| Titre | Volcanology, chemo-stratigraphy, geochronology, hydrothermal alteration and VMS potential of the Lemoine Member of the Waconichi Formation, Chibougamau district, Abitibi greenstone belt, Quebec |
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| Auteur | Ross, P -S; Boulerice, A; Mercier-Langevin, P; McNicoll, V |
| Source | Mineralium Deposita 2019 p. 1-26, https://doi.org/10.1007/s00126-019-00884-6  Accès ouvert |
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| Année | 2019 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190104 |
| Éditeur | Springer Nature |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1007/s00126-019-00884-6 |
| Media | papier; en ligne; numérique |
| Formats | pdf (Adobe® Reader®); html |
| Province | Québec |
| SNRC | 32G/16SE; 32H/13SW |
| Région | Chibougamau Mining District; Lake Chibougamau; Lac Monette; Lake Yvette |
| Lat/Long OENS | -74.0825 -73.9997 49.8106 49.7875 |
| Sujets | Archéen; gisements minéraux; prospection minière; directives d'exploration; gîtes volcanogènes; gîtes sulfureux; métaux de base; métaux précieux; zinc; cuivre; or; argent; genèse des minerais;
minéralisation; ceintures de roche verte; évolution tectonique; volcanisme; système hydrothermal; altération hydrothermale; chloritisation; séricitisation; carbonation; épidotisation; vulcanologie; échantillons carrotés; intrusions; filons rocheux;
mise en place; antecedents thermiques; diagraphie géophysique; analyses pétrographiques; lithogéochimie; datation radiométrique; datation au uranium-plomb; datations au zircon; géologie du substratum rocheux; lithologie; roches ignées; roches
volcaniques; coulées de lave; rhyolites; andésites; basaltes; dacites; volcanoclastique; hyaloclastites; roches volcaniques felsiques; laves felsiques; roches volcaniques mafiques; roches intrusives; porphyres quartziques-feldspathiques; gabbros;
roches intrusives felsiques; diorites; caractéristiques structurales; failles; orifices volcaniques; travaux de prospection; lithofaciès; analyses de textures; amygdales; géochimie des éléments en trace; assemblages de minéraux; anomalies
géochimiques; Ceinture d'Abitibi Greenstone ; Groupe de Roy ; Formation de Waconichi ; géologie économique; stratigraphie; tectonique; géochimie; géochronologie; géophysique; Précambrien |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; coupes transversales; tableaux; diagrammes à secteurs; photographies; photomicrographies; graphiques géochimiques; diagrammes Concordia;
graphiques; représentations schématiques |
| Programme | Initiative géoscientifique ciblée (IGC-5) Systèmes minéralisés aurifères |
| Diffusé | 2019 04 25 |
| Résumé | (disponible en anglais seulement)
The Archean Lemoine volcanogenic massive sulfide (VMS) deposit in the Chibougamau mining district (Abitibi greenstone belt) is one of the richest to have been
mined in the world (758,070 t of ore at 4.17% Cu, 9.51% Zn, 4.56 g/t Au, and 83.73 g/t Ag). It is hosted by the ~ 2728 Ma Lemoine Member of the Waconichi Formation. Field mapping, core logging, petrography, lithogeochemistry, and U-Pb zircon
geochronology helped define the stratigraphy, volcanic architecture, and hydrothermal history of the Lemoine Member east of the former mine, and document the complex relationships between effusive, intrusive, and hydrothermal activity. There, the
Lemoine Member is informally divided into a 700 to 900-m-thick lower part (~ 45% extrusive and ~ 55%intrusive) and a 600 to 700-m-thick upper part (~ 85%extrusive and ~ 15%intrusive). Extrusive units in the lower part have a tholeiitic to
transitional magmatic affinity and are dominantly felsic, whereas those of the upper part have a transitional to calc-alkaline affinity and are dominantly mafic. The effusive felsic units are mostly interpreted as one or more lobe-hyaloclastite
flow(s) per unit. Possible volcanic vent sites for all effusive units were identified. Three types of hydrothermal alteration are present in the lower part of the Lemoine Member in the study area, from stratigraphic base to top: chlorite-sericite,
sericite-chlorite, and sericite-chlorite-carbonate±epidote. Within this broad pattern, three paleo-hydrothermal upflow zones are proposed, and some correspond with known base and precious metal anomalies and/or proposed volcanic vent
locations. |
| GEOSCAN ID | 314764 |
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