A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada
Abstract The glacial records of the inner‐core regions of the Laurentide Ice Sheet (LIS) document complex yet coherent patterns reflecting ice‐sheet change (e.g. ice‐divide migration), providing unique insights into past glacial conditions. This study develops a conceptual model of subglacial dynami...
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crwiley:10.1002/esp.4957 2024-04-28T08:24:55+00:00 A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada Rice, J.M. Ross, M. Paulen, R.C. Kelley, S.E. Briner, J.P. Government of Ontario 2020 http://dx.doi.org/10.1002/esp.4957 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.4957 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.4957 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/esp.4957 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Earth Surface Processes and Landforms volume 45, issue 13, page 3155-3177 ISSN 0197-9337 1096-9837 Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development journal-article 2020 crwiley https://doi.org/10.1002/esp.4957 2024-04-05T07:43:33Z Abstract The glacial records of the inner‐core regions of the Laurentide Ice Sheet (LIS) document complex yet coherent patterns reflecting ice‐sheet change (e.g. ice‐divide migration), providing unique insights into past glacial conditions. This study develops a conceptual model of subglacial dynamics evolution within a major ice‐dispersal centre of the LIS in northeastern Quebec, Canada using a GIS‐based analysis of the surficial geologic record. Multiple proxies of subglacial conditions (subglacial streamlined landforms, lake density and lake area over thin drift/bedrock) were analysed through grid‐overlay techniques and then classified based on different proxy variables ranging from highly mobile warm‐based to immobile cold‐based conditions. An additional proxy (till blanket) was used to identify areas of thick till deposition, but with few proxies (few lake or landform metrics). Based on local ice‐flow reconstructions, the most ‘relict’ glacial terrain zone (GTZ1) has warm‐based conditions over 66% of its area and is remarkably well preserved, suggesting laterally extensive warm‐based conditions during the oldest identified ice‐flow phase. This relict glacial terrain is partially overprinted by two subsequent ice‐flow phases in spatially restricted zones in the northeast (73% warm‐based), east‐central (41% warm‐based), and northwest (33% warm‐based) of the study area. A zone of more sluggish conditions (only 3% warm‐based) was identified in the highlands at the centre of the study area, characterized by thin till cover, few landforms, yet with large patches of relatively abundant small lakes, indicative of areal scouring. No clear evidence of sustained cold‐based conditions (i.e. high chemical index of alteration values or high 10 Be abundances) was found in the study area. These results suggest that warm‐based conditions (active erosion and/or deposition) were uniformly widespread during the earliest ice‐flow phase, later becoming more spatially restricted with broader sluggish ice conditions. These ... Article in Journal/Newspaper Ice Sheet Wiley Online Library Earth Surface Processes and Landforms 45 13 3155 3177 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development |
spellingShingle |
Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development Rice, J.M. Ross, M. Paulen, R.C. Kelley, S.E. Briner, J.P. A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada |
topic_facet |
Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development |
description |
Abstract The glacial records of the inner‐core regions of the Laurentide Ice Sheet (LIS) document complex yet coherent patterns reflecting ice‐sheet change (e.g. ice‐divide migration), providing unique insights into past glacial conditions. This study develops a conceptual model of subglacial dynamics evolution within a major ice‐dispersal centre of the LIS in northeastern Quebec, Canada using a GIS‐based analysis of the surficial geologic record. Multiple proxies of subglacial conditions (subglacial streamlined landforms, lake density and lake area over thin drift/bedrock) were analysed through grid‐overlay techniques and then classified based on different proxy variables ranging from highly mobile warm‐based to immobile cold‐based conditions. An additional proxy (till blanket) was used to identify areas of thick till deposition, but with few proxies (few lake or landform metrics). Based on local ice‐flow reconstructions, the most ‘relict’ glacial terrain zone (GTZ1) has warm‐based conditions over 66% of its area and is remarkably well preserved, suggesting laterally extensive warm‐based conditions during the oldest identified ice‐flow phase. This relict glacial terrain is partially overprinted by two subsequent ice‐flow phases in spatially restricted zones in the northeast (73% warm‐based), east‐central (41% warm‐based), and northwest (33% warm‐based) of the study area. A zone of more sluggish conditions (only 3% warm‐based) was identified in the highlands at the centre of the study area, characterized by thin till cover, few landforms, yet with large patches of relatively abundant small lakes, indicative of areal scouring. No clear evidence of sustained cold‐based conditions (i.e. high chemical index of alteration values or high 10 Be abundances) was found in the study area. These results suggest that warm‐based conditions (active erosion and/or deposition) were uniformly widespread during the earliest ice‐flow phase, later becoming more spatially restricted with broader sluggish ice conditions. These ... |
author2 |
Government of Ontario |
format |
Article in Journal/Newspaper |
author |
Rice, J.M. Ross, M. Paulen, R.C. Kelley, S.E. Briner, J.P. |
author_facet |
Rice, J.M. Ross, M. Paulen, R.C. Kelley, S.E. Briner, J.P. |
author_sort |
Rice, J.M. |
title |
A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada |
title_short |
A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada |
title_full |
A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada |
title_fullStr |
A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada |
title_full_unstemmed |
A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada |
title_sort |
gis‐based multi‐proxy analysis of the evolution of subglacial dynamics of the quebec–labrador ice dome, northeastern quebec, canada |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/esp.4957 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.4957 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.4957 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/esp.4957 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Earth Surface Processes and Landforms volume 45, issue 13, page 3155-3177 ISSN 0197-9337 1096-9837 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/esp.4957 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
45 |
container_issue |
13 |
container_start_page |
3155 |
op_container_end_page |
3177 |
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1797584921572671488 |