Nuvilic Formation
Stratigraphic label: [ppro]nu
Map symbol: pPnu

First published: 9 February 2016
Last modified:












Translation of original French

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
pPnu2 Limestone, dolomitic limestone
pPnu1 Sandstone, siltstone
Author: Lamothe, 1994
Age: Paleoproterozoic
Reference section: None
Type area: Chukotat Lake area (NTS sheet 35G05)
Geological province: Churchill Province
Geological subdivision: Ungava Orogen / Ungava Trough / Southern Domain
Lithology: Volcano-sedimentary rocks
Type: Lithostratigraphic
Rank: Formation
Status: Formal
Use: Active


This unit was named by Lamothe (1994) to describe a sedimentary bed at the top of the Povungnituk Group. It was previously a member of the Beauparlant Subgroup, which is now reduced to the rank of formation (Moorhead, 1989, 1996a, b).


The Nuviliq Formation is an allochthonous assemblage of sandstone, siltstone, limestone, dolomitic limestone and volcaniclastics forming the upper part of the Povungnituk Group, in the Southern Domain. Siltstone represents the unit’s most abundant lithology. Phyllite and slate beds are interstratified between siltstone beds. Several mafic to ultramafic sills of the Lac Esker Suite intrude into sedimentary rocks. The central portion of the Nuvilic Formation has an abundance of decimetric beds of fine-grained or lapilli tuff, likely of epiclastic nature (Moorhead, 1996a). Near the contact with the Chukotat Group, there is a concentration of disseminated to massive pyrrhotite and pyrite mineralization in fine-grained sedimentary beds. Massive sulphide layers, locally brecciated, likely synchronous to sedimentation, contain anomalous values in zinc, copper, nickel and light rare earths (Giovenazzo et al., 1991). Concentrations of light rare earths are presumably due to the detrital input associated with the erosion of the Cécilia Formation’s alkaline volcanic edifice (Giovenazzo et al., 1991).

Nuvilic Formation 1 (pPnu1): Sandstone, Siltstone

Little information is available. 

Nuvilic Formation 2 (pPnu2): Limestone, Dolomitic limestone

Little information is available.

Thickness and Distribution

The Nuvilic Formation extends laterally over 100 km in the central part of the Southern Domain.



Stratigraphic Relationship(s)

The Nuvilic Formation structurally overlies the Cécilia Formation in the central part of the Southern Domain. Petrographic and lithochemical evidence suggests that the Nuvilic Formation represents distal accumulation in a relatively deep environment of detrital sediments from the erosion of the Cécilia Formation and ash deposits resulting from the latter’s volcanism (Moorhead, 1996a; Giovzzenao et al., 1991). If this is the case, the Nuvilic Formation would be contemporary with the Cécilia Formation dated 1958.6 +3.1/-2.7 Ma (Parrish, 1989). The contact between the Nuvilic Formation and the overlying Chukotat Group corresponds to a thrust fault (Moorhead, 1996a). 


Does not apply.


Author(s) Title Year of Publication Hyperlink (EXAMINE or Other)
GIOVENAZZO, D. – PICARD, D. – TREMBLAY, C. – LEFEBVRE, C. Gîtologie de la partie occidentale de la Fosse de l’Ungava: Régions des lacs Chukotat, Vanasse, Hubert et Lessard. Ministère de l’Énergie et des Ressources, Québec; MB 91-23, 102 pages, 3 cartes. 1991 MB 91-23
LAMOTHE, D. Lexique stratigraphique de l’Orogène de l’Ungava. Ministère des Ressources naturelles, Québec; DV 2007-03, 62 pages. 2007
LAMOTHE, D. Géologie de la Fosse de l’Ungava, Nouveau-Québec. In Géologie du Québec (Hocq, M., coordonnateur). Ministère des Ressources naturelles, Québec; MM 94-01, pages 67–74. 1994 MM 94-01
MOORHEAD, J. Géologie de la région du lac Hubert, Fosse de l’Ungava. Ministère de l’Énergie et des Ressources, Québec; ET 91-06, 120 pages. 1996a
PARRISH, R.R. U-Pb geochronology of the Cape Smith Belt and Sugluk block, northern Quebec. Geoscience Canda; volume 16, pages 126–130. 1989 Source
11 novembre 2019