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Nauyok Suite
Stratigraphic label: [mpro]yok
Map symbol: mPyok

First published: 10 May 2018
Last modified:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Translation of original French

 

 

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
None
 
Author:Charette and Beaudette, 2018
Age:Mesoproterozoic
Reference section: 
Type area:NTS sheets 35K04 and 35K05
Geological province:Churchill Province
Geological subdivision:Ungava Orogen / Narsajuaq Arc
Lithology:Mafic intrusive rock
Type:Lithodemic
Rank:Suite
Status:Formal
Use:Active

 

 

Background

The Nauyok Suite was introduced by Charette and Beaudette (2018) to describe the late, undeformed mafic intrusions that cut other lithologies in the Narsajuaq Arc. These intrusions were previously assigned to the Younger plutonic suite of the Narsajuaq Arc (pPNAR2) described by St-Onge and Lucas (1992) and St-Onge et al. (1992).

Description

The Nauyok Suite includes several small intrusions dispersed into the Narsajuaq Arc domain. These intrusions were grouped in a suite to express, on the one hand, their common cross-cutting relationship with other geological units of the arc and, on the other hand, their similar composition. The majority consists of massive clinopyroxene norite with subophitic texture, and are typically white and green. The plagioclase is locally beige to pinkish, possibly caused by saussuritization and hematitization. In fresh exposure, clinopyroxene norite is dark greenish. In some intrusions, greenish grey diffuse zones correspond to a gabbroic composition (loss of orthopyroxene); however, these zones are secondary. In thin section, the subophitic texture is well preserved and mafic minerals are concentrated in clusters. They mainly include orthopyroxene, clinopyroxene and opaque minerals. Mafic minerals are chloritized.

Thickness and Distribution

The Nauyok Suite consists of small one to three-kilometre oval intrusions scattered in NTS sheets 35K04 and 35K05.

Dating

None.

Stratigraphic Relationship(s)

Clinopyroxene norite of the Nauyok Suite generally occurs in all the outcrops visited. It is intrusive into Paleoproterozoic units of the Narsajuaq Arc.

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