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

First published: 10 May 2018
Last modified: 23 October 2020

 

 

 

 

   DISCLAIMER: This English version is translated from the original French. In case of any discrepancy, the French version shall prevail. 

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
 
None
 
Author(s): Charette and Beaudette, 2018
Age: Mesoproterozoic
Stratotype: None
Type area: NTS sheets 35K04 and 35K05
Geological province: Churchill Province
Geological subdivision: Ungava Orogen / Narsajuaq Lithotectonic Domain
Lithology: Mafic intrusive rock
Category: 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 Lithotectonic Domain (previously 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 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 Lithotectonic Domain.

Paleontology

Does not apply.

References

Publications available through SIGÉOM Examine

CHARETTE, B., BEAUDETTE, M. 2018. Geology of the Cape Wolstenholme region, Ungava Orogen, Churchill Province, Southeast Ivujivik, Quebec, Canada. MERN. BG 2018-03, 2 plans.

Suggested Citation

Ministère de l’Énergie et des Ressources naturelles (MERN). Nauyok Suite. Quebec Stratigraphic Lexicon. http://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-de-churchill/suite-de-nauyok_en [accessed on Day Month Year].

Contributors

First publication

Benoit Charette, P. Geo., M.Sc. benoit.charette@mern.gouv.qc.ca; Mélanie Beaudette, GIT, B.Sc. mélanie.beaudette@mern.gouv.qc.ca (redaction)

Mehdi A. Guemache, P. Geo., Ph.D. (coordination); Mélina Langevin (critical review); Simon Auclair, P. Geo., M.Sc. (editing); Céline Dupuis, P. Geo., Ph.D. (English version); Yan Carette (HTML editing).

 
9 novembre 2018