Lac Doré peridotitic subzone
Stratigraphic label: [narc]dep
Map symbol: nAdep

First published: 12 December 2018
Last modified:





















Translation of original French



Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
Author: Daigneault and Allard, 1990
Age: Neoarchean
Reference section: None
Type area: Outcrops primarily in the David Lake area (southwestern portion of the NTS sheet 32G16)
Geological province: Superior Province
Geological subdivision: Abitibi Subprovince
Lithology: Mafic to ultramafic intrusive rocks
Type: Lithodemic
Rank: Lithodeme
Status: Informal
Use: Active



The peridotitic subzone was established by Daigneault and Allard (1990) and included in the “Lower Series”. It now represents an informal lithodeme of the Lac Doré Lower Unit (Leclerc et al., 2017).



The peridotitic subzone is characterized by a succession of rhythmic layers of peridotite, pyroxenite and gabbro. On a total magnetic field map, it corresponds to a positive magnetic anomaly (Daigneault and Allard, 1990; Keating and D’Amours, 2010).


Thickness and Distribution

The peridotitic subzone outcrops on the northern flank of the Chibougamau Anticline, particularly in the David Lake area. A small ovoid mass (300 m x 400 m) is also known south of Clark Lake, and a number of E-W-oriented lenses appear in the Marguerite Island area (northeastern portion of sheet 32G16).




Stratigraphic Relationship(s)

The peridotitic subzone is interstratified within the anorthositic zone and forms a horizon 5 to 10 m thick (Daigneault and Allard, 1990).


Does not apply.


Author(s) Title Year of Publication Hyperlink (EXAMINE or Other)
DAIGNEAULT, R. – ALLARD, G.O. Le Complexe du lac Doré et son environnement géologique (région de Chibougamau – Sous-province de l’Abitibi). Ministère de l’Énergie et des Ressources, Québec; MM 89-03, 290 pages. 1990 MM 89-03
KEATING, P. – D’AMOURS, I. Réédition des données numériques en format GEOSOFT (profils) des levés aéroportés de l’Abitibi, au Québec. Ministère des Ressources naturelles et de la Faune, Québec, Geologique Survey of Canada; 6 pages. 2010 DP 2010-09
LECLERC, F. – ROY, P. – HOULE, P. – PILOTE, P. – BÉDARD, J.H. – HARRIS, L.B. – McNICOLL, V.J., VAN BREEMEN, O. – DAVID, J. – GOULET, N. Géologie de la région de Chibougamau. Ministère de l’Énergie et des Ressources naturelles, Québec; RG 2015-03, 97 pages, 6 plans. 2017 RG 2015-03



16 janvier 2020