| Titre | The Archean Westwood Au deposit, southern Abitibi: telescoped Au-rich VMS and intrusion-related Au systems |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Yergeau, D; Mercier-Langevin, P; Dubé, B; Malo, M; McNicoll, V J; Jackson, S E ; Savoie, A; La Rochelle, F |
| 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. 177-191, https://doi.org/10.4095/296638  Accès ouvert |
| Image |  |
| Année | 2015 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/296638 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Targeted
Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration |
| Référence reliée | Cette publication est reliée à The Archean
Westwood Au deposit, southern Abitibi: telescoped Au-rich VMS and intrusion-related Au systems |
| Formats | pdf |
| Province | Québec |
| SNRC | 32D/01 |
| Région | Doyon; Bousquet; LaRonde; Abitibi |
| Lat/Long OENS | -78.5000 -78.0000 48.2500 48.0000 |
| Sujets | gisements minéraux; minéralisation; gîtes minéralogiques; or; argent; cuivre; zinc; plomb; sulfures; gîtes sulfureux; altération; altération hydrothermale; gîtes volcanogènes; Archéen; lithogéochimie;
déformation; métamorphisme; Camp minier de Doyon-Bousquet-Laronde; Dépôt de Westwood ; Ceinture d'Abitibi Greenstone ; Formation de Bousquet ; géologie économique; minéralogie |
| Illustrations | cartes de localisation; photographies; graphiques; tableaux |
| Programme | Initiative géoscientifique ciblée (IGC-4) Étude des gîtes d'or |
| Diffusé | 2015 06 11; 2023 03 17 |
| Résumé | (disponible en anglais seulement)
The Westwood deposit (3.74 Moz Au) is part of the Doyon-Bousquet-LaRonde mining camp. The deposit is hosted in the 2699-2996 Ma Bousquet Formation that forms a
moderately to highly-strained, steeply south-dipping and east-west-trending, upper greenschist/lower amphibolite facies, homoclinal volcano-plutonic sequence that faces south.* The Westwood deposit consists of three east-west-trending and steeply
south-dipping mineralized corridors that are stacked from north to south: the Zone 2 Extension, the North Corridor, and the Westwood Corridor. The Zone 2 Extension consists of transposed centimetre- to decimetre-wide pyrite } chalcopyritesphalerite-
rich quartz veins and disseminations whereas the North Corridor consists of centimetre- to decimetre-wide quartz-pyrite-chalcopyrite } sphalerite-galena-pyrrhotite veins and disseminations as well as thin, semi-massive to massive sulphide veins. The
Westwood Corridor consists of discontinuous stratabound polymetallic semi-massive to massive sulphide lenses, veins and disseminations.
The Westwood and North corridors are associated with a large, semi-conformable to discordant Mn-rich garnet and
biotite distal alteration halo that hosts a zone of more proximal sericite-dominated alteration. The Zone 2 Extension is characterized by a 2-10-m wide zone of intense biotite and sericite (} gypsum) alteration and local alteration zones composed of
an assemblage of quartz-andalusite-kyanite-pyrophyllite. Mapping and 3-D modeling of the alteration zones strongly suggests that the Zone 2 Extension alteration overprints that of the North and Westwood corridors.
The Westwood and North corridors
are considered to be subseafloor to seafloor (VMS-type) mineralization, whereas the Zone 2 Extension vein system is proposed to represent the eastward extension of the intrusion-associated Doyon Au deposit located less than 1.5 km west of Westwood.
The Doyon system is rooted in, and possibly genetically related to, the polyphase Mooshla synvolcanic intrusive complex. The three mineralized corridors at Westwood were probably formed in a ?2 Ma time span, as indicated by U-Pb zircon geochronology.
By analogy with telescoped porphyry-epithermal systems, the three mineralized corridors of the Westwood deposit may represent various components of a submarine Archean auriferous synvolcanic magmatic-hydrothermal system, providing a unique
opportunity to improve and expand metallogenic and exploration models for Archean greenstone belts. |
| Sommaire | (Résumé en langage clair et simple, non publié)
L'Initiative géoscientifique ciblée (IGC-4) est un programme géoscientifique fédéral de collaboration dont le mandat consiste à fournir à
l'industrie la nouvelle génération de connaissances géoscientifiques et de techniques novatrices permettant de cibler plus efficacement les gîtes minéraux enfouis visant à réduire les risques associés à l'exploration minérale. Ce volume synthétise 18
activités de recherche complétées dans le cadre du projet sur les systèmes minéralisés or épigénétique de l'IGC-4. Ces activités portaient notamment sur les gisements d'or contenus dans les terrains anciens, déformés et métamorphisés principalement
localisés dans les provinces géologiques du Supérieur et la portion occidentale de celle de Churchill. |
| GEOSCAN ID | 296638 |
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