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De Pas Granitic Suite
Stratigraphic label: [ppro]dep
Map symbol: pPdep

First published: 20 October 2016
Last modified: 1 August 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Translation of original French

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
 
pPdep5 Magnetic syenite and monzonite
pPdep4 Granite
pPdep3 Heterogeneous granite containing numerous enclaves
pPdep2 Porphyraceous granodiorite and quartz monzodiorite
pPdep2c Porphyraceous bluish quartz granodiorite and quartz monzodiorite
pPdep2b Magnetic porphyraceous granite and quartz monzonite
pPdep2a Granodiorite and quartz monzodiorite
pPdep1 Quartz diorite, diorite, monzodiorite and monzonite
pPdep1b Melanocratic monzonite and monzodiorite
pPdep1a Homogeneous quartz diorite and diorite
 
Author: Danis, 1991
Age: Paleoproterozoic
Stratotype: None
Type area: Rielle Lake (NTS sheet 24A03) and Tudor Lake (sheet 23P14) areas
Geological province: Churchill Province
Geological subdivision: George Lithotectonic Domain
Lithology: Potassic intrusive rocks
Category: Lithodemic
Rank: Suite
Status: Formal
Use: Active

Background

The De Pas Granitic Suite was defined by Danis (1991) and subdivided into informal units based on the dominant lithology. This suite, like the De Pas Charnockitic Suite, is part of the De Pas Supersuite, a polyphase syntectonic intrusion that extends >440 km in a N-S to NNW-SSE orientation in the George Lithotectonic Domain (Charette et al., 2018).

A regional compilation by geologists of the Ministère in 2003 (MRNF, 2010a-c) subdivided the De Pas Granitic Suite, then referred to as the “De Pas Batholith”, into six informal units (pPdep1 to pPdep6). Hammouche et al. (2011) subsequently redefined several units and introduced a seventh (pPdep7). Simard et al. (2013) introduced an eighth unit (pPdep8) of small syenite and monzonite intrusions. Only informal units pPdep3, pPdep4, pPdep5, pPdep7 and pPdep8 were recognized in the 1:250 000 mapping work conducted by the Ministère between 2011 and 2016. As part of the Southeastern Churchill Province regional synthesis (SECP; Lafrance et al., 2018), the eight known informal units were reduced to five (pPdep1 to pPdep5), as illustrated in the table below.

Revised Units and Subunits Previous Units and Subunits Reference(s)
pPdep1 pPdep3 MRNF, 2010b, c; Hammouche et al., 2011; Lafrance et al., 2016
F2d Danis, 1988, 1991; Bourque, 1991
E2a Van der Leeden, 1995
pPdep1a E2b Van der Leeden, 1995
pPdep1b
pPdep2 pPdep4 MRNF, 2010a-c; Hammouche et al., 2011; Simard et al., 2013; Lafrance et al., 2014, 2015, 2016; Charette et al., 2016
F2c Danis, 1988, 1991; Owen, 1989; Bourque, 1991
pPdep6 MRNF, 2010b, c
F2a Owen, 1989; van der Leeden, 1994
pPdep2a
pPdep2b pPdep4a Lafrance et al., 2015, 2016
pPdep7 MRNF, 2010b; Hammouche et al., 2011
pPdep2c
pPdep3 pPdep5a Simard et al., 2013; Lafrance et al., 2014, 2015, 2016
pPdep2 MRNF, 2010b, c
F2e Danis, 1988, 1991; Owen, 1989; Bourque, 1991
pPdep4 pPdep5 MRNF, 2010a-c; Hammouche et al., 2011; Simard et al., 2013; Lafrance et al., 2014, 2015, 2016; Charette et al., 2016
pPdep1 MRNF, 2010b, c
F2f Bourque, 1991
pPdep5 pPdep8 Simard et al., 2013; Lafrance et al., 2016

 

Description

The De Pas Granitic Suite, consisting mainly of various biotite ± hornblende potassic intrusive phases, is the main unit of the De Pas Supersuite. The rock is intermediate to felsic in composition, and locally porphyraceous. It is divided into five units: 1) quartz diorite, diorite, monzodiorite and monzonite (pPdep1); 2) porphyraceous granodiorite and quartz monzodiorite (pPdep2); 3) heterogeneous granite containing numerous enclaves (pPdep3); 4) biotite granite (pPdep4); and, 5) syenite and monzonite (pPdep5).

Rocks of unit pPdep2 are intruded to varying degrees by the different phases of unit pPdep4 as subconformable layers and centimetre to metre-wide dykes. The pPdep4 unit also includes decimetric and metric enclaves of unit pPdep2 porphyraceous granodiorite.

The De Pas Granitic Suite rocks are commonly affected by the Rivière George Shear Zone (ZCrge), resulting in the development of mylonitic foliation, K-feldspar porphyroclasts and quartz bands, accompanied by more or less intense hematite, epidote and chlorite alteration in platings and veinlets.

 

De Pas Granitic Suite 1 (pPdep1): Quartz Diorite, Diorite, Monzodiorite and Monzonite

De Pas Granitic Suite 1a (pPdep1a): Homogeneous Quartz Diorite and Diorite

Subunit pPdep1a represents an intrusive phase that varies from quartz diorite to diorite and is characterized by a low phenocrystal content (<5%). It is regularly observed in outcrops with porphyraceous granodiorite and quartz monzodiorite of unit pPdep2. The contact between these different lithologies may be sharp, but it is generally gradual and corresponds to the gradual disappearance of K-feldspar phenocrystals. In other places, subrounded diorite xenoliths containing some microcline phenocrystals (pPdep1a) are also observed in porphyraceous rocks of unit pPdep2 (including subunits pPdep2b and pPdep2c). In some cases, quartz diorite is the dominant phase and may have been drawn on the map (pPdep1a).

pPdep3

Rocks of subunit pPdep1a are homogeneous, medium to fine grained, even grained, grey and massive to weakly foliated. They contain 15 to 25% brown biotite and green hornblende, as well as a significant amount of accessory minerals including sphene, allanite, apatite, zircon and opaque minerals. In some areas, the rock shows moderate chloritization and epidotization.

Quartz diorite is locally intruded by leucocratic felsic to intermediate material, giving the rock a heterogeneous and locally brecciated appearance. The leucocratic material is in sharp contact with quartz diorite, which in some places forms angular to subrounded enclaves. Locally, these injections produce banding parallel to the regional fabric. Danis (1988, 1991) proposes that brecciated zones were formed by the fracturing of quartz diorite resulting from a surge of slightly more felsic magma.

 

De Pas Granitic Suite 1b (pPdep1b): Melanocratic Monzonite and Monzodiorite

A few small melanocratic monzonite and monzodiorite lenses associated with quartz diorite have been grouped in subunit pPdep1b. The contact between these two lithologies was not observed during 1:250 000 mapping campaigns carried out by the Ministère since the summer of 2011. However, van der Leeden (1995) describes this subunit as transitional and gradual metric to decametric layers in quartz diorite. These rocks, dark grey to black and fine-grained, include rounded mafic aggregates of biotite and hornblende with clinopyroxene cores up to 1.5 cm locally. K-feldspar is in some places concentrated in centimetric bands. Many accessory minerals are observed in thin section, the main percentages of which are epidote and sphene.

 

De Pas Granitic Suite 2 (pPdep2): Porphyraceous Granodiorite and Quartz Monzodiorite

pPdep4

Unit pPdep2 groups a variety of phases typically characterized by a positive magnetic signature. It consists largely of granodiorite and quartz monzodiorite, but also includes monzogranite, syenogranite and quartz syenite. Pale to whitish pink microcline occurs as euhedral phenocrystals (1-6 cm, locally up to 10 cm), but is also present in the coarse to medium-grained matrix. Phenocrystals, which account for 5 to 25% of the rock, are locally aligned but generally show a random orientation. The rock is pinkish grey in fresh exposure and pinkish white in alteration patina. It is massive to weakly foliated except in mylonitic deformation zones associated with large NW-SE to N-S shear zones. On outcrops, fine-grained monzodiorite is also present, containing ~5% of 3 to 7 mm microcline phenocrystals. This monzonite is found in partially gradual or irregular contacts, associated with reaction rims, or as enclaves in porphyraceous rocks. These observations seem to indicate a mostly contemporary development of these two lithologies.

Ferromagnesian minerals (15-25%), which consist of brown to green biotite regularly accompanied by green hornblende, form millimetric to centimetric clusters. A significant amount of accessory minerals (2-5%), including sphene, epidote-surrounded allanite, magnetite and apatite are associated with these clusters. Clinopyroxene (<5%) was also observed locally, as well as muscovite, carbonates and zircon, which commonly occurs as inclusions in biotite. Rocks are variably altered; chloritization of biotite and formation of sericite, muscovite, epidote, carbonate and fine hematite inclusions or lamellae in feldspar are observed. Phenocrystals contain rounded inclusions of quartz, plagioclase and biotite. In thin section, the rock shows well-preserved igneous textures, some recrystallization and many myrmekites bordering phenocrystals. Quartz grains form a mosaic of crystals showing strong undulatory extinction.

De Pas Granitic Suite 2a (pPdep2a): Granodiorite and Quartz Monzodiorite

Some zones of granodiorite and quartz monzodiorite do not contain K-feldspar phenocrystals and have been distinguished from the porphyraceous phase when they were of sufficient size. Zones grouped in this subunit generally show diffuse contact with porphyraceous rocks and appear to be cogenetic with them. Subunit pPdep2a consists mainly of medium-grained, massive to foliated granodiorite and monzogranite. K-feldspar is distributed heterogeneously and locally forms coarser crystals (0.5-1 cm).

 

De Pas Granitic Suite 2b (pPdep2b): Magnetic Porphyraceous Granite and Quartz Monzonite

In the Henrietta Lake and Brisson Lake areas, porphyraceous potassic intrusive rocks that form N-S-to NW-SE oriented elliptical intrusions associated with very strong positive aeromagnetic anomalies were grouped into subunit Pdep2b (Lafrance et al., 2015, 2016). This subunit is located along the ZCrge. In these areas, the rock is distinguished by its dark pink and black speckled appearance caused by the presence of 25 to 50% euhedral near joints, and microcline crystals 0.3-3 cm long (locally up to 5 cm long). Between microcline grains, the matrix is finely recrystallized, especially at the edge of phenocrystals. Ferromagnesian minerals, mainly biotite, are slightly less abundant (8-20%) than in unit pPdep2 and form clusters with the same accessory minerals found elsewhere in this unit. Two intrusions of 2 to 3 km by 7-8 km at the eastern boundary of the De Pas Supersuite in the Bonaventure Lake area (Hammouche et al., 2011) are also attributed to this highly magnetic facies. In this area, subunit pPdep2b consists of porphyraceous, mainly intermediate intrusive rocks (monzonite and quartz monzonite) and includes, in smaller proportions, granite and granodiorite.

 

De Pas Granitic Suite 2c (pPdep2c): Porphyraceous Bluish Quartz Granodiorite and Quartz Monzodiorite

At the far west of the De Pas Supersuite, in the Henrietta Lake area, a portion of the De Pas Granitic Suite characterized by a negative magnetic signature is designated as subunit pPdep2c. This subunit consists of granodiorite and quartz monzodiorite, distinguished by the presence of bluish quartz, responsible for the darker shade of the rock, and by the peculiar habitus of K-feldspar, which occurs exclusively as euhedral phenocrystals ranging in length from 0.5 to 13 cm (mainly ~2-5 cm). Phenocrystals are not distributed uniformly and magmatic layering has been observed over several outcrops. This layering is expressed by alternating decimetric layers consisting mainly of microcline phenocrystals (>75%) overlain by layers becoming less and less rich until they are practically non-existent. A magmatic foliation is marked by the alignment of phenocrystals. Rapakivic textures were also observed locally in subunit pPdep2c. In thin section, the rock shows some initial recrystallization, especially around the edges of microcline phenocrystals.

 

De Pas Granitic Suite 3 (pPdep3): Heterogeneous Granite Containing Numerous Enclaves

pPdep5a

Unit pPdep3 corresponds to very heterogeneous zones where potassic intrusive rocks contain nearly 50% of various enclaves, mainly gneiss, migmatite and diorite. These pinkish grey to light pink intrusive rocks are heterogeneous, medium to coarse grained, and vary in composition from granitic to granodioritic, locally tonalitic. High assimilation of enclaves by granite gives the rock a marbled texture or results in irregular and undulating banding locally marked by discontinuous laminae of ferromagnesian minerals. In more homogeneous areas, unit pPdep3 potassic intrusive rocks are leucocratic and contain 5 to 10% ferromagnesian minerals. The contact between this subunit and gneiss of the Saint-Sauveur Complex is gradual, with the gneiss showing fewer and fewer intrusions as they move away from the De Pas Supersuite.

 

De Pas Granitic Suite 4 (pPdep4): Granite

pPdep5

Unit pPdep4 consists of several homogeneous potassic intrusive phases intruding into each other, locally giving a heterogeneous appearance to outcrops. There are three main intrusive phases, none of which can be mapped at the scale of our work: 1) monzogranite containing 8 to 15% ferromagnesian minerals; 2) granite containing 5 to 10% biotite; and, 3) white granite containing <5% ferromagnesian minerals. Monzogranite and biotite granite are medium grained and massive to slightly foliated. Brown to greenish biotite is the main ferromagnesian mineral, but green hornblende is also found in small amounts, particularly in monzogranite. These two phases are primarily distinguished by their colour, monzogranite being grey, locally pink and biotite granite light pink to pinkish grey (lighter than monzogranite). In both cases, thin sections reveal a relatively well-preserved igneous texture associated with moderate to high recrystallization at grain edges. There are also myrmekitic and anti-perthitic textures, as well as undulatory extinction of quartz. Feldspar shows some initial alteration with the formation of sericite, epidote and carbonate. Accessory minerals, especially epidote and allanite, are abundant (1-4%) and often accompanied by small clusters of ferromagnesian minerals scattered in the rock. They also include sphene, apatite, opaque minerals, zircon as inclusions in biotite and, more locally, fluorite.

Pink leucogranite is massive, medium grained to pegmatitic, and intrudes as centimetric to decimetric layers and dykes in the other granitic phases of unit pPdep4. At this time, the majority of granitic rocks observed within the De Pas Supersuite envelope have been assigned to unit pPdep4. However, it is likely that some of these rocks, particularly leucogranite, represent a much later unit similar to the Dancelou Suite.

 

De Pas Granitic Suite 5 (pPdep5): Magnetic Syenite and Monzonite

pPdep8

Unit pPdep5 consists of nine hectometric to kilometric syenite and monzonite intrusions located in the western portion of the De Pas Granitic Suite. The rock is magnetic, homogeneous, granular, massive to foliated and dark pink or black and pink speckled. It contains 15 to 25% biotite and clinopyroxene, the latter mineral being variably replaced by hornblende. In thin section, some initial recrystallization at grain edges, numerous myrmekitic and perthitic textures in feldspar and, more locally, ferromagnesian minerals with skeletal textures are observed. Accessory minerals, mainly opaque minerals, apatite, sphene, epidote, allanite and zircon, are abundant and generally close to ferromagnesian minerals.

 

Thickness and Distribution

The De Pas Granitic Suite is present throughout the length of the De Pas Supersuite, ~440 km along a N-S to NNW-SSE axis. It has been recognized in the Recouet Lake (Danis, 1988), Leif Lake (Owen, 1989), Raude Lake (Danis, 1991), Mina Lake (Bourque, 1991), Hutte Sauvage Lake (van der Leeden, 1994), Mistinibi Lake (van der Leeden, 1995), Bonaventure Lake (Hammouche et al., 2011), Kuujjuaq and Ungava Bay (Simard et al., 2013), Saffray Lake (Lafrance et al., 2014), Henrietta Lake (Lafrance et al., 2015), Brisson Lake (Lafrance et al., 2016) and Jeannin Lake (Charette et al., 2016) areas. In the southern portion of the De Pas Supersuite, in the Advance Lake (sheet 23P07; Danis, 1991) and Bonaventure Lake (sheet 23P02; Hammouche et al., 2011) areas, the De Pas Granite Suite is smaller than in the north and extends for less than 10 km between the ZCrge in the east and the De Pas Charnockitic Suite in the west. De Pas Supersuite units are mostly inside the George Lithotectonic Domain. However, they were also observed inside the Baleine Lithotectonic Domain, located just to the west. Rocks of units pPdep2 and pPdep4 are the dominant lithologies, covering 4432 km2 and 3160 km2 respectively. Units and subunits pPdep1a (138 km2), pPdep1b (1 km2), pPdep2a (873 km2), pPdep2b (928 km2), pPdep2c (902 km2), pPdep3 (1182 km2) and pPdep5 (40 km2) cover smaller areas.

Dating

Several dates indicate that the main unit of the De Pas Granitic Suite (pPdep2) was probably emplaced in several episodes spread over a period of nearly 50 Ma (1862-1813 Ma). Unit pPdep4, considered the latest of the De Pas Supersuite, yielded ages between 1817 Ma and 1805 Ma, confirming its emplacement towards the end of the magmatic episode.

Unit Isotopic System Mineral Crystallization Age (Ma) (+) (-) Inherited Age (Ma)

(+)

(-) Metamorphic Age (Ma) (+) (-) Reference(s)
pPdep2 U-Pb Zircon 1813.4 3.1 3.1 Jean David, pers. comm. (14LP2008)
pPdep2a U-Pb Zircon 1861.7 4.7 4.7 Jean David, pers. comm. (14IL3158)
pPdep2 U-Pb Zircon 1820 6 6 Davis et al., 2017 (13MP083)
pPdep2b U-Pb Zircon 1840 6 6 1804 6 6 David Corrigan, pers. comm; sample 13SS7043-A
pPdep2c U-Pb Zircon 1843 15 15 1773 7 7 Corrigan et al., 2018; sample 13SB4053-A
pPdep4 U-Pb Zircon 1817 5 5 2600 Corrigan et al., 2018; sample 13LP2108-A
pPdep4

U-Pb

Zircon 1805 2 2 Isnard et al., 1998
pPdep2 U-Pb Zircon 1823 5 5 2670 James et al., 1996
pPdep4 U-Pb Zircon 1810 3 3 James and Dunning, 2000
pPdep2a U-Pb Zircon 1825 2 2 Dunphy and Skulski, 1996
pPdep1a U-Pb Zircon 1840 (preliminary) Dunphy and Skulski, 1996

Stratigraphic Relationship(s)

The De Pas Granitic Suite rocks cut gneiss of the Saint-Sauveur Complex. They also contain several enclaves of these gneiss, as well as migmatite from the Guesnier Complex, diorite, gabbro and volcano-sedimentary rocks of the Tunulic Complex. Field relationships indicate that the contact with the De Pas Charnockitic Suite is transitional.

Paleontology

Does not apply.

References

Author(s) Title Year of Publication

Hyperlink (EXAMINE or

Other)

MRNF CARTE(S) GÉOLOGIQUE(S) DU SIGEOM – feuillet 23I. CG SIGEOM23I, 8 plans. 2010a CG SIGEOM23I
MRNF CARTE(S) GÉOLOGIQUE(S) DU SIGEOM – feuillet 23P. CG SIGEOM23P, 16 plans.

2010b

CG SIGEOM23P
MRNF CARTE(S) GÉOLOGIQUE(S) DU SIGEOM – feuillet 24A. CG SIGEOM24A, 1 plan. 2010c CG SIGEOM24A
BOURQUE, Y. Géologie de la région du lac Mina (Territoire-du-Nouveau-Québec). Ministère de l’Énergie et des Ressources, Québec; ET 88-08, 48 pages, 4 plans. 1991 ET 88-08
CHARETTE, B. – LAFRANCE, I. – MATHIEU, G. Géologie de la région du lac Jeannin (SNRC 24B). Ministère de l’Énergie et des Ressources naturelles, Québec. 2016

Electronic geological report

CHARETTE, B. – LAFRANCE, I. – VANIER, M.-A. George Lithotectonic Domain, Southeastern Churchill Province, Nunavik, Quebec, Canada: Geological Synthesis. Ministère de l’Énergie et des Ressources naturelles, Québec. BG 2018-11. 2018 BG 2018-11
CORRIGAN, D. – WODICKA, N. – McFARLANE, C. – LAFRANCE, I. – VAN ROOYEN, D. – BANDYAYERA, D. – BILODEAU, C. Lithotectonic framework of the Core Zone, Southeastern Churchill Province Geoscience Canada; volume 45, pages 1-24. 2018
 
Source
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DAVIS, D. – LAFRANCE, I. – GOUTIER, J. – TALLA TAKAM, F. – BANDYAYERA, D. – GIGON, J. Datations U-Pb dans les provinces de Churchill et du Supérieur effectuées au JSGL en 2013-2014. Ministère de l’Énergie et des Ressources naturelles, Québec. 2017 RP 2017-01
DUNPHY, J.M. – SKULSKI, T. Petrological zonation across the De Pas Batholith: a tilted section through a continental arc? In Eastern Canadian Shield Onshore–Offshore (ECSOOT) Transect Meeting 1996 (Wardle R.J. and Hall, J., editors). The University of British Columbia, Lithoprobe Secretariat; Report 57, pages 44-58. 1996
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JAMES, D.T. – DUNNING, G.R. U-Pb geochronological constraints for Paleoproterozoic evolution of the Core Zone, southeastern Churchill Province, northeastern Laurentia. Precambrian Research; volume 103, pages 31-54. 2000 Source
JAMES, D.T. – CONNELLY, J.N. – WASTENEYS, H.A. – KILFOIL, G.J. Paleoproterozoic lithotectonic divisions of the southeastern Churchill Province, western Labrador. Canadian Journal of Earth Sciences; volume 33, pages 216-230. 1996 Source
ISNARD, H. – PARENT, M. – BARDOUX, M. – DAVID, J. – GARIÉPY, C. – STEVENSON, R.K. U-Pb, Sm–Nd and Pb–Pb isotope geochemistry of the high-grade gneiss assemblages along the southern shore of Ungava Bay. In Wardle R.J., Hall, J. (Eds.), Eastern Canadian Shield Onshore–Offshore (ECSOOT), Transect Meeting, 1998. The University of British Columbia, Lithoprobe Secretariat, Report 68, pp. 67-77. 1998
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LAFRANCE, I. – BANDYAYERA, D. – CHARETTE, B. – BILODEAU, C. – DAVID. J. Géologie de la région du lac Brisson (SNRC 24A). Ministère de l’Énergie et des Ressources naturelles, Québec; RG 2015-05, 61 pages. 2016 RG 2015-05
LAFRANCE, I. – BANDYAYERA, D. – BILODEAU, C. Géologie de la région du lac Henrietta (SNRC 24H). Ministère des Ressources naturelles, Québec; RG 2015-01, 62 pages. 2015 RG 2015-01
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SIMARD, M. – LAFRANCE, I. – HAMMOUCHE, H. – LEGOUIX, C. Géologie de la région de Kuujjuaq et de la Baie d’Ungava (SNRC 24J et 24K). Ministère des Ressources naturelles, Québec; RG 2013-04, 60 pages. 2013 RG 2013-04
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20 août 2020