| Titre | Structural controls and relative timing of gold mineralization of the banded iron formation-associated Tiriganiaq deposit, Meliadine district, Rankin Inlet greenstone belt, Nunavut |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | St. Pierre, B; Mercier-Langevin, P; Blais, J -C; Servelle, G; Simard, M; Côté-Mantha, O; Malo, M |
| 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. 237-250, https://doi.org/10.4095/326041  Accès ouvert |
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| Année | 2020 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/326041 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Targeted
Geoscience Initiative 5: contributions to the understanding of Canadian gold systems |
| Référence reliée | Cette publication est reliée à les
publications suivantes |
| Formats | pdf |
| Province | Nunavut |
| SNRC | 55J/13; 55J/14; 55K/15; 55K/16; 55N/01; 55N/02; 55N/07; 55N/08; 55O/03; 55O/04; 55O/05; 55O/06 |
| Région | Rankin Inlet |
| Lat/Long OENS | -92.8167 -91.2333 63.2667 62.7667 |
| Sujets | gisements minéraux; or; genèse des minerais; minéralisation; contrôles des minerais; contrôles structuraux; prospection minière; directives d'exploration; ceintures de roche verte; établissement de
modèles; géologie du substratum rocheux; lithologie; roches sédimentaires; formations ferrifères; turbidites; siltstones; roches ignées; roches volcaniques; roches volcaniques mafiques; roches intrusives; roches intrusives mafiques; caractéristiques
structurales; failles; failles mineures évasantes; plis; zones de cisaillement; foliation; filons; filons rocheux; cadre tectonique; antécédents tectoniques; déformation; analyse cinématiques; analyses géométriques; tendances structurelles; rapports
sur le terrain; pieces; Archéen; Province de Churchill ; Faille de Pyke ; Paléoprotérozoïque; géologie économique; géologie régional; géologie structurale; tectonique; Sciences et technologie; Nature et environnement; Précambrien;
Protérozoïque |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; coupes lithologiques; tableaux; coupes schématiques transversales; photographies; dessins; coupes transversales; modèles |
| Programme | Initiative géoscientifique ciblée (IGC-5) Systèmes minéralisés aurifères |
| Diffusé | 2020 06 11; 2023 03 17 |
| Résumé | (disponible en anglais seulement)
The Meliadine gold district is hosted within the Archean (ca. 2660 Ma) polydeformed Rankin Inlet greenstone belt, Nunavut. The district comprises numerous gold
deposits and prospects that are spatially associated with the Pyke Fault and its splays. This includes the currently producing Tiriganiaq deposit, which is hosted within the turbidite-dominated structural hanging wall of the Lower Fault, a
west-trending splay of the Pyke Fault.
The 1150 and 1250 'lode series' within the Tiriganiaq deposit are a series of ore zones with complex geometries. Before underground development, the knowledge of gold-grade distribution in these zones was
based on surface drilling results and could therefore not take into account some of the small-scale structural features that control ore grade and ore zone geometry (e.g. <25 m wavelength folding).
New field relationships document the importance
of horizontal to shallowly south-dipping ore-bearing extensional quartz±ankerite veins. These veins are associated with sulphide replacement zones that are preferentially developed in tightly folded banded iron formation (BIF) intervals. Folding and
veining are associated with the main phase of deformation in the deposit area, which corresponds to the second phase (D2) of regional deformation. The D2 deformation at the Tiriganiaq deposit can be further subdivided into two main protracted phases:
the first phase (D2A), which is associated with northeast-southwest-oriented shortening and F2A folding; and the second phase (D2B), which is associated with north-south shortening, further folding (F2B), and reverse shearing and veining (shallowly
south-dipping extension veins and moderately north-dipping shear veins). The 1150 and 1250 lodes provide an excellent example of the complex geometry of the ore-bearing veins found within the shallowly west-plunging F2B folded BIF successions. These
zones provide some of the highest gold grades within the Tiriganiaq deposit and thus highlight the importance of fold hinges and their effect on the generation of favourable traps (thickened BIF intervals), the development of narrow shears (along the
limbs), and the development of associated extensional veins in the competent BIF layers, forming structurally and lithologically controlled high-grade zones. |
| 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 | 326041 |
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