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TitlePrecambrian bedrock geology of the Pond Inlet-Mary River area, northern Baffin Island, Nunavut
AuthorSkipton, D R; Saumur, B -MORCID logo; St-Onge, M R; Wodicka, NORCID logo; Bros, E R; Morin, A; Brouillette, P; Weller, O M; Johnston, S T
SourceCanada-Nunavut Geoscience Office Summary of Activities 2017; Canada-Nunavut Geoscience Office, Summary of Activities (2017), 2017 p. 49-68 Open Access logo Open Access
LinksOnline - En ligne (53.7 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20170235
PublisherCanada-Nunavut Geoscience Office
Mediapaper; on-line; digital
File formatpdf
NTS38B; 37G; 37F; 37E
AreaBaffin Island; Pond Inlet; Mary River area
Lat/Long WENS -80.0000 -72.0000 73.0000 70.0000
Subjectsregional geology; stratigraphy; economic geology; metallic minerals; bedrock geology; stratigraphic analyses; iron formations; mineral potential; mineral occurrences; monzo-granites; granodiorites; plutons; intrusions; granulites; greenschists; tectonic history; economics
Illustrationslocation maps; geophysical images; photographs
ProgramGEM2: Geo-mapping for Energy and Minerals Mary River North Baffin
AbstractThis paper presents the field observations and initial interpretations stemming from six weeks of regional bedrock mapping during the summer of 2017 in the Pond Inlet - Mary River area (NTS sheets 38B, 37G) of northern Baffin Island, Nunavut. This area, which is notable for the world-class Mary River Fe-deposit, was targeted under the Geo-mapping for Energy and Minerals (GEM) program to upgrade bedrock mapping coverage and geoscience knowledge for Baffin Island north of latitude 70°N. The bedrock geology in the study area is dominated by Archean tonalitic-monzogranitic gneisses including minor mafic-intermediate components, and by relatively homogeneous monzogranite-granodiorite intrusions. The Archean Mary River Group forms discontinuous volcano-sedimentary belts, consisting of mafic volcanic rocks interlayered with minor siliciclastic strata, banded iron formation, and felsic-intermediate and ultramafic volcanic units. The supracrustal group is intruded by monzogranite-granodiorite plutons. In the northern part of the study area, metasedimentary pelitic to semipelitic units were observed in thrust contact with basement gneiss, and layered mafic-ultramafic intrusive bodies were identified along the northern coast of Baffin Island. Pre-Mesoproterozoic rocks record a complex structural history involving at least two regional deformation events, and mineral assemblages indicate metamorphic conditions ranging from upper-greenschist- to granulite-facies. Mesoproterozoic clastic and carbonate platform sequences of the Bylot Supergroup unconformably overlie and/or are faulted against Archean units in the northwestern part of the map area. These strata were deposited within a graben that forms part of the larger Borden basin. Results from the 2017 field campaign have implications for plate-tectonic reconstructions of NE Arctic Canada and evaluating the economic potential of northern Baffin Island.
Summary(Plain Language Summary, not published)
This article presents the results from six weeks of geological mapping conducted in the Pond Inlet - Mary River area of northern Baffin Island during July-August 2017. 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 (approx. 1.27-1.24 billion years old) sedimentary rocks that mostly consist of sandstone, shale and limestone, known as the Bylot Supergroup. The new mapping presented here 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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