First published: 28 August 2019
Last modified:
DISCLAIMER: This English version is translated from the original French. In case of any discrepancy, the French version shall prevail.
| Author(s): | Talla Takam et al., in preparation |
| Age: | Neoarchean |
| Stratotype: | None |
| Type area: | Léran Lake area (NTS sheet 23D15) |
| Geological province: | Suprerior Province |
| Geological subdivision: | Opinaca Subprovince |
| Lithology: | Granite, quartz monzodiorite, charnockite, mangerite |
| Category: | Lithodemic |
| Rank: | Lithodeme |
| Status: | Formal |
| Use: | Active |
- Ango Suite
- Artigny Pluton
- Nichikun Pluton
Background
The Artigny Pluton was introduced by Talla Takam et al. (in preparation) following geological mapping work carried out by the Ministère in the Léran Lake area during the summer of 2016.
Description
The Artigny Pluton consists of biotite-magnetite ± hornblende granite and quartz monzodiorite, locally granodiorite, having a well-developed porphyraceous texture. Granite is homogeneous, pinkish grey or yellowish grey, massive to slightly foliated and medium to coarse grained. This highly magnetic intrusion is clearly visible on aeromagnetic maps. The porphyraceous texture is related to the presence of 10 to 40% K-feldspar phenocrystals 1 to 5 cm long, more or less aligned with the magmatic foliation. The rock also contains biotite (1-15%), hornblende (up to 12%) and magnetite (2-5%). Sphene and garnet are also present as accessory phases (trace-2%). Locally, the rock contains up to 5% hypersthene. Paragneiss enclaves probably belonging to the Laguiche Complex are reported.
Thickness and distribution
The Artigny Pluton is located west of sheet 23D15 and is 25 km by 13 km in an N-S orientation.
Dating
| Unit | Sample Number | Isotopic System | Mineral | Crystallization Age (Ma) | (+) | (-) | Reference(s) |
| nAart | 2016-FT-3014A | U-Pb | Zircon | 2599 | 4 | 4 | Davis and Sutcliffe, 2019 |
Stratigraphic Relationship(s)
Rocks of the Artigny Pluton are among the latest in the area. Only rocks of the Viau Suite, dated to 2572 Ma (Parent, 1998), are younger. They are intrusive in sedimentary rocks of the Laguiche Complex.
Paleontology
Not applicable.
References
Publications available through SIGÉOM Examine
DAVIS, D W., SUTCLIFFE, C N., 2018. U-Pb Geochronology of Zircon and Monazite by LA-ICPMS in samples from northern Quebec. UNIVERSITY OF TORONTO; MB 2018-18, 54 pages.
PARENT, M., 1998. GEOCHRONOLOGIE U-PB DU PROJET MOYEN-NORD, PHASE II. rapport statutaire soumis au gouvernement du Québec; GM 59904, 63 pages.
TALLA TAKAM, F., BEAUCHAMP, A.-M., MASSEI, F. In preparation. Géologie de la région du lac Emmanuel (33A09, 33A10, 33A15, 33A16) et du lac Léran (23D11, 23D12, 23D13, 23D14 et 23D15), Eeyou Istchee Baie-James, Québec. Ministère de l’Énergie et des Ressources naturelles, Québec.
Suggested Citation
Ministère de l’Énergie et des Ressources naturelles (MERN). Artigny Pluton. Quebec Stratigraphic Lexicon. http://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/pluton-artigny_en [accessed on Day Month Year].
Contributors
|
First publication |
Frédéric Massei, P. Geo., M.Sc. frederic.massei@mern.gouv.qc.ca (redaction) Mehdi A. Guemache, P. Geo., Ph.D. (coordination and critical review); Simon Auclair, P. Geo., M.Sc. (editing); Céline Dupuis, P. Geo., Ph.D. (English version); Nathalie Bouchard (HTML editing). |