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TitleNew mapping and initial structural characterization of the Wager shear zone, northwestern Hudson Bay, Nunavut
AuthorTherriault, I; Steenkamp, H M; Larson, K P
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2017, 2017 p. 1-12 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20170261
PublisherCanada-Nunavut Geoscience Office
Mediapaper; on-line; digital
File formatpdf
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
ProgramCanada-Nunavut Geoscience Office, Funding Program
ProgramPolar Continental Shelf Program
Released2017 01 01
AbstractNew geological mapping was conducted during the summer of 2017 along the inferred Paleoproterozoic Wager shear zone (WSZ), located on the northwestern coast of Hudson Bay, Nunavut. This work is the basis for a project that aims to better constrain the timing, duration and kinematics of the deformational events preserved by the WSZ, and to interpret these events in a regional context. Fieldwork consisted of daily traverses across the shear zone, during which lithological and structural data were recorded, and samples were collected for petrographic, microstructural and geochronological analyses. At the outcrop scale, the shear zone is characterized by a steep, east- or west-trending mylonitic foliation and a subhorizontal mineral-stretching lineation with abundant dextral shear-sense indicators. Abroad strain gradient across the southern boundary of the WSZ is up to 2-3 km wide, whereas the northern boundary appears to be more abrupt, generally less than 250 m wide. Rocks outside the shear zone preserve evidence of earlier, largely sinistral, deformation. Detailed analytical work is now underway to help unravel the complex structural history of the area and investigate the potential relationship between the WSZ and Paleoproterozoic (and possibly older) regional tectonic events.
Summary(Plain Language Summary, not published)
Bedrock mapping was done in June and July 2017 near Wager Bay, on the northwestern coast of Hudson Bay, Nunavut. This work was led by the CNGO, but is part of the CNGO-GSC partnered Tehery-Wager Geoscience Project of the Geo-mapping for Energy and Minerals program Rae activity. Fieldwork focused on the Wager shear zone, a ~450 km fault zone that runs through Wager Bay. The goals of this work were to find the boundaries of the shear zone and evaluate the strain gradient from the undeformed margins toward the core of the shear zone. Rock samples were taken to confirm their mineral components, look for microscopic evidence of deformation and determine how old the rocks are. The field and analytical data will help answer important questions about the timing, duration and direction of movements recorded by the Wager shear zone. The results will be integrated with structural and age data for neighbouring rocks to better understand the geological history of the northwestern Hudson Bay region.

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