| Titre | Targeted Geoscience Initiative 5, Gold Project: a summary of contributions to the understanding of Canadian gold systems |
| Télécharger | Téléchargement (publication entière) |
| |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Mercier-Langevin, P; Lawley, C J M ; Castonguay, S; Dubé, B; Bleeker, W; Pinet, N; Bécu, V; Pilote, J -L; Jackson, S E; Wodicka, N; Honsberger, I W; Davis, W J; Petts, D C; Yang, Z; Jautzy, J; Lauzière, K |
| 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. 1-30, https://doi.org/10.4095/323662  Accès ouvert |
| Année | 2020 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/323662 |
| 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 | Canada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon;
Nunavut; Canada |
| SNRC | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Lat/Long OENS | -141.0000 -50.0000 90.0000 41.7500 |
| Sujets | gisements minéraux; or; prospection minière; méthodes d'exploration; directives d'exploration; genèse des minerais; minéralisation; contrôles des minerais; modèles; cadre tectonique; évolution tectonique;
evolution de la croûte; roches mères; mécanismes de transport; fluage; mécanismes d'écoulement; méthodes de prospection; méthodes analytiques; statistiques de prospection minière; activités d'exploration; activités minières; économique; Province de
Superior ; Recherche coopérative; Méthodologie; géologie économique; Sciences et technologie; Nature et environnement; Économie et industrie; Éducation et formation; Phanérozoïque; Précambrien |
| Illustrations | diagrammes schématiques; diagrammes à secteurs; graphique à barres; séries chronologiques; cartes de localisation; cartes géolscientiques généralisées; histogrammes; diagrammes de fréquence
cumulée; tableaux |
| Programme | Initiative géoscientifique ciblée (IGC-5) Systèmes minéralisés aurifères |
| Diffusé | 2020 06 11 |
| Résumé | (disponible en anglais seulement)
The discovery of new mineral deposits is essential to maintain a stable supply of mineral commodities, however, new mineral discoveries are in ever more remote,
deeper, and/or covered geological environments, which presents significant challenges. The fifth phase of the Targeted Geoscience Initiative (TGI-5) was developed to address these challenges and to advance our understanding of ore-forming processes
at various spatial scales and across geological time. Here we present a selection of highlights from research activities comprising the Gold Project. These research activities, all of which included significant field components, focused on different
aspects of the gold mineral systems and included gold districts with variable metal endowment (e.g. southern and northern Neoarchean Abitibi greenstone belt), geological setting (e.g. pre-, syn-, and post-orogenic processes), and geological age (e.g.
Paleoproterozoic Trans-Hudson, and Phanerozoic Appalachian orogenic belts).
The southern Abitibi is host to many different types of giant gold deposits (e.g. synvolcanic and orogenic gold ore systems), although the sources of ore-components for
these mineral systems remained unclear. New TGI research addressed this knowledge gap and demonstrate that (1) diagenetic sulphides (pyrite nodules) and their host sedimentary sequences within the Superior Province are pre-enriched in gold; (2)
Archean calc-alkaline felsic volcanic centres associated with large synvolcanic gold deposits further suggest that igneous differentiation in the lower crust may be associated with the generation of synvolcanic gold-rich magmatic-hydrothermal
systems; and (3) undocumented upper mantle pathways existed, which were revealed by anomalous ore-forming element concentrations within cratonic mantle samples from the southern Superior Province. Together these research activities provide new
insights into the upgrading of ore components from the mantle to the upper crust, although the role of these pre-enriched source rocks to gold ore systems remains unclear.
Other research activities focused on the complete source-to-ore pathways of
gold-bearing fluids for multiple gold districts across Canada. The similar pacing of events and timing of auriferous vein development within the overall tectonic evolution for several of these gold districts likely reflects a common driver (e.g.
upwelling asthenosphere) and/or tectonic triggers (e.g. crustal extension and associated magmatism). However, the contrasting metal endowment of areas with otherwise similar histories (e.g. southern versus northern Abitibi belt) suggests that the
prospectivity of gold districts is not entirely related to the large-scale drivers and triggers of ore-forming fluids. Moreover, long-term preservation is another critical factor in gold ore systems, which is promoted by rapid burial; limited
post-ore remobilization during hydrothermal and metamorphic overprinting; and long-term craton stability. Indications of preferential preservation, such as the occurrence of synorogenic polymict conglomerate, constitute key exploration
criteria.
New analytical methods that were developed as part of TGI-5 are also providing new tools (e.g. rapid in situ element mapping and data interrogation approaches; new geochronological methods; clumped isotope thermometers) for recognizing
ore-proximal depositional controls from the rock record. An improved understanding of these controls and efficient vectoring tools are increasingly important for mineral exploration targeting. |
| 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 | 323662 |
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