Tommy Tremblay

Canada-Nunavut Geoscience Office, Iqaluit

Le présent bulletin offre une synthèse des connaissances et des données sur la géologiedes formations superficielles produites par le programme Géocartographie de l’énergie et des minéraux(GEM) au cours de la dernière décennie, et fournit une compréhension mise à jour de la nature, de ladistribution et de l’histoire des dépôts superficiels dans div...

A new glacial geomorphology map covers approximately 415 000 km2 in a core region of theLaurentide Ice Sheet in Nunavut. The compilation builds on recent and legacy maps and is supplementedby visual digitization of glaciogenic features using high-resolution digital elevation (ArcticDEM) andLandsat 8 images. From this unprecedented, detailed invento...

This bulletin summarizes surficial geology knowledge and data produced by the Geo-mapping for Energy and Minerals (GEM) program in the last decade and provides an updated understanding of the nature, distribution, and history of surficial deposits in various glacial terrain types of Canada's North. The advancement in various aspects of surficial ge...

As part of the Rae Glacial Synthesis project completed under the Geoscience for Energy and Minerals (GEM) Program, high resolution imagery was used for mapping new glacial features and recognizing coherent patterns of landform development in the Keewatin region. The new mapping builds on digitally converted legacy surficial geology maps and reunite...

Relict glacial terrains were recently identified in large areas formerly covered by the northern portion of the Keewatin Ice Divide in the Kivalliq Region of Nunavut west of Hudson Bay. A gradual transition in the preservation of these relict terrains, based on geomorphology, elevation, drainage network, lake density, weathering, and terrestrial co...

A new glacial geomorphology map covers approximately 415,000 km2 in a core region of the Laurentide Ice Sheet in Nunavut. The compilation builds on recent and legacy maps and is supplemented by visual digitization of glacigenic features using high-resolution digital elevation data (ArcticDEM) and Landsat 8 images. From this unprecedented, detailed...

Ice flow indicators and till compositional data from 2017 and 2018 field seasons in the Keewatin region of Nunavut and eastern Northwest Territories, Canada

This publication contains geospatial information about the glacial geomorphology of central mainland Nunavut between 60˚ and 68˚N west of Hudson Bay as far as 100˚W, and released as Geological Survey of Canada Open File 8717 (version 2020). The geospatial information includes glacial features, field datasets and interpreted glacial landsystems prov...

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 invento...

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 reso...

In 2018, archived Geological Survey of Canada lake sediment samples from west-central Baffin Island, Nunavut were reanalyzed by the Government of Nunavut through the Canada-Nunavut Geoscience Office in cooperation with the Geological Survey of Canada. By re-examining the samples, it was possible to i) analyze for a larger range of elements (66 in 2...

Limited baseline knowledge about the marine geology of the seabed of inner Frobisher Bay poses a challenge to coastal and seabed infrastructure for the City of Iqaluit. Over the past four years, the area covered by targeted, high-resolution multibeam bathymetric mapping has increased around the southeastern part of Baffin Island, allowing to better...

Surficial geology of the Châteauguay River area, Québec, from data associated with: Tremblay, T. 2008: Hydrostratigraphie et géologie du Quaternaire dans le bassin-versant de la rivière Châteauguay, Québec. Université du Québec à Montréal, Dpt. des sciences de la Terre, mémoire M.Sc., p.224 p.

This publication summarizes the 2017 field work completed in the Baker Lake and Arviat areas, mainland Nunavut, as part of the GEM-2 Rae Synthesis of Glacial History and Dynamics Activity in the interior of the Keewatin Sector of the Laurentide Ice Sheet. Field work consisted of targeted mapping of glacial flow indicators to resolve the relative ic...

The Sylvia Grinnell Lake area project is a collaborative activity between the Canada-Nunavut Geoscience Office, the Geological Survey of Canada (Geo-mapping for Energy and Minerals program), the Nunavut Research Institute and Carleton University. The study area is located north of Iqaluit, and covers 16 000 km 2 over NTS map areas 25N, 26C and F. T...

Field methodology and preliminary results of field season 2016

Presentation of some of the preliminary results from our project that is part of the ArcticNet’s Water Security and Quality in a Changing Arctic program led by Queen’s University. We are looking at the impact of geomorphic controls on groundwater discharge patterns and thermal dynamics within the Niaqunguk (Apex) River watershed.

The localization of groundwater input in the Apex River have been possible by using groundwater tracers (temperature, specific conductance). The success of this method depends on the contrast between groundwater and surface water characteristic, causing anomalies in surface water characteristics when groundwater discharge occurs (Stonestrom, 2003,...

The Sylvia Grinnell Lake area project is a collaborative activity between the Canada-Nunavut Geoscience Office, the Geological Survey of Canada (Geo-mapping for Energy and Minerals program), Nunavut Research Institute and Carleton University. The study area for summer 2015 is located north of Iqaluit, and covers 16 000 km 2 over NTS map areas 25N,...

Three consecutive years of seasonal surface displacement over Iqaluit, Nunavut, were derived using Differential Interferometric Synthetic Aperture Radar (DInSAR). Results show that low displacement is associated with bedrock and coarse sediments. Finer sediments, more likely to be ice-rich, show higher values of displacement. In addition to ground...

A high-resolution seismic reflection survey was carried out in the Chateauguay River watershed in Quebec, Canada. The seismic profiles extend across a buried valley filled with till and marine clays with the objective of defining the spatial extent of stratified materials associated with the buried portion of the Mercier esker. The acquired knowled...

Groundwater recharge, groundwater-surface water interaction, and protection and management of the groundwater resource are strongly constrained by the geological nature of the substratum. A grid-oriented technique has been developed in order to build a 3D stratigraphic model of the Quaternary sediments overlying a regional fractured rock aquifer. T...

This study is part of the Canada-Nunavut Geoscience Office's Hall Peninsula Integrated Geoscience Program, a multiyear bedrock and surficial geologymapping program. This paper presents the surficial geology component of the program conducted during the 2013 field season, completing a two-year program covering NTS map areas 25I, J, O, P, 26A and B a...

Hall Peninsula, located on Baffin Island, is characterized by a bouldery cover on the plateau, and bedrock outcrops eroded by glaciers in the valleys and along the coast. The last glaciation left traces of erosion and deposits of glacial sediments (till). Regions of intense glacial activity was delimited along the coast and in the vicinity of large...

Pleistocene ice streams of Lancaster Strait and Boothia Bay are important because of their effects on global climate, through meltwater output and icebergs calving in the Baffin Bay. Important concepts of ice streams genesis were developed from numerous studies of glacial geology of this area. Study of relative chronology and intensity of multiples...

2) Illinois State Geol Survey, 615 E Peabody Dr, Champaign, IL 61820-6964 Complex sequences of ice marginal and frontal deposits have been mapped and documented in the Saint-Fran9ois and Chaudiere river valleys, north of the international border. In most cases, these sediments and landforms as well as other geomorphological features, are valuable i...

Six marine sediment cores from the Gulf of Lions continental slope (700–1700 m water depth) were analyzed for stable lead isotopes and 210 Pb geochronology in order to reconstruct lead atmospheric fallout pattern during the last century. The detrital lead contribution is 25 lg g À1 and the mean sediment anthropogenic inventory is 110 ± 7 lg cm À2 ,...

The compilation of regional-scale (1:100 k-1:250 k) surficial geology maps for Canada north of 60º represents a key component of current and recent GSC, CNGO and NTGO multi-disciplinary projects in the Northwest Territories and Nunavut. The production and release of surficial geology maps, thematic maps and related databases formed an integrated pa...

Une étude portant sur la géologie du Quaternaire dans la portion canadienne du bassin-versant de la rivière Châteauguay a été entreprise dans le cadre d'un programme d'étude sur les eaux souterraines mené conjointement par la Commission géologique du Canada, l'INRS-ETE (Institut national de recherche scientifique-Eau, Terre et Environnement) et le...

The Potsdam sandstone aquifer of Cambrian age straddles southern Quebec and northern New York in a region known for its abundant and good quality groundwater, a resource that recently has been coveted by several bottling companies. The potential conflicts and concerns of the mainly rural and groundwater dependent population about the possible overu...