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

First published: 7 May 2018
Last modified:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Translation of original French

 

 

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
 
pPivi1 Massive, coarse-grained monzodiorite to monzonite
 
Author:Charette and Beaudette, 2018
Age:Paleoproterozoic
Reference section: 
Type area:NTS sheets 35K04, 35F13 and 35K08
Geological province:Churchill Province
Geological subdivision:Ungava Orogen / Narsajuaq Arc
Lithology:Late felsic intrusive rocks
Type:Lithodemic
Rank:Suite
Status:Formal
Use:Active

 

 

Background

The Ivitaruq Suite, whose namesake lake is located near one of the most important intrusions of this unit (NTS sheet 35F13), was introduced by Charette and Beaudette (2018) to describe the late, undeformed felsic intrusions. They were previously known in the Narsajuaq Arc as biotite monzogranite veins (St-Onge and Lucas, 1992; St-Onge et al., 1992).

Description

Ivitaruq Suite 1 (pPivi1): Massive, Coarse-Grained Monzodiorite to Monzonite

Monzodiorite to monzonite of the Ivitaruq Suite is whitish, coarse grained and massive. Locally, it has a pinkish colour caused by hematitization. Mafic minerals form clusters or are evenly distributed in the matrix. Two facies were described in this unit. The first contains 10 to 20% mafic minerals and varies in grain size. The second contains 20 to 25% mafic 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 mafic 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 northeast of the Naujaat Shear Zone and southwest of the Sugluk Suture. 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 (pPkug1) and banded tonalite of the Sainte-Hélène Complex (pPshn2). They are themselves cut by pegmatites.

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
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
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. In: Current Research, Part C, Canadian Shield. Geological Survey of Canada; Paper 92-1 C, pages 31-41. 1992Source

 

7 novembre 2018