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TitleSurficial geology studies across the Keewatin Ice Divide, Tehery-Wager Geoscience Project area, Nunavut
AuthorMcMartin, I; Day, S J A; Randour, I; Roy, M; Steenkamp, H M; Wodicka, N
Source2016 Yellowknife Geoscience Forum, abstract and summary volume; by Irwin, D; Gervais, S D; Terlaky, V; Northwest Territories Geological Survey, Yellowknife Geoscience Forum Abstracts Volume 2016, 2016 p. 93-94
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20160214
PublisherNorthwest Territories Geological Survey
Meeting44th Annual Yellowknife Geoscience Forum; Yellowknife, NT; CA; November 15-17, 2016
Documentserial
Lang.English
File formatpdf
ProvinceNunavut
NTS46D/05; 46D/12; 46D/13; 46D/14; 56A; 56B; 56C/01; 56C/02; 56C/07; 56C/08; 56C/09; 56C/10; 56C/15; 56C/16; 56F/01; 56F/02; 56F/07; 56F/08; 56F/09; 56F/10; 56F/15; 56F/16; 56G/01; 56G/02; 56G/03; 56G/04; 56G/05; 56G/06; 56G/07; 56G/08; 56G/09; 56G/10; 56G/11; 56G/12; 56H/01; 56H/02; 56H/03; 56H/04; 56H/05; 56H/06; 56H/07; 56H/08; 46E/03; 46E/04
AreaWager Bay; Tehery Lake; Brown Lake; Masivak Creek; Roes Welcome Sound; Lorillard River
Lat/Long WENS -93.0000 -87.0000 65.8333 64.0000
Subjectssurficial geology/geomorphology; geochemistry; geological surveys; glacial deposits; tills; ice-wedge polygons; felsenmeer; stream sediment samples; till samples; dispersal patterns; glacial landforms; eskers; ice flow; ice movement directions; ice transport directions; geological history; glacial history; glaciation; ice sheets; weathering; ice retreat; submergence; provenance; mineral potential; mineral exploration; bedrock geology; gossans; glacial striations; striae; frost boil geochemistry; meltwater channels; trend surface analyses; paleo-sea levels; sediment reworking; marine environments; beach deposits; terraces; glaciomarine deposits; deltaic deposits; marine sediments; geochemical anomalies; Keewatin Ice Divide (KID); ice divides; water samples; embayments; Paleoproterozoic; Phanerozoic; Cenozoic; Quaternary; Precambrian; Proterozoic
ProgramRae Province, Tehery-Wager Bay, GEM2: Geo-mapping for Energy and Minerals
AbstractTargeted surficial geology studies as well as glacial and stream sediment sampling continued during the summer of 2016 in the central and western parts of the Tehery-Wager GEM-2 Rae Project area, mainland Nunavut. This work provided an opportunity to gather data on the nature, distribution, and patterns of surficial sediments and landforms, chronology of potential relict weathered terrain, and changes in ice flow trends during the last glaciation and ice retreat phases. Till, stream sediment and water samples were collected for provenance and evaluation of mineral potential.
The uplands south of Wager Bay and Brown Lake, which coincide with the Keewatin Ice Divide (KID) zone, are dominated by a mixture of till blankets and veneers, bouldery till with orthogonal, giant ice-wedge polygons, weathered bedrock, and felsenmeer. The ice divide zone itself is relatively narrow and characterized by either the absence of ice-flow indicators or the presence of opposing ice-flow directions. South of the divide, the predominant regional trend of streamlined till features indicates ice flow to the SE and ESE, parallel to main striation directions. Late SSE striae, parallel to a later, more SSE esker trend, locally cross-cut the predominant streamlined terrain. Along the southwestern shores of Wager Bay, early northward and late ice flows into the bay are observed in the landform and striation record as far east as Masivak Creek and suggest that the KID lay in a narrow zone inland southwest of the bay and then continued into Wager Bay. A complex system of sub-glacial meltwater corridors and proglacial meltwater channels are interspersed between the streamlined, thin and thick till that extend outward from the KID. North of the KID, very few eskers are present and meltwater corridors are absent. The post-glacial limit of marine inundation increases from ~118 m asl south of Wager Bay to 140 m west of Roes Welcome Sound and stays relatively constant at 140-150 m towards Tehery Lake. At the marine limit, erosion and reworking of glacial sediments have formed bouldery beaches, wave-washed surfaces, terraces, glaciomarine deltas, and wave-cut notches in till. Below the marine limit, silty sandy marine veneers and blankets are scattered in low areas; bouldery beaches skirt some esker ridges or fill in embayments between bedrock outcrops along the coastal areas.
Till samples were collected at 40 sites to provide more detail on geochemical anomalies identified in 2015 and along two 200 km-long transects roughly parallel to ice-flow and across the KID to characterize the regional glacial transport. Vertical profile samples in frost boils were collected at two selected sites above and below the marine limit to evaluate the effects of marine reworking on till texture and geochemical composition. Stream sediment and water samples were collected at 67 sites, predominantly from the headwaters of the Lorillard River, as well as along a transect across a Paleoproterozoic supracrustal package with several gossanous horizons in the western part of the study area. Preliminary results from the till and stream surveys will be presented as they have implications for mineral exploration.
Summary(Plain Language Summary, not published)
This poster presents an overview of the 2016 field work completed south of Wager Bay, mainland Nunavut, as part of the surficial geology component of the GEM-2 Tehery-Wager Activity within the Rae Project. The poster highlights preliminary results regarding the regional surficial geology and Quaternary history, and the applications of glacial and stream sediment sampling for mineral exploration. The work was undertaken to provide new geological knowledge on the nature and composition of surficial materials deposited during the retreat of the Laurentide Ice Sheet, successive marine inundation and emergence, and addresses a number of scientific questions relevant to the mineral exploration industry. The findings will support informed decision making for resource exploration and development, and for land use management.
GEOSCAN ID299317