| Titre | Zircon from altered monzonite rocks provides insights into magmatic and mineralizing processes at the Douay Au Project, Abitibi Greenstone Belt |
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| Auteur | Mathieu, L ;
Wasuita, T D; Sherlock, R; Speidel, F; Marsh, J H; Dubé, B; Côté-Mantha, O |
| Source | Geosciences vol. 12, issue 114, 2022 p. 1-29, https://doi.org/10.3390/geosciences12030114  Accès ouvert |
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| Année | 2022 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20220045 |
| Éditeur | MDPI |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.3390/geosciences12030114 |
| Media | papier; numérique; en ligne |
| Formats | pdf |
| Province | Ontario; Québec |
| SNRC | 32E |
| Lat/Long OENS | -80.0000 -78.0000 50.0000 49.0000 |
| Sujets | syenites; carbonatites; intrusions; or; gîtes magmatiques; système hydrothermal; Ceinture d'Abitibi Greenstone ; minéralogie; pétrologie ignée et métamorphique |
| Illustrations | cartes de localisation; tableaux; photographies; coupes composées; images; graphiques; cartes géochronologiques; diagrammes Concordia |
| Diffusé | 2022 03 02 |
| Résumé | (disponible en anglais seulement)
Zircon provides essential information on the age and oxidation state of magmatic systems and can be used to characterize magmatic-hydrothermal Au mineralizing
systems. Using the Douay intrusion-related gold system (IRGS) as a type example of Neoarchean syenite-associated mineralization (Abitibi greenstone belt), we demonstrate that zircon from altered quartz-monzonite rocks can also be used to infer the
age of a magmatic-hydrothermal event. Here, zircon chemistry is used to identify the following sequence of events at the Douay exploration project: (1) the crystallization of zircon at ~2690 Ma in evolved residual melts with distinct U-contents
(quartz-monzonite magma); (2) the extensive radiation damage for the U-rich grains over a period of ~10-15 My; and (3) the alteration of zircon grains at ~2676 Ma by interaction with magmatic-hydrothermal mineralizing fluids derived from syenite and
carbonatite intrusive phases. This study also distinguishes extensively altered zircon grains from pristine to least-altered zircon formed in distinct magmatic environments using a Th/U vs. U discrimination diagram. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Cet article présente les résultats d'une étude des roches magmatiques qui encaissent la minéralisation aurifères du gisement Douay dans la
région de l'Abitibi-Témiscamingue dans le nord-ouest québécois. La chimie du zircon, un minéral commun des roches magmatiques, permet de documenter la formation du gisement. |
| GEOSCAN ID | 330004 |
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