| Title | High-resolution mapping of glacial landscapes in central mainland Nunavut using ArcticDEM data and Landsat 8 imagery |
| |
| Author | McMartin, I ;
Godbout, P -M; Campbell, J E; Tremblay, T; Behnia, P |
| Source | GSA 2020 Connects Online - Geological Society of America Annual Meeting; Geological Society of America, Abstracts With Programs vol. 52, no. 6, 129-3, 2020 p. 1, https://doi.org/10.1130/abs/2020AM-354703  Open
Access |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200344 |
| Publisher | Geological Society of America |
| Meeting | GSA 2020: Geological Society of America Annual Meeting 2020; October 26-30, 2020 |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | html; pdf |
| 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; environmental geology; economic geology; Nature and Environment; Science and Technology; glacial history; glaciation; ice sheets; deglaciation; glacial features; glacial
landforms; ice flow; paleoenvironment; sediment transport; sediment dispersal; mineral exploration; drift prospecting; climate; Laurentide Ice Sheet; ArcticDEM; Landsat 8; Geological maps; ice-flow directions; ice streams; ice divides; Geographic
data; Geographic information systems; Climate change; Phanerozoic; Cenozoic; Quaternary |
| Program | GEM2: Geo-mapping for Energy and Minerals Rae Province, Synthesis of glacial history |
| Released | 2020 10 01 |
| Abstract | A new glacial geomorphology map was produced for an area covering ~415,000 km2 in a core region of the Laurentide Ice Sheet (LIS) in Nunavut. The map builds on recent and legacy surficial geology maps
and is significantly improved by digitization of glacigenic features using a combination of high-resolution ArcticDEM data (2-m resampled to 5-m resolution) and Landsat 8 images (30-m pansharpen to 15-m). Data comprised of glacial geomorphological
features were individually identified (lines and points) or grouped in generalized areas (polygons). Information (metadata) was stored in attribute tables for each mapped feature, including feature type, subtype (if distinguished), and original map
data source and/or nature of modification or addition.
From this unprecedented, detailed inventory of ~152,000 features and >14,000 field observations, 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 and 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.
The final products consist of: generalized glacial geomorphology maps at 1:5 million and 1:1 million scales; an interpretation of entirely new
or updated glacial landsystems; and a bibliography of all published sources of information. The GIS data files comprise glacial features mapped at original scales, standardized field datasets and glacial landsystems overlays. These new georeferenced,
multi-scale datasets provide a comprehensive framework to strengthen reconstructions of the glacial history and dynamics of one of the largest ice dome of the LIS, help 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 poster presents a new glacial geomorphology map 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 poster highlights the various data sources, the mapping methods using high-resolution imageries and the interpretations of glacial landsystems. The work was
undertaken to provide new geological knowledge on the glacial history of the Keewatin region and to help understand glacial transport across major glacial landscapes in northern regions. The findings will support informed decision making for resource
exploration and land use management. |
| GEOSCAN ID | 327032 |
|
|