| Titre | Reconnaissance surficial geology of the Rivière Grandin map area (NTS 86-D) and the legacy of glacial Lake McConnell, Northwest Territories: GEM-2 Mackenzie Project, report of activities 2018 |
| Télécharger | Téléchargements |
| Auteur | O'Neill, H B; Kerr, D E; Wolfe, S A |
| Source | Commission géologique du Canada, Dossier public 8479, 2018, 14 pages, https://doi.org/10.4095/313011 (Accès ouvert) |
| Image |  |
| Année | 2018 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/313011 |
| Media | en ligne; numérique |
| Formats | pdf |
| Province | Territoires du Nord-Ouest |
| SNRC | 75C; 75D; 75E; 75F; 75K; 75L; 75M; 75N; 85; 86C; 86D; 86E; 86F; 86K; 86L; 86M; 96A; 96B; 96F; 96G; 96H; 96I; 96J; 96K |
| Lat/Long OENS | -126.0000 -109.0000 68.0000 60.0000 |
| Sujets | dépôts glaciaires; elements glaciaires; topographie glaciaire; lacs glaciaires; chenaux d'eau de fonte; drumlins; rainures glaciaires; moraines; tills; crag-and-tail; drumlinoïdes; stries glaciaires;
antecedents glaciaires; écoulement glaciaire; déglaciation; dépôts éoliens; sables; dépôts organiques; tourbières; colluvions; alluvions; niveaux d'eau; sable, derive; silice, dérivé; datation radiométrique; datation au radiocarbone; Lac glaciaire de
McConnell; Calotte glaciaire Laurentide; sédiments glaciolacustres; sédiments glaciolacustres bassinaux; sédiments glaciolacustres deltaïques; sédiments glaciolacustres de plages; sédiments fluvioglaciaires bosselés; crêtes morainiques; tills
fuselés; moraines côtelées; directions d'écoulement glaciaire; sédiments glaciolacustres littoraux; sédiments lacustres; géologie des dépôts meubles/géomorphologie; géologie économique; géochronologie; Phanérozoïque; Cénozoïque; Quaternaire |
| Illustrations | location maps; geoscientific sketch maps; time series |
| Programme | GEM2 : La géocartographie de l'énergie et des minéraux, Cartographie des dépôts meubles de North Bear du corridor de Mackenzie |
| Diffusé | 2018 11 01 |
| Résumé | (disponible en anglais seulement)
This report provides information on progress for three North Bear activities: (1) reconnaissance surficial geology mapping of the Rivière Grandin area, (2)
ongoing compilation of mapped glaciolacustrine features associated with glacial Lake McConnell, and (3) surficial geology mapping and Holocene landscape investigations at Whitebeach Point, Northwest Territories. These activities contribute new
geological knowledge and improve our understanding of the distribution and nature of the surficial geology cover and the glacial history of this region.
The Rivière Grandin map area (NTS 86-D; 1:125,000 scale) is characterized by three glacial
terrains defined by different surficial sediments. Along and inland from the shores of Hottah Lake in the northeast, glacial Lake McConnell deltas, beaches and offshore sediments occur between 180-350 m elevation. Farther west, terrain near or above
500-600 m elevation is defined by hummocky glaciofluvial sediments, a few moraine ridges, abundant radial meltwater channels, and an absence of ice-flow indicators, which may indicate local cold-based glacial ice regimes. On the eastern edge of the
Ortona Lake highlands, rare drumlins trend northwestward, perpendicular to the flutings at lower elevations to the north and south. The remaining and most extensive map areas are generally covered by streamlined till with interspersed minor moraines
composed of ridged till. Drumlins, crag-and-tails and drumlinoids record northwestward and southwestward divergent and convergent ice flows. The area north, west, and south of Rome Lake has a greater concentration of ridged till. Late during
deglaciation, a minor ice-flow shift occurred in the southwest map area, indicated by small, superimposed streamlined landforms.
Compilation of glaciolacustrine features attributed to glacial Lake McConnell is ongoing. These features are from
surficial maps that conform to the Surficial Data Model of the Geological Survey of Canada. To date, two NTS map sheets have been added in 2018 (86-D, L) and 17 NTS map sheets were added in 2017. Continuing compilation will improve knowledge of
previous glacial lake limits and the associated surficial geology.
The Whitebeach Point area was previously inundated by glacial Lake McConnell and more recently by ancestral Great Slave Lake. Surficial geology mapping of the area has identified
a complex array of deposits, including widespread eolian sand dunes and sheets, beach ridges, and peatlands. The ongoing work will also examine the Holocene lake level history and landscape development of the area, which includes high-grade silica
sand deposits. |
| Résumé | (Résumé en langage clair et simple, non publié)
La carte de la rivière Grandin (SNRC 86-D) identifie les matières de surface et les reliefs associés résultant du retrait des derniers glaciers.
La géologie de surface est basée sur l'interprétation de photographies aériennes, avec des bandes limitées d'une publication antérieure. Ces travaux fournissent de nouvelles connaissances géologiques et améliorent notre compréhension de la
distribution, de la nature et de l'histoire glaciaire des matières de surface. Il contribue à l'évaluation des ressources et à la gestion efficace de l'utilisation des terres. |
| GEOSCAN ID | 313011 |
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