|Author:||Daigneault and Allard, 1990|
|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|
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).
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).
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).
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.
Does not apply.