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Translation of original French
| Author: | Daigneault and Allard, 1990 |
| Age: | Neoarchean |
| Reference section: | None |
| Type area: | The unit does not outcrop, but it has been identified in drilling northeast of Îles Lake (southeastern portion of NTS sheet 32G16; Daigneault and Allard, 1990) |
| Geological province: | Superior Province |
| Geological subdivision: | Abitibi Subprovince |
| Lithology: | Mafic to ultramafic intrusive rocks |
| Type: | Lithodemic |
| Rank: | Lithodeme |
| Status: | Informal |
| Use: | Active |
Background
The magnetitite 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).
Description
The magnetitite subzone does not outcrop and has only been recognized in one drilling. Rocks of this zone consist of magnetite ferrogabbro and ferropyroxenite (Daigneault and Allard, 1990).
Thickness and Distribution
The magnetitite subzone is <30 m thick (Daigneault and Allard, 1990). It corresponds to a strong positive magnetic anomaly continuous over 21 km southeast of Chibougamau Lake (Daigneault and Allard, 1990; Keating and D’Amours, 2010).
Dating
None.
Stratigraphic Relationship(s)
According to Daigneault and Allard (1990), rocks of the magnetitite subzone form the base of the Lac Doré Intrusive Suite. They are overlain by rocks of the anorthositic zone.
Paleontology
Does not apply.
References
| 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, Geological 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 |