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Ango Suite
Stratigraphic label: [narc]ang
Map symbol: nAang
 

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. 

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
 
None
 
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

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. http://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). 

 
12 mai 2021