Lac Cabot Suite
Stratigraphic label: [ppro]cab
Map symbol: pPcab

First published: 30 January 2019
Last modified:












Translation of original French




Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
Author: Hammouche et al., 2011
Age: Paleoproterozoic
Stratotype: None
Type area: Merville Lake area (NTS sheet 23P02)
Geological province: Churchill Province
Geological subdivision: Mistinibi-Raude Lithotectonic Domain
Lithology: Monzonite and granite
Category: Lithodemic
Rank: Suite
Status: Formal
Use: Active




This unit was defined as the “Cabot Lake and Résolution Lake Intrusion” by Taner (1992) to describe two foliated and mylonitized monzonitic to granitic intrusions. Danis (1991) also used the term “Cabot Lake Granite” in the SE corner of sheet 23P02. The work of Hammouche et al. (2011, 2012) assigned several intrusions to this unit based on their petrographic, geochemical and geophysical similarities. They also elevated the unit to the suite rank and renamed it the “Lac Cabot Suite”.





The Lac Cabot Suite is associated with strong positive aeromagnetic anomalies; it consists of monzonite and granite, locally quartz monzodiorite. These rocks are either foliated to mylonitic or little deformed. Their grain size varies from coarse to fine, and significant grain size reduction associated with mylonitization is visible in places. Rocks are pinkish grey in fresh exposure and light pink in altered surface. They have a porphyroclastic to augen texture with 2cm to 4 cm long K-feldspar phenocrystals. They contain biotite (≤10%), some hornblende, epidote and magnetite. The granitic facies also contains muscovite (≤5%). Sphene (≤4%) generally occurs as a rim around magnetite. Chlorite replaces micas and plagioclase is variously sericitized. Apatite, zircon and allanite are present in accessory amounts. Taner (1992) also mentions the presence of late alteration minerals such as chlorite, carbonate and prehnite.



Thickness and Distribution

The Lac Cabot Suite forms a series of intrusions 0.7 km to 4 km wide by 1 km to 7 km long, specifically in the SW part of the Mistinibi-Raude Lithotectonic Domain (Charette et al., 2019). These intrusions cover a total area of ~66 km2.



Stratigraphic Relationship(s)

The Lac Cabot Suite intrudes into gneiss of the Advance and Elson complexes, as well as in mylonitic rocks of the Zeni Complex (ApPzen2).


Does not apply.


Author(s) Title Year of Publication Hyperlink (EXAMINE or Other)
HAMMOUCHE, H. – LEGOUIX, C. – GOUTIER, J. – DION, C. Géologie de la région du lac Zeni. Ministère des Ressources naturelles, Québec; RG 2012-02, 35 pages, 1 plan. 2012 RG 2012-02
HAMMOUCHE, H. – LEGOUIX, C. – GOUTIER, J. – DION, C. – PETRELLA, L. Géologie de la région du lac Bonaventure. Ministère des Ressources naturelles, Québec; RG 2011-03, 35 pages, 1 plan. 2011 RG 2011-03
CHARETTE, B. – LAFRANCE, I. – VANIER, M.-A. –  GODET, A. Mistinibi-Raude Domain, Southeastern Churchill Province, Nunavik, Quebec, Canada: Geological Synthesis. Ministère de l’Énergie et des Ressources naturelles, Québec. BG 2019-07. 2019 BG 2019-07
DANIS, D. Géologie de la région du lac Raude, Territoire-du-Nouveau-Québec. Ministère de l’Énergie et des Ressources, Québec; ET 88-10, 72 pages, 5 plans. 1991 ET 88-10
TANER, M.F. Reconnaissance géologique de la région du lac Juillet, Territoire-du-Nouveau-Québec. Ministère de l’Énergie et des Ressources, Québec; MB 91-19, 132 pages, 5 plans. 1992 MB 91-19
20 août 2020