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TitlePrecambrian geology of the surroundings of Steensby Inlet and western Barnes Ice Cap (parts of NTS 37E, 37F, 37G), Baffin Island, Nunavut
AuthorSaumur, B MORCID logo; Skipton, D R; St-Onge, M R; Bros, E R; Acosta-Góngora, P; Kelly, C J; Morin, A; O'Brien, M E; Johnston, S T; Weller, O M
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2018, 2018 p. 29-45 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20180281
PublisherCanada Nunavut-Geoscience Office
Mediapaper; on-line; digital
File formatpdf
NTS37E/03; 37E/04; 37E/05; 37E/06; 37E/11; 37E/12; 37E/13; 37E/14; 37F; 37G/01; 37G/02; 37G/03; 37G/04; 37G/05; 37G/06; 37G/07; 37G/08
AreaSteensby Inlet; Barnes Ice Cap; Baffin Island
Lat/Long WENS -80.0000 -74.0000 71.5000 70.0000
Subjectsregional geology; tectonics; stratigraphy; economic geology; geophysics; Archean; tectonostratigraphic zones; bedrock geology; lithology; igneous rocks; clinopyroxenites; intrusive rocks; felsic intrusive rocks; diorites; monzo-granites; monzonites; granodiorites; gabbros; volcanic rocks; metamorphic rocks; tectonites; gneisses; granulite facies; marbles; metasedimentary rocks; psammites; pelites; sedimentary rocks; limestones; dolostones; sandstones; iron formations; ironstone; structural features; faults; fault zones; textural analyses; gneissosity; foliation; fabric analyses; mineral deposits; iron ores; carving stone, commodity; mineral potential; tectonic evolution; tectonic history; deformation; metamorphism; crustal structure; correlations; felsenmeer; geophysical interpretations; magnetic interpretations; Paleoproterozoic; Rae Craton; Mary River Group; Piling Group; Franklin Dykes; Isotorq Fault Zone; North Cockburn River prospect; Glacier Lake synform prospect; Isortoq Fault; Mary River Deposits; Rowley River prospect; Triangle Lake prospect; Turner River prospect; Magnetite Hill showing; Precambrian; Proterozoic; Paleozoic
Illustrationsgeoscientific sketch maps; photographs
ProgramGEM2: Geo-mapping for Energy and Minerals Mary River North Baffin
Released2018 12 28
AbstractThe Geological Survey of Canada conducted two seasons of 1:100 000 scale bedrock mapping on northern Baffin Island, as part of the Geo-Mapping for Energy and Minerals (GEM-2) Program. The new mapping will contribute to modernizing the geoscience knowledge base of this part of Nunavut, as well as further characterizing poorly understood Archean and Paleoproterozoic units. Mapping in the Pond Inlet area was completed in 2017, resulting in three new bedrock geology maps. Summarized herein are the principal tectonostratigraphic units encountered during the second field season, which involved four weeks of mapping in July and August 2018, in the Steensby Inlet and Barnes Ice Cap areas (NTS area 37F, western half of 37E and southern half of 37G).
The geology of the Steensby Inlet and Barnes Ice Cap areas is dominated by a variety of Archean to Paleoproterozoic units of plutonic origin, ranging from dioritic to monzogranitic in composition, that vary from exhibiting a strong gneissosity, to forming S>L- to L-tectonite, to remaining massive to weakly foliated. The 2018 field area locally includes orthopyroxene-bearing monzogranitic gneiss, indicative of granulite-facies conditions. The area also contains numerous iron ore deposits hosted by the polydeformed and metamorphosed Archean Mary River Group, including Deposit No. 1 which is currently in production, as well as pelitic to psammitic gneiss, marble and calcsilicate interpreted as belonging to the Paleoproterozoic Piling Group.
Data from the 2018 field mapping campaign, integrated with results from the 2017 season, will refine the understanding of the metamorphic, structural and tectonic evolution of northern Baffin Island, as well as constrain correlations with other terranes on mainland Nunavut and Greenland that are prospective for several mineral commodities.
Summary(Plain Language Summary, not published)
This article presents the results from four weeks of geological mapping conducted in the Steensby Inlet - Barnes Ice Cap area of northern Baffin Island during July-August 2018. With the goal of improving the level of geoscience knowledge for northern Baffin Island, this mapping forms part of the Geo-Mapping for Energy and Minerals (GEM-2) North Baffin Bedrock Mapping Project led by the Geological Survey of Canada. The study area is mainly comprised of 2.9-2.7 billion years old granite-type rocks and 2.7 billion years old volcanic and sedimentary rocks of the Mary River Group. This group of rocks hosts iron ore deposits, including the high-grade Mary River deposit. The study area also contains younger, Paleoproterozoic rocks of the Piling Group, which consists of marble and metamorphosed sedimentary rocks. This new mapping, combined with mapping performed in 2017, provides an improved understanding of the geology of northern Baffin Island, with implications for economic mineral potential and the ancient assembly of tectonic plates in the eastern Canadian Arctic.

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