Bordeleau Formation
Stratigraphic label: [narc]bo
Map symbol: nAbo

First published: 27 March 2018
Last modified:




















Translation of original French



Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
Author: Caty, 1977
Age: Neoarchean
Reference section: The selected stratotype corresponds to the Moisan (1992) study area along Road 167, east of Waconichi Lake (UTM NAD83, Zone 18: 569339E, 5546547N). Site 1 consists of five sections, three of which were directly along Road 167, and two along Waconichi Lake (see Moisan, 1992, Figure 5 on page 13).
Type area: East of Waconichi Lake (sheet 32J01-200-0102) and South of Chevrillon Lake (sheet 32J01-200-0101)
Geological province: Superior Province
Geological subdivision: Abitibi Subprovince
Lithology: Sedimentary rocks
Type: Lithostratigraphic
Rank: Formation
Status: Formal
Use: Active


Related unit(s)




The Bordeleau Formation was first mentioned in Caty’s (1977) report on the eastern half of Richardson Township. Firstly, basal tuff is described (Caty, 1977, 1979). Then, sandstone and turbidites characterizing most of the Bordeleau Formation are compared with those of the Daubrée Formation (Dimroth et al., 1983); these rock units are also the subject of a master’s thesis (Moisan, 1992).



The base of the Bordeleau Formation, east of Waconichi Lake, consists of a unit of fine to medium-grained intermediate tuff interstratified with sedimentary rocks of the Blondeau Formation (Caty, 1979). These volcaniclastic rocks have also been identified on the south shore of Chevrillon Lake, north of the Faribault Shear Zone. The upper portion of the Bordeleau Formation includes feldspathic arenites and turbidites composed of sorted arkose and mudstone (Moisan, 1992). 


Thickness and Distribution

The Bordeleau Formation outcrops primarily between Chevrillon and Waconichi lakes (NTS sheets 32J01 and 32J02) and follows the axial trace of the Waconichi Syncline. Its centre is limited by the Faribault Shear Zone to the south and by the Winsch Shear Zone to the north (Moisan, 1992). The average thickness of this formation is 1000 m (Daigneault, 1991).




Stratigraphic Relationship(s)

The basal contact of the Bordeleau Formation is characterized by an interstratification between volcanogenic sedimentary rocks characterizing the Blondeau Formation and volcaniclastic rocks of intermediate composition at the base of the Bordeleau Formation. Sedimentary rocks of the Bordeleau Formation form a transitional unit to the Opemisca Group (Caty, 1979; Dimroth et al., 1983).


Does not apply.


Author(s) Title Year of Publication Hyperlink (EXAMINE or Other)
CATY, J.L. Demie est du canton de Richardson (comté d’Abitibi-Est) – Rapport préliminaire. Ministère des Richesses naturelles, Québec; DPV-447, 12 pages, 1 plan. 1977 DPV 447
CATY, J.L. Géologie de la demie ouest du canton de Bignell. Ministère de l’Énergie et des Ressources, Québec; DPV-678, 22 pages, 1 plan. 1979 DPV 678
DAIGNEAULT, R. Évolution structurale du segment de roches vertes de Chibougamau, Sous-province archéenne de l’Abitibi, Québec. Université Laval; doctoral thesis, 352 pages. 1991
DIMROTH, E. – MUELLER, W. – ROCHELEAU, M. – ARCHER, P. – JUTRAS, M. – PICHÉ, M. – SIMONEAU, P. – CARIGNAN, J. – CHOWN, E. H. – GUHA, J. – GOULET, N. – ALLARD, G. O. – FRANCONI, A. – GOBEIL, A. Stratigraphie et évolution du bassin de transition entre les groupes de Roy et d’Opémisca, région de Chibougamau-Chapais. Dans : Stratigraphie des ensembles volcano-sédimentaires archéens de l’Abitibi : état des connaissances. Ministère de l’Énergie et des Ressources, Québec; DV 83-11, pages 21-33. 1983 DV 83-11
MOISAN, A. Pétrochimie des grès de la Formation de Bordeleau, Chibougamau Québec. Université du Québec à Chicoutimi; master’s thesis, 132 pages. 1992 Source





24 mai 2019