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TitleGeology of the Clyde-Cockburn land map area, north-central Baffin Island, District of Franklin
AuthorJackson, G D
SourceGeological Survey of Canada, Memoir no. 440, 2000, 316 pages (6 sheets),
PublisherNatural Resources Canada
MapsPublication contains 2 maps
Map Info.geophysical, aeromagnetic anomalies, 1:1,000,000
Map Info.geological, structural, lithological, 1:4,000,000
Mediapaper; on-line; digital
RelatedThis publication is related to Jackson, G D; (2006). Field data, NTS 37 G/5 and G/6, northern Baffin Island, Nunavut, Canada, Geological Survey of Canada, Open File 5317
File formatpdf
NTS27F; 27G; 37E; 37F; 37G; 37H
AreaBaffin Island; Barnes Ice Cap; Steensby Inlet; Angajurjualuk Lake; Buchan Gulf; Clyde Inlet; Bieler Lake; Cockburn Land
Lat/Long WENS-80.0000 -68.0000 72.0000 70.0000
Subjectsstructural geology; stratigraphy; igneous and metamorphic petrology; tectonics; Aphebian; Archean; bedrock geology; lithology; field relations; structural interpretations; structural features; igneous rocks; volcanic rocks; plutonic rocks; granodiorites; metamorphic rocks; metavolcanic rocks; metasedimentary rocks; dykes; sills; stratigraphic analyses; gneisses; Hadrynian; isopachs; geochemical analyses; radiometric dates; uranium lead dates; zircon dates; potassium argon dates; pressure-temperature conditions; mineral assemblages; facies; metamorphic facies; sedimentary rocks; mineral deposits; magnetite; hematite; amphibolites; schists; faults; folds; shear zones; major element geochemistry; trace element geochemistry; iron formations; spectrographic analyses; tectonic interpretations; granites; subgreenschist facies; greenschist facies; amphibolite facies; granulite facies; iron; gold; lead; zinc; copper; molybdenum; ultramafic rocks; carving stone, commodity; oil; gas; stratigraphic correlations; paleocurrents; fossils; geophysical surveys; magnetic surveys, airborne; magnetic anomalies; Piling Group; Mary River Group; Dewar Lakes Formation; Flint Lake Formation; Astarte River Formation; Longstaff Bluff FormationBylot Supergroup; Eqalulik Group; Adams Sound Formation; Arctic Bay Formation; Uluksan Group; Society Cliffs Formation; Admiralty Group; Gallery Formation; Turner Cliffs Formation; Ship Point Formation; Brodeur Group; Baillarge Formation; Committee Orogen; Isortoq fault zone; Baffin Orogen; Northeast Baffin Thrust Belt; Milne Inlet Trough; Precambrian; Proterozoic; Cretaceous; Quaternary; Paleozoic
Illustrationssketch maps; Concordia diagrams; photographs; aerial photographs; geochemical analyses; stratigraphic columns; histograms
Released2000 03 01; 2014 02 07
AbstractRemnants of a dissected peneplain, tilted up to the northeast, cap low, hummocky to mountainous ice-capped terrane. At least 90% of the map area is an Archean-Aphebian crystalline complex in which at least three episodes of granitic intrusion, each probably accompanied by anatexis, are represented. The oldest recognized major unit is nebulitic granitic migmatite (ca. 3.7-2.85 Ga). The migmatite, foliated granitic intrusions (ca. 2.85 Ga), and deformed amphibolite dykes are overlain unconformably by the Archean Mary River Group (2.74-2.72 Ga), a bimodal greenstone sequence containing komatiite and mafic and ultramafic intrusions. Slightly younger (2.71 Ga) massive monzogranite and late Aphebian granite and charnockite, and the older foliated granitic intrusions represent melts formed from older crust. Most of the granitic intrusions, including the 1.9-1.8 Ga Cumberland Batholith to the south, and the Mary River Group and associated igneous rocks, were emplaced in volcanic arc environments of active continental margins. The charnockites may include both metamorphosed Archean plutons and late synorogenic dry-melt, late Aphebian plutons. The late Aphebian Piling Group (1.9 Ga) contains a thin lower quartzite-dolostone shelf sequence, and a thick upper greywacke-shale turbidite sequence (with a basal mafic-ultramafic unit) deposited in a foredeep or back arc basin. The Neohelikian Bylot Supergroup (1.27-1.23 Ga) is chiefly fluvial quartz arenite, basinal shale, and shelf dolostone deposited in coarsening- and shallowing-up cycles. Northwest- trending Franklin (723 Ma) diabase dykes have slight chemical differences which may have resulted in selective magnetic overprinting of specific (Borden) dykes. Thin Cambro-Ordovician shelf carbonate and quartz arenite blanket the western margin of the area. Metamorphic grade ranges from subgreenschist to granulite (about 0.8 GPa, 775°C
Seven of the eight major structural domains recognized in the Committee and Baffin orogens on Baffin Island are represented in the map area. Both orogens extend into Melville Peninsula and western and northwestern Greenland; the Baffin Orogen also extends into northern Quebec-Labrador. Related major shear zones probably include some sutures. The Milne Inlet Trough (domain 8) is the southeast extension of the Neohelikian Borden Rift Basin, which developed as an aulacogen along the western boundary of domain 7 during the opening of the Poseidon Ocean to the northwest. Large high grade iron deposits occur at Mary River, and smaller ones are present chiefly in the western part of the map area. Lead-zinc mineralization occurs in the Bylot Supergroup along the north edge of the map area and in the Piling Group just south of the map area. Traces of lead-zinc-copper, molybdenum, nickel, silver, and gold occur locally.