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TitreAn assessment of surficial geology, massive ice, and ground ice, Tuktoyaktuk Peninsula, Northwest Territories: application to the proposed Inuvik to Tuktoyaktuk all-weather highway
AuteurSmith, I R; Duong, L
SourceCommission géologique du Canada, Dossier public 7106, 2012, 42 pages, (Accès ouvert)
LiensMetadata - Métadonnées
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est reliée Rampton, V N; (1987). Surficial Geology, Tuktoyaktuk Coastlands, District of Mackenzie, Northwest Territories, Commission géologique du Canada, Carte série "A" no. 1647A
Formatspdf; rtf; mxd; shp; xml; html; txt
SNRC107B/07; 107B/10; 107B/15; 107B/16; 107C/01; 107C/02; 107C/07; 107C/08
Lat/Long OENS-134.0000 -132.5000 69.5000 68.2500
Sujetsdépôts glaciaires; elements glaciaires; topographie glaciaire; glace massive; glace fossile; antecedents glaciaires; tills; pergélisol; lithostratigraphie; pingos; elements d'appropriation à la construction; lithologie; glissements; structures de glissement; géologie des dépôts meubles/géomorphologie; Nature et environnement
Illustrationslocation maps; plots
ProgrammeGéosciences de changements climatiques, Renforcement de la résilience des communautés canadiennes face aux changements climatiques
Diffusé2012 11 01
Résumé(disponible en anglais seulement)
This report utilizes seismic shothole drillers' lithostratigraphic logs as a basis for contrasting previously published maps and reports of surficial geology, massive ice and ground ice, on the Tuktoyaktuk Peninsula, Northwest Territories. Areas of glaciofluvial ice-contact and outwash deposits, and lacustrine sediments in thermokarst terrain are demonstrated to be less extensive, while areas of till cover are more widespread. Approximately 2% of all shotholes contain records of massive ice, it is most abundant between 4 and 14 m depth, and principally is situated at lithostratigraphic contacts (73%). On the Tuktoyaktuk Peninsula, half (52%) of the massive ice records occur in areas of surface till cover, and it is largely underlain by "sorted + sorted, fine" deposits (72%). Significant spatial, lithostratigraphic, and thickness differences are noted in other physiographic regions. Shothole ground ice records are more common (13% of all such records), particularly within the 15 km buffer area surrounding the proposed Inuvik to Tuktoyaktuk Highway (18.4%), although it is acknowledged that many such records may relate to massive ice deposits, and that drillers typically under-report ground ice occurrence. There is significant disagreement between shothole-based massive ice and ground ice occurrences with existing permafrost and ground ice maps that were constructed on the basis of surficial geology-related ground ice associations. Changes in surficial geology classification account for part, elsewhere, ground ice is simply found to be more abundant in different deposit types than previously surmised.
It is argued that integration of abundant shothole lithostratigraphic data provides a more reliable reconstruction of surficial geology, massive ice, and ground ice conditions in the Tuktoyaktuk Peninsula. The data and syntheses presented can better inform engineering and landscape stability assessments, and similarly identify areas wherein more detailed field-surveys and inspection are likely required as part of an infrastructure development proposal.