|Titre||Far North Geomapping Initiative: Quaternary geology of the Great Island - Kellas Lake area, northern Manitoba (parts of NTS 54L, M, 64I, P)|
|Auteur||Trommelen, M T; Ross, M; Campbell, J E|
|Source||Manitoba Department of Energy and Mines, Geological Services, Report of Activities 2010, 2010 p. 36-49|
|Séries alt.||Secteur des sciences de la Terre, Contribution externe 20100227|
|Document||publication en série|
|SNRC||54L/13; 54L/14; 54M/03; 54M/04; 54M/05; 54M/06; 54M/11; 54M/12; 64I/15; 64I/16; 64P/01; 64P/02; 64P/07; 64P/08; 64P/09; 64P/10|
|Lat/Long OENS||-97.0000 -95.0000 59.5833 58.8333|
|Sujets||dépôts glaciaires; topographie glaciaire; elements glaciaires; écoulement glaciaire; directions des mouvements de la glace; tills; dépôts de till; antecedents glaciaires; dépôts fluvioglaciaires; Moraine
de Rogain ; Till de Keewatin ; Till d'Hudsonian ; Till de Labradorean ; géologie des dépôts meubles/géomorphologie; Quaternaire; Cénozoïque|
|Illustrations||location maps; tables; photographs|
|Programme||Gisements polymétalliques - nord-est du Manitoba, GEM : La géocartographie de l'énergie et des minéraux|
|Résumé||(disponible en anglais seulement)|
This is the second of a multi-year collaboration between the Manitoba Geological Survey, the Geological Survey of Canada and the University of Waterloo to
investigate the surficial geology in northern Manitoba, as part of the Manitoba Far North Geomapping Initiative. This surficial geology study aims to elucidate the glacial geology and geomorphology of Manitoba's far north (north of 58°) - an
objective that, in conjunction with detailed bedrock mapping, will provide a modern geoscience knowledge base tailored towards current and future mineral exploration and development. This report presents a summary of fieldwork activities related to a
month-long detailed survey in summer 2010. Geological observations, sampling of glacial sediments (till) and/or measurements of ice-flow indicators were recorded at 237 stations within an 8100 km2 area in northeastern Manitoba, which extends from
south of the Seal River in the Great Island area to Kellas Lake in the north. A series of 1:50 000 scale surficial geology maps is in progress for the Great Island - Kellas Lake area, which encompasses 5700 km2. The preliminary findings of this
mapping are presented herein.
The Quaternary geology survey focused on collection of ice-flow indicator data and till samples for dispersal train analysis. Samples were collected from till plains, till blankets, till veneers and from streamlined
terrain and Rogen moraine terrain, in an effort to establish sediment - landform relationships in northeastern Manitoba. Once analysis and interpretations are completed, these relationships will be applied to update drift-prospecting methodologies
for northern Manitoba. Additionally, Rogen moraine and streamlined terrain areas were mapped and sampled throughout the study area. To investigate the internal architecture of Rogen moraine ridges in the area, shallow shear-wave seismic reflection
surveys were carried out on three Rogen moraine ridges in separate fields. Several ground-penetrating radar surveys were also attempted, but due to a combination of silty sand tills and permafrost, electromagnetic wave penetration was insufficient.
New results are discussed to further the understanding of the Rogen moraine ridged landscape and to eventually postulate a formation model for Rogen moraines near the Keewatin Ice Divide in northern Manitoba.
New ice-flow indicators were found
that delimit ice flow to the northeast, east and east-southeast, in addition to known ice-flow indicators trending towards the southeast, south, southwest and west-southwest. These new ice-flow indicators are usually rare and protected features, but
also include fine striations on top of outcrops that signify the youngest regional flows. Not all striations and grooves developed and/or preserved directional indicators and it is hoped that dispersal train analysis, of pebbles and till matrix
geochemistry, will provide additional constraints for relative chronology of the multiple ice-flow directions.