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TitleArchean unconformity in the Qalluviartuuq greenstone belt, Goudalie domain, northern Quebec
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorWinsky, P A; Kusky, T M; Percival, J A; Skulski, TORCID logo
SourceCanadian Shield/Bouclier canadien; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1995-C, 1995 p. 131-140, Open Access logo Open Access
PublisherNatural Resources Canada
Lang.English; French
Mediapaper; on-line; digital
RelatedThis publication is contained in Canadian Shield
File formatpdf
AreaQalluviartuuq Lake
Lat/Long WENS-75.0817 -75.0000 59.8333 59.7889
Subjectsstructural geology; igneous and metamorphic petrology; unconformities; Archean; structural features; lithology; conglomerates; sedimentary rocks; plutonic rocks; volcanic rocks; basalts; gabbros; igneous rocks; tectonic interpretations; tectonic elements; deformation; metamorphism; Qalluviartuuq Greenstone Belt; Goudalie Domain; Superior Province; Minto Block; Precambrian
Illustrationssketch maps; photographs
Released1995 01 01
AbstractAn unconformity in the northern Qalluviartuuq greenstone belt separates basement of metasedimentary and tonalitic rocks from conglomerate and sandstone. The basal conglomerate has tonalitic clasts, grading upward into a polymict assemblage of tonalite, basalt, andesite, granodiorite, metasedimentary and ultramafic clasts. The basalt, gabbro, and ultramafic clasts suggest that a metavolcanic terrane was being eroded in the (local) source area for the conglomerate, and yet the conglomerate passes with apparent stratigraphic continuity upwards into mafic volcanics. Either an older greenstone sequence within the basement complex contributed detritus to the conglomerate, or a tectonic break may be hidden in the complex structure of a fragmental mafic unit marking the contact between the conglomerate and metavolcanic units. In this second hypothesis, an overriding greenstone sheet would have shed clasts as it was thrust over synorogenic conglomerate deposited on basement.

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