Seal Plutonic Suite
Stratigraphic label: [mpro]sea
Map symbol: mPsea

First published: 20 October 2017
Last modified:














Translation of original French






Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
Author: Moukhsil and Côté, 2017
Age: Mesoproterozoic
Reference section: Referene outcrop of foliated granite (16-AE-2009)
Type area: NTS sheet 31P12
Geological province: Grenville Province
Geological subdivision: Allochton
Lithology: Granite, gabbronorite
Type: Lithodemic
Rank: Suite
Status: Formal
Use: Active






The Seal Intrusive Suite was defined during the work of Moukhsil and Côté (2017) in the Wemotaci area, Haut-Saint-Maurice.




The Seal Plutonic Suite is a lithodemic unit consisting mainly of granite mapped in the southeast corner of sheet 31P12. Analyzed samples contain 69-75% SiO2 and 4-5.6% K2O. These rocks are metaluminous (Maniar and Piccoli, 1989) and type I (igneous, Chappell and White, 1974).



The pinkish granite is medium grained, foliated and contains biotite, magnetite and traces of clinopyroxene. Plagioclase is sericitized and quartz has undulatory extinction; zircon and apatite are accessory minerals. Gabbronorite intruding into granite is greyish, medium grained, foliated and locally leucocratic. It is composed of plagioclase, orthopyroxene, clinopyroxene, biotite and amphibole. This suite contains deformed metric to decametric klippes of paragneiss from the Wabash Complex and enclaves of the Pope Plutonic Suite.


Thickness and Distribution

This rounded unit is clearly visible on aeromagnetic maps. It has a diameter of approximately 8.5 km.




Stratigraphic Relationship(s)

The Seal Plutonic Suite intrudes into the Pope Plutonic Suite. It also contains deformed klippes of the Wabash Complex. 


Does not apply.


Author(s) Title Year of Publication Hyperlink (EXAMINE or Other)


Géologie de région de Wemotaci, Haut-Saint-Maurice (Partie ouest du Grenville). Ministère de l’Énergie et des Ressouces naturelles, Québec; RG 2017-03, 44 pages, 2 maps. 2017 RG 2017-03






13 février 2019