| Title | A new map of glacigenic features and glacial landsystems in central mainland Nunavut, Canada |
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| Author | McMartin, I ;
Godbout, P -M; Campbell, J E; Tremblay, T; Behnia, P |
| Source | Boreas 2020 p. 1-25, https://doi.org/10.1111/bor.12479  Open Access |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200289 |
| Publisher | Taylor & Francis Online |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| Related | This publication is related to the following
publications |
| File format | pdf; html |
| Province | Nunavut |
| NTS | 46D; 46E; 46F; 46K; 46L; 46M; 46N; 55; 56; 65A; 65B; 65G; 65H; 65I; 65J; 65O; 65P; 66A; 66B; 66G; 66H; 66I; 66J; 66O; 66P |
| Area | Hudson Bay; Wager Bay; Baker Lake; Rankin Inlet; Arviat; Naujaat |
| Lat/Long WENS | -100.0000 -85.0000 68.0000 60.0000 |
| Subjects | surficial geology/geomorphology; geophysics; economic geology; environmental geology; Nature and Environment; Science and Technology; glacial history; glaciation; ice sheets; ice flow; deglaciation; ice
retreat; glacial landforms; glacial features; eskers; moraines; crag and tail; lineations; troughs; meltwater channels; deltas; tills; remote sensing; satellite imagery; relative ages; paleoenvironment; sediment transport; sediment dispersal; mineral
exploration; drift prospecting; modelling; climate; glaciers; Laurentide Ice Sheet; Keewatin Sector; ArcticDEM; Landsat 8; Keewatin Ice Divide; Dubawnt Supergroup; ice streams; ice-flow directions; ice divides; Geographic data; Climate change;
Databases; subglacial meltwater corridors; limit of submergence, marine; ice-contact deltas; Geological maps; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | location maps; digital elevation models; geoscientific sketch maps; photographs; satellite images |
| Program | GEM2: Geo-mapping for Energy and Minerals Rae Province, Synthesis of glacial history |
| Released | 2020 11 06 |
| Abstract | A new digital map of glacial geomorphic features and interpreted glacial landsystems was produced for an area covering ~415 000 km2 in the Keewatin Sector of the Laurentide Ice Sheet (LIS) in Nunavut.
The map integrates information from previous surficial geology maps and >14 000 field stations, and is significantly improved by the detailed inventory of ~152 000 glacigenic features using high-resolution ArcticDEM data and Landsat 8 imagery. From
this, we identify and map coherent patterns of landform development (landsystems) between the Manitoba border and the Arctic coast, many of which are entirely new and others that are significantly modified or updated. In particular, we recognize six
separate ice streams, including one probable remnant ice stream, and we delineate numerous palimpsest streamlined landscapes with associated ice-flow trends and relative ages. A continuum of relict terrains with varying basal ice thermal conditions
is mapped for the first time in the ice divide migration zone between Baker Lake and Wager Bay. In addition, deglacial cold-based retreat terrains and preserved warm-based landscapes unaffected by younger glacial events have been identified. These
new georeferenced, multi-scale data sets and interpreted glacial landsystems provide a comprehensive framework to strengthen reconstructions of the glacial history and dynamics of one of the largest ice domes of the LIS, identify distinct glacial
sediment transport paths for applications to mineral exploration, and test numerical modelling of the LIS in support of climate change studies and long-term evolution of modern ice sheets. |
| Summary | (Plain Language Summary, not published)
This paper presents a glacial geomorphology map compilation synthesizing a comprehensive database of former glacial landscapes in a large area of
mainland Nunavut as part of the GEM-2 Rae Synthesis of Glacial History and Dynamics Activity. The paper highlights the nomenclature and methods developed to build the map compilation, the various data sources and interpretations regarding the glacial
landsystems identified. The work was undertaken to provide new geological knowledge on the history of ice flow events and help understand glacial transport characteristics across major glacial landscapes in northern regions. The findings will support
informed decision making for resource exploration and land use management. |
| GEOSCAN ID | 326891 |
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