locally abundant in the volcaniclastic rocks at several stratigraphic
positions.
Gold is interpreted to be synvolcanic and is spatially associated with an assemblage primarily composed of pyrite, sphalerite, and chalcopyrite. Gold distribution in the Horne 5 deposit is largely controlled by the higher porosity and
permeability of select host lithologies (fragmental felsic units), which facilitate hydrothermal fluid circulation in the subseafloor environment. The presence of felsic synvolcanic intrusions and fine-grained tuffs overlying auriferous zones also
influences the distribution of the mineralization by acting as impermeable cap rocks to ascending fluids. Although part of the mineralization formed below the seafloor, the presence of massive sulphide clasts indicates that sulphide mounds also
accumulated on or close to the seafloor. The architecture of the Horne 5 deposit is characterized by along-strike zonation of two dominant metal assemblages, i.e., Zn±Au and Cu-Au, with the Cu-Au assemblage likely representing higher temperature
discharge sites. However, the original geometry of the deposit was modified when it was tilted and transposed along the east-west foliation during deformation and metamorphism. Remobilization of metals due to metamorphism and deformation likely
occurred at the micro-scale and resulted primarily in the exsolution of gold and its associated trace elements from recrystallized pyrite.
This study provides further evidence for a major synvolcanic gold event in the southern Abitibi. It
indicates that the Horne deposit is associated with calc-alkaline felsic volcanic rocks and is consistent with the preferential association between Archean synvolcanic gold and the early phases of rifting of a thickened arc crust towards the end of
the southern Abitibi greenstone belt volcano-magmatic construction. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Le principal objectif de la phase 5 (2015-2020) du programme de l'Initiative géoscientifique ciblée (IGC) de Ressources naturelles Canada et de
la Commission géologique du Canada était de générer de nouvelles connaissances, méthodologies et modèles pour améliorer la capacité de l'industrie de l'exploration à détecter les gisements enfouis. Ce volume de synthèse contient 20 articles
individuels qui traitent des caractéristiques des gisements aurifères à l'échelle du craton à celle du gisement, ainsi que certains documents reliés au projet Gold de l'IGC-5. |
| GEOSCAN ID | 323663 |
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