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TitleGeochronological constraints on deformation in theWager shear zone, northwestern Hudson Bay, Nunavut
AuthorTherriault, I; Steenkamp, H M; Larson, K P; Cottle, J MORCID logo
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2018, 2018 p. 1-13 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20180247
PublisherCanada-Nunavut Geoscience Office
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
NTS56F/01; 56F/02; 56F/07; 56F/08; 56F/09; 56F/10; 56F/15; 56F/16; 56G; 56H
AreaKivalliq; Hudson Bay; Wager Bay; Ukkusiksalik National Park
Lat/Long WENS -93.0000 -88.0000 65.8333 65.0000
Subjectsregional geology; structural geology; tectonics; geochronology; igneous and metamorphic petrology; geophysics; economic geology; bedrock geology; structural features; shear zones; faults; lithology; metamorphic rocks; metamorphic facies; granulite facies; gneisses; orthogneisses; metasedimentary rocks; gossans; mineral occurrences; gold; copper; bismuth; silver; mineral potential; igneous rocks; intrusive rocks; monzo-granites; monzodiorites; granites; tectonic history; deformation; foliation; lineations; intrusions; crystallization; recrystallization; strain analysis; kinematic analysis; trend surface analyses; radiometric dating; uranium lead dating; geophysical interpretations; magnetic interpretations; total field magnetics; petrographic analyses; Archean; Wager Shear Zone; Paleoproterozoic; Hudson Suite; Chesterfield Shear Zone; Quoich River Fault Zone; Wager Pluton; Snow Island Suite; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs; Concordia diagrams; bar graphs; plots
ProgramCanada-Nunavut Geoscience Office, Funding Program
ProgramPolar Continental Shelf Program
Released2018 01 01
AbstractThe Wager shear zone (WSZ) is a major east- or west-trending zone of high strain located on the northwestern coast of Hudson Bay. New geological mapping was conducted along the structure during the summer of 2017 as part of a project that aims to better constrain the timing, duration and kinematics of the deformational events recorded by the WSZ and to interpret these events in a regional geological context. A suite of granitoid samples was collected from rocks variably affected by the WSZ for U-Pb zircon geochronology to place constraints on the timing of deformation. This paper presents the preliminary results for five of these samples, which range in age between 1895 and 1826 Ma, and indicate that the WSZ was actively deforming, at least locally, at ca. 1835-1826 Ma, coeval with peak Hudsonian-age plutonism in the region.
Summary(Plain Language Summary, not published)
Bedrock mapping was conducted in the summer of 2017 near Wager Bay, on the northwestern coast of Hudson Bay, Nunavut. Fieldwork focused on the Wager shear zone, which extends ~450 km from Southampton Island, through Wager Bay and farther inland westward. Shear zones are structures that form along the margins of large blocks of Earth¿s crust where the blocks have moved in different relative directions. The resulting characteristics of deformed rocks in a shear zone depend on what the crust is made of, and the temperature and pressure conditions that were reached during the movement event. Part of the work included the collection of granitic samples, which were analyzed over the past year to determine how old they are. Preliminary results indicate that these rocks are related to other granitic intrusions in the region and that the Wager shear zone was actively deforming around 1830 million years ago.

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