Sugluk Group
Stratigraphic label: [ppro]su
Map symbol: pPsu

First published: 9 February 2016
Last modified:























Translation of original French



Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
Author:Lucas and St-Onge, 1991
Reference section: 
Type area: 
Geological province:Churchill Province
Geological subdivision:Ungava Orogen / Narsajuaq Arc (Narsajuaq Terrane)
Lithology:Metasedimentary rocks




The Sugluk Group was defined by Lucas and St-Onge (1991) to describe a kilometric strip of metasedimentary rocks distributed within the Narsajuaq Arc.



Lucas and St-Onge (1991) incorporates in the Sugluk Group graphitic and sulphidic semi-pelitic metasediment strips locally interstratifed with pelite and quartzite units (locally arkosic) or, more rarely, carbonate units (St-Onge and Lucas, 1992). The quartzite contains a high proportion of magnetite and changes locally to iron formation (St-Onge, 1992). The predominance of semi-pelites and the rarity of units characteristic of a platform environment suggest a relatively deep deposition environment.


Thickness and Distribution

Metasediments are dispersed throughout the Narsajuaq Arc and form strips of limited thickness.



Several detrital zircons were dated using a U-Pb method in a quartzite sample taken north of Salluit Bay. The oldest zircon was dated at >2545 Ma, while the youngest gave an age of 1830 ±3 Ma (Parrish, 1989). Some units of the group were intruded and metamorphosed to the granulite facies by tonalitic plutons dated 1830 Ma, this date would approximate deposition of sediments from the Sugluk Group (St-Onge et al., 1992).

Isotopic SystemMineralCrystallization Age (Ma)(+)(-)Reference(s)
U-PbZircon2545Parrish, 1989
U-PbZircon183033Parrish, 1989

Stratigraphic Relationship(s)

Sedimentary rocks of the Sugluk Group are interpreted as deep-water deposits emplaced on the edge of an island arc complex. Geochronology of the Narsajuaq Arc units suggests a rapid burial of sediments likely as a result of overthrusting of units of various intrusive arc suites around 1830 Ma (Parrish, 1989; St-Onge et al., 1992).


No fossil has been reported.


(Note that this table contains the main references. Refer to DV 2007-03 for the complete list of references in the record.)
Author(s)TitleYear of PublicationHyperlink (EXAMINE or Other)
LAMOTHE, D.Lexique stratigraphique de l’Orogène de l’Ungava. Ministère des Ressources naturelles; DV 2007-03, 62 pages.2007
LUCAS, S.B. – ST-ONGE, M.REvolution of Archean and early Proterozoic magmatic arcs in northeastern Ungava Peninsula, Quebec. Geological Survey of Canada; Paper 91-1C, pages 109-119.1991Source
ST-ONGE, M.R. – LUCAS, S.B.New insight on the crustal structure and tectonic history of the Ungava Orogen, Kovik Bay and Cap Wolstenholme, Quebec. Geological Survey of Canada; Research in progress,Part C, Paper 92-1C, pages 31-41.1992Source
ST-ONGE, M.R. – LUCAS, S.B. – PARRISH, R.R.Terrane accretion in the internal zone of the Ungava orogen, northern Quebec. Part 1: tectonostratigraphic assemblages and their tectonic implications. Canadian Journal of Earth Sciences; volume 29, pages 746-764.1992Source


7 novembre 2018