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TitleGéologie et structure de la roche en place / Bedrock geology and structure
DownloadFree download (whole publication) (zip 2390025 KB)
AuthorSt-Onge, M R; Baragar, W R A; Henderson, I
SourceAtlas géoscientifique numérique, ceinture de Cape Smith et environs, péninsule d'Ungava, Québec-Nunavut/Digital geoscience atlas of the Cape Smith Belt and adjacent domains, Ungava Peninsula, Quebec-Nunavut; by St-Onge, M R; Lamothe, D; Henderson, I; Ford, A; Geological Survey of Canada, Open File 5117, 2007.,
Documentopen file
Lang.English; French
Map Info.geological, géologique - bedrock geology/roches mères, 1:500,000
MediaDVD; digital; on-line
RelatedThis publication is contained in St-Onge, M R; Lamothe, D; Henderson, I; Ford, A; St-Onge, M R; Lamothe, D; Henderson, I; Ford, A; (2007). Atlas géoscientifique numérique, ceinture de Cape Smith et environs, péninsule d'Ungava, Québec-Nunavut, Geological Survey of Canada, Open File 5117
RelatedThis publication contains St-Onge, M R; Henderson, I; Baragar, W R A; St-Onge, M R; Henderson, I; Baragar, W R A; (2006). Géologie, ceinture de Cape Smith et environs, péninsule de l'Ungava, Québec-Nunavut, Geological Survey of Canada, Open File 4930
File formatreadme
File formatdbf (ESRI® ArcReader(TM) v.9.1, is included / est fourni); prj (ESRI® ArcReader(TM) v.9.1, is included / est fourni); sbn (ESRI® ArcReader(TM) v.9.1, is included / est fourni); shp (ESRI® ArcReader(TM) v.9.1, is included / est fourni); txt; xml; pdf
ProvinceNunavut; Quebec
NTS25E/03; 25E/04; 25E/05; 25E/06; 25E/11; 25E/12; 25E/13; 25E/14; 35C; 35D/01; 35D/02; 35D/07; 35D/08; 35D/09; 35D/10; 35D/15; 35D/16; 35E/01; 35E/02; 35E/07; 35E/08; 35E/09; 35E/10; 35E/15; 35E/16; 35F; 35G; 35H; 35I; 35J; 35K; 35L/01; 35L/02; 35L/07; 35L/08; 35L/09; 35L/10; 35L/15; 35L/16
AreaPéninsule d'Ungava; Ungava Peninsula; Cape Smith; Cap Wolstenholme; Cap de Nouvelle-France; Joy Bay
Lat/Long WENS-79.0000 -71.0000 63.0000 60.0000
Subjectsregional geology; stratigraphy; structural geology; Archean; compilation; bedrock geology; lithology; structural features; mineral assemblages; tectonostratigraphic zones; hydrography; mineral exploration; environmental studies; land use; regional planning; igneous rocks; plutonic rocks; volcanic rocks; metamorphic rocks; sedimentary rocks; orthogneisses; felsic rocks; clastics; volcaniclastics; carbonatites; tholeiites; basalts; rhyolites; komatiites; rifts; sutures; ophiolites; obduction; magmatic arcs; terranes; tectonic elements; gneisses; diorites; tonalites; andesites; island arcs; monzodiorites; granites; diabase dykes; Cape Smith Belt; Trans-Hudson Orogen; Superior Province; Superior Craton; Povungnituk Group; Chukotat Group; Bergeron suture; Superior Margin; Churchill Plate; Watts Group; Spartan Group; Parent Group; Narsajuaq arc; spatial data; calc-alkaline rocks; forearcs; continental arcs; Precambrian; Proterozoic
Natural Resources Canada Library - Ottawa (Earth Sciences)
Canada-Nunavut Geoscience Office
Geological Survey of Canada (Atlantic)
Natural Resources Canada library - Québec (Earth Sciences)
Natural Resources Canada library - Calgary (Earth Sciences)
Natural Resources Canada library - Vancouver (Earth Sciences)
ProgramMinistère des Ressources naturelles et de la Faune du Québec, Géologie Québec, Programme de financement
LinksMetadata - Métadonnées
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Released2007 01 29
AbstractOF 4930 - This Open file contains: (1) a geological bedrock compilation (1:500 000 scale); (2) planar and linear structural point data; (3) lithology and mineral assemblage data; (4) sample number, radiometric age, interpretation, dated material, and method for geochronology samples; (5) a comprehensive tectonostratigraphic legend for all Archean, Paleoproterozoic, and Neoproterozoic units and structures in the map area; (6) an up-to-date reference list for larger-scale source maps; and (7) key hydrographic features for the Cape Smith, Cap Wolstenholme, Cap de Nouvelle-France, and Joy Bay region, northern Ungava Peninsula, Quebec. The purpose of this Open File is to provide a complete, analogue and digital, internally consistent, and georeferenced collection of spatial data that will assist interested parties in mineral exploration, environmental studies, land use planning, and other investigations requiring up-to-date earth sciences information. The Open File map was compiled, modified and generalized from previously published Open File maps, A-series maps, and reports produced by the Geological Survey of Canada for the eastern, northern and extreme western portion of the Ungava Peninsula and adjacent islands, and SIGEOM maps published by the Ministère des ressources naturelles du Québec for the western portion of the peninsula. The map shows a variety of units of Archean to Neoproterozoic age, which can be grouped into the following bedrock tectonostratigraphic assemblages. In the southern portion of the map area, the lower-plate Archean Superior craton comprises dominantly felsic orthogneisses and plutonic units ranging in age between 3220+32/-23 - 2737±2 Ma. Unconformably overlying the felsic basement is a suite of parautochthonous basal clastic sedimentary units, carbonatitic volcaniclastic rocks, and continental tholeiitic flood basalt and rhyolite (Povungnituk Group) associated with initial Paleoproterozoic rifting of the northern Superior craton. These units have yielded ages between 2038+4/-2 - 1959+3.1/-2.7 Ma. Stratigraphically overlying the initial-rift sedimentary and volcanic rocks is a younger succession of predominantly komatiitic to tholeiitic basalts (Chukotat Group) accumulated during renewed rifting along the northern continental margin and dated between 1887+37/-11 - 1870±4 Ma. The ages of the younger volcanic succession indicate that ca. 150 Ma elapsed between the onset of initial continental rifting and the subsequent rifting event. A south-verging tectonic boundary or crustal suture (Bergeron suture) separates the northern Superior margin strata from allochthonous crustal elements of the Churchill plate to the north. Associated with and sitting in the hanging wall of the Bergeron suture are the crustal components of an obducted Paleoproterozoic ophiolite (Watts Group) dated as 1998±2 Ma. North of the Watts Group, a magmatic arc terrane forms the leading edge of the Churchill plate and includes: fore-arc clastic deposits (Spartan Group), a dominantly volcanic sequence (Parent Group), and a dominantly plutonic assemblage (Narsajuaq arc). The volcanic and plutonic units of the arc terrane can be grouped into two temporally and petrologically distinct, suites. The older suite includes calc-alkaline layered diorite-tonalite gneiss and tholeiitic to calc-alkaline basaltic andesite to rhyolite, and is dated between 1863±2 - 1845±2 Ma. It is interpreted as an island-arc assemblage built on Paleoproterozoic oceanic crust (Watts Group above) and a rifted sliver of Archean continental crust. The younger suite comprises crosscutting, gneissic to massive, monzodiorite to granite plutons. It is bracketed between 1842+5/-3 - 1820+4/-3 Ma and is interpreted as having been emplaced in an Andean-type continental arc setting. Archean and Paleoproterozoic units are intruded by massive, non-metamorphosed diabase dykes of Neoproterozoic age.