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Kuugaq Suite
Stratigraphic label: [ppro]kug
Map symbol: pPkug

First published: 26 April 2018
Last modified:

 

 

 

 

 

 

 

 

 

 

Translation of original French

 

 

 

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
 
pPkug1 Granoblastic even grained granite, foliated to banded

 

 
Author:Charette and Beaudette, 2018
Age:Paleoproterozoic
Reference section: 
Type area: 
Geological province:Churchill Province
Geological subdivision:Ungava Orogen / Narsajuaq Arc
Lithology:Potassic intrusive igneous rock
Type:Lithodemic
Rank:Suite
Status:Formal
Use:Active

 

 

 

Background

The Kuugaq Suite was introduced by Charette and Beaudette (2018) to distinguish well-foliated, even-grained and partially recrystallized granite lithologies from late, weakly foliated to massive potassic intrusions of the Narsajuaq Arc. The unit’s name is taken from the Kuugaq River located on NTS sheet 35L01.

 

 

Description

 

 

Kuugaq Suite 1 (pPkug1): Granoblastic Even Grained Granite, Foliated to Banded

 

Granite is fine to medium grained, even grained and locally granoblastic. It is characterized by a well-developed foliation or banded appearance, and a small proportion of mafic minerals. It contains 2-5% diorite or quartz diorite enclaves. Hematitization is usually observed and results in either a characteristic pinkish colour or a pinkish diffuse banding. K-feldspar proportion varies from 25 to 40% and is concentrated mainly in millimetric to centimetric, discontinuous bands in diffuse contact in the granite matrix. These bands typically account for 15 to 20% of the lithology. Foliation is marked by biotite, which forms thin millimetric horizons and makes up between 5 and 15% of the rock. Accessory minerals observed in thin section are hornblende, zircon, apatite, sphene and, locally, chlorite.

 

 

Thickness and Distribution

Unit pPkug1 forms kilometric zones scattered throughout the Narsajuaq Arc. These zones are elongated following the east-west regional foliation and are locally folded.

Dating

None.

Stratigraphic Relationship(s)

The Kuugaq Suite granite is cut by granitoid intrusions and plutons of the Sanningajualuk Suite (pPsnn) and locally occurs as enclaves within them. It is generally close to large masses of foliated charnockite of the Siurartuuq Suite (pPsir1). However, the contact between these two units was not observed in the field. The contact is sharp with mesocratic hypersthene gabbronorite and diorite of the Pingasualuit Complex (pPpgs1).

Paleontology

Does not apply.

References

Author(s)TitleYear of PublicationHyperlink (EXAMINE or Other)
CHARETTE, B. – BEAUDETTE, M.Géologie de la région du cap Wolstenholme, Orogène de l’Ungava, Province de Churchill, sud-est d’Ivujivik, Québec, Canada. Ministère de l’Énergie et des Ressources naturelles, Québec.2018Bulletin géologiQUE

 

 

9 novembre 2018