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Ivitaruq Suite
Stratigraphic label: [ppro]ivi
Map symbol: pPivi

First published: 7 May 2018
Last modified: 23 October 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Translation of original French

 

 

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
 
None
 
Author: Charette and Beaudette, 2018
Age: Paleoproterozoic
Stratotype: Ivitaruq Lake, now Ivitaaqqut Lake, NTS sheet 35F13 (type locality)
Type area: NW part of the Ungava Peninsula
Geological province: Churchill Province
Geological subdivision: Ungava Orogen / Narsajuaq Lithotectonic Domain
Lithology: Felsic intrusive rocks
Category: Lithodemic
Rank: Suite
Status: Formal
Use: Active

 

 

Background

The Ivitaruq Suite was introduced by Charette and Beaudette (2018) to describe the late, undeformed felsic intrusions (NTS sheets 35K04, 35K08 and 35F13). A strip assigned to this unit has been extended in the NW part of the Sirmiq Lake area (Vanier and Lafrance, 2020). Ces intrusions were previously known in the Narsajuaq Lithotectonic Domain as biotite monzogranite veins (St-Onge and Lucas, 1992; St-Onge et al., 1992).

The unit takes its name from the previous Ivitaruq Lake, now Ivitaaqqut Lake, near of which one of the most important intrusions of this suite is located (sheet 35F13).

 

Description

Monzodiorite to monzonite of the Ivitaruq Suite is whitish, coarse grained and massive. Locally, it has a pinkish colour caused by hematitization. Ferromagnesian minerals form clusters or are evenly distributed in the matrix. Two facies were described in this unit. The first contains 10-20% mafic minerals and varies in grain size. The second contains 20-25% ferromagnesian minerals, has a speckled texture and contains diorite enclaves in diffuse contact that make up 10 to 15% of outcrops. Coarse granitic bands are observed in diffuse contact. Thin-section observations indicate that the main ferromagnesian minerals are hornblende and biotite and that the matrix is not recrystallized.

 

Thickness and Distribution

The Ivitaruq Suite intrusions form kilometre-sized plutons (1-12 km) that are spread NE of the Naujaat Shear Zone and SW of the Sugluk Shear Zone. They form oblong masses to the north, stocky ones to the south.

Dating

None.

Stratigraphic Relationship(s)

Late intrusions of the Ivitaruq Suite cut granoblastic granite of the Kuugaq Suite and banded tonalite of the Sainte-Hélène Complex. They are themselves cut by pegmatites.

Paleontology

Does not apply.

References

 

Publications Available Through SIGÉOM Examine

CHARETTE, B., BEAUDETTE, M. 2018. Geology of the Cape Wolstenholme Area, Ungava Orogen, Churchill Province, Southeast Ivujivik, Quebec, Canada. MERN. BG 2018-03, 1 plan.

VANIER, M.-A., LAFRANCE, I. 2020. Geology of the Sirmiq Lake Area, Ungava Orogen, Nunavik, Quebec, Canada. MERN. BG 2020-02, 1 plan.

Other Publications

ST-ONGE, M. R., LUCAS, S. B., PARRISH, R. R. 1992. 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. https://doi.org/10.1139/e92-064

ST-ONGE., M. R., LUCAS, S. B. 1992. New insight on the crustal structure and tectonic history of the Ungava Orogen, Kovik Bay and Cap Wolstenholme, Quebec. In Current Research, Part C, Canadian Shield. Geological Survey of Canada; Paper 92-1 C, pages 31-41. https://doi.org/10.4095/132842

Suggested Citation

Ministère de l’Énergie et des Ressources naturelles (MERN). Ivitaruq Suite. Quebec Stratigraphic Lexicon. http://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/suite-ivitaruq_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. melanie.beaudette@mern.gouv.qc.ca (redaction)

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

Revision(s)

Isabelle Lafrance, P. Geo., M.Sc. isabelle.lafrance@mern.gouv.qc.ca (redaction)

Mehdi A. Guemache, P. Geo., Ph.D. (coordination); Benoit Charette, P. Geo., M.Sc. (critical review); Simon Auclair, P. Geo., M.Sc. (editing); Céline Dupuis, P. Geo., Ph.D. (English version); André Tremblay (HTML editing). 

 
7 novembre 2018