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): | Hammouche and Burniaux, 2018 |
| Age: | Neoarchean |
| Stratotype: | None |
| Type area: | Léran Lake (NTS sheet 23D15) and Joubert Lake (sheet 23E03) areas |
| Geological province: | Suprerior Province |
| Geological subdivision: | La Grande and Opinaca subprovinces |
| Lithology: | Granite and quartz monzonite |
| Category: | Lithodemic |
| Rank: | Suite |
| Status: | Formal |
| Use: | Active |
- Ango Suite
Background
The Ango Suite was introduced by Hammouche and Burniaux (2018) to describe K-feldspar megaporphyritic intrusions associated with strong positive aeromagnetic anomalies. These intrusions have strong similarities to those of the Lataignant Suite (Lamothe et al., 2000), but isotopic dating indicates that the latter is older.
Description
The Ango Suite comprises two large kilometric intrusions of similar composition and age: the Nichicun Pluton (nAnic) and Artigny Pluton (nAart).
The Nichicun Pluton consists of K-feldspar megaporphyritic biotite-hornblende-magnetite ± garnet granite (Hammouche and Burniaux, 2018).
The Artigny Pluton consists of massive K-feldspar porphyritic biotite-hornblende-magnetite ± garnet granite and quartz monzodiorite, locally granodiorite (Talla Takam et al., in preparation).
Thickness and distribution
The Nichicun Pluton is approximately 17 km by 10 km and is located in the La Grande Subprovince (sheet 23E03). The Artigny Pluton is approximately 25 km by 13 km and is located in the Opinaca Subprovince (sheet 23D15).
Dating
Two isotopic dating events were performed in the Ango Suite, one in the Artigny Pluton (nAart) and the other in the Nichicun Pluton (nAnic).
| Unit | Sample Number | Isotopic System | Mineral | Crystallization Age (Ma) | (+) | (-) | Reference(s) |
| nAart | 2016-FT-3014A | U-Pb | Zircon | 2589 | 4 | 4 | Davis and Sutcliffe, 2019 |
| nAnic | 1998-CB-3195A | U-Pb | Zircon | 2592 | 5.2 | 5.2 | David, 2019 |
Stratigraphic Relationship(s)
The Artigny Pluton inttrudes into metasedimentary rocks of the Laguiche Complex and the Nichicun Pluton into those of the Rivière Salomon Formation. The two plutons contain enclaves of rocks belonging to host sedimentary units.
Paleontology
Does not apply.
References
Publications available through SIGÉOM Examine
DAVID, J., 2018. Datation U-Pb dans la Province du Supérieur effectuées au GEOTOP en 2015-2016. MERN, GEOTOP; MB 2018-16, 24 pages.
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.
HAMMOUCHE, H., BURNIAUX, P., 2018. Géologie de la région du lac Joubert (SNRC 23E03, 23E04, 33H01), municipalité d’Eeyou Istchee Baie-James. MERN; RG 2018-04, 53 pages.
LAMOTHE, D., THERIAULT, R., LECLAIR, A., 2000. GEOLOGIE DE LA REGION DU LAC NITCHEQUON (23E). MRN; RG 99-14, 46 pages, 1 plan.
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. MERN.
Suggested Citation
Ministère de l’Énergie et des Ressources naturelles (MERN). Ango Suite. Quebec Stratigraphic Lexicon. https://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/suite-ango_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). |