Deglaciation, stratigraphy, transition marine/continental, Estern Canada, Greenland
Impact of the marine/terrestrial ice-margin transition on the reorganization of ice sheets: paleoglaciology and morpho-sedimentary signatures of deglaciation
Beginning and end of thesis:
October 2020 - September 2023
Jean-François Ghienne (University of Strasbourg, France)
Patrick Lajeunesse (University Laval, Canada)
Project description :
Paleo-glaciological reconstructions are important keys to climate studies because they represent the major role of ice sheets in past and present climate systems. The study of the deglaciation sequence when the ice margin changes from a marine to a continental front can provide a better understanding of the different phenomena that significantly impact the reorganisation of the ice sheets at this point in the deglaciation history. These answers will contribute to providing additional information on the consequences of these changes on the climate (evolution of global temperature, rise in sea level, etc.), and may lead to a better understanding and thus a better prediction of the evolution of modern ice sheets (Greenland and Antarctica).
This project aims to analyse the past morphosedimentary records of the last deglaciation that occurred about 21,000 years ago on the North Shore of the St. Lawrence River in eastern Canada. The proposed approach consists of mapping, analysing and dating on a land-sea continuum the landforms (moraines, glacial lineations, etc.) and sediments deposited on both sides of such a marine/continental transition during the last deglaciation. This approach will integrate several datasets with, on land, the analysis of data from remote sensing (LiDAR topography and airborne and satellite photogrammetry), but also bathymetric data (multibeam echosounder), seismostratigraphic profiles and analyses of sediment cores, most of which have already been collected during previous missions. Stratigraphic cross-sections will also be made along the coastline and waterways to provide answers to the question of the deglaciation sequence.
The two main study areas are located on the north coast of the St. Lawrence River in Quebec (Canada) and Disko Bay (Greenland) on similar recent systems.
Glacial delta incised by the Pentecôte River located on the North shore of the Gulf of St. Lawrence (QC, Canada)
E-mail : email@example.com
Université de Strasbourg - École et Observatoire des Sciences de la Terre (EOST)
University of Laval (Québec, Canada) - Faculty of Forestry, Geography and Geomatics - Department of Geography
CNRS - Centre National de Recherche Scientifique
GéOLS (Géologie Océans Lithosphère Sédiments)
5 rue René Descartes, 67084 Strasbourg, France
Pavillon Abitibi-Price, 2405 rue de la Terrasse
Université Laval, Québec (Qc) Canada