lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins
Correlations of isotopic and palynological records from deep sea cores in Baffin Bay and Labrador Sea with terrestrial palynological sequences, supported by a few Th/U chronological controls, allow the establishment of a regional climatostratigraphic scheme for the Late Pleistocene climatic fluctuat...
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1989
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fterudit:oai:erudit.org:032783ar 2023-05-15T15:34:59+02:00 lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins Hillaire-Marcel, Claude de Vernal, Anne 1989 http://id.erudit.org/iderudit/032783ar https://doi.org/10.7202/032783ar en eng Les Presses de l'Université de Montréal Érudit Géographie physique et Quaternaire vol. 43 no. 3 (1989) http://id.erudit.org/iderudit/032783ar doi:10.7202/032783ar Tous droits réservés © Les Presses de l'Université de Montréal, 1989 text 1989 fterudit https://doi.org/10.7202/032783ar 2022-09-24T23:13:41Z Correlations of isotopic and palynological records from deep sea cores in Baffin Bay and Labrador Sea with terrestrial palynological sequences, supported by a few Th/U chronological controls, allow the establishment of a regional climatostratigraphic scheme for the Late Pleistocene climatic fluctuations in eastern Canada. During the climatic optimum of isotopic substage 5e, warmer conditions than present prevailed both on land and in oceanic surface water masses. The 5e/5d transition is marked by an abrupt shift in 818O values in Baffin Bay and Labrador Sea as a consequence of ice growth over circumpolar areas of northeastern Canada. From substage 5d to substage 5a, the Baffin Bay border lands experienced glacial conditions while subarctic to cool-temperate and humid climates persisted over Labrador Sea and Atlantic Canada. A short (<104yrs) stage 4 is recorded in deep sea cores with high 8'8O values. It corresponds to the Early Wisconsinan southward extension of the Laurentide Ice Sheet dated at ca. 80,000 yrs in the central St. Lawrence Lowland. There is no clear evidence of full glacial conditions in the Atlantic Provinces during this episode. Stage 3 (Middle Wisconsinan) corresponds in the isotopic records to large oscillations in 818O values suggesting meltwater transits in both Baffin Bay and Labrador Sea. The ice cover remained relatively extensive over eastern Canada, although some areas experienced ice-marginal conditions : in the Atlantic Provinces, notably on Cape Breton Island, hemiarctic to subarctic climate is inferred from palynological records; in the Appalachian foothills of Québec glacial Lake Gayhurst developed some 46,000 yrs ago. During isotopic stage 2 (Late Wisconsinan), the Laurentide Ice Sheet reached its maximum extent while satellitic ice-caps developed over the Atlantic Provinces. In deep sea cores, high 818O values mark the full glacial conditions of isotopic stage 2, although slightly lower values in western Labrador Sea indicate discrete but continuous meltwater influxes. An ... Text Baffin Bay Baffin Bay Baffin Breton Island Ice Sheet Labrador Sea Subarctic Érudit.org (Université Montréal) Baffin Bay Breton Island ENVELOPE(141.383,141.383,-66.800,-66.800) Canada Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Géographie physique et Quaternaire 43 3 263 290 |
institution |
Open Polar |
collection |
Érudit.org (Université Montréal) |
op_collection_id |
fterudit |
language |
English |
description |
Correlations of isotopic and palynological records from deep sea cores in Baffin Bay and Labrador Sea with terrestrial palynological sequences, supported by a few Th/U chronological controls, allow the establishment of a regional climatostratigraphic scheme for the Late Pleistocene climatic fluctuations in eastern Canada. During the climatic optimum of isotopic substage 5e, warmer conditions than present prevailed both on land and in oceanic surface water masses. The 5e/5d transition is marked by an abrupt shift in 818O values in Baffin Bay and Labrador Sea as a consequence of ice growth over circumpolar areas of northeastern Canada. From substage 5d to substage 5a, the Baffin Bay border lands experienced glacial conditions while subarctic to cool-temperate and humid climates persisted over Labrador Sea and Atlantic Canada. A short (<104yrs) stage 4 is recorded in deep sea cores with high 8'8O values. It corresponds to the Early Wisconsinan southward extension of the Laurentide Ice Sheet dated at ca. 80,000 yrs in the central St. Lawrence Lowland. There is no clear evidence of full glacial conditions in the Atlantic Provinces during this episode. Stage 3 (Middle Wisconsinan) corresponds in the isotopic records to large oscillations in 818O values suggesting meltwater transits in both Baffin Bay and Labrador Sea. The ice cover remained relatively extensive over eastern Canada, although some areas experienced ice-marginal conditions : in the Atlantic Provinces, notably on Cape Breton Island, hemiarctic to subarctic climate is inferred from palynological records; in the Appalachian foothills of Québec glacial Lake Gayhurst developed some 46,000 yrs ago. During isotopic stage 2 (Late Wisconsinan), the Laurentide Ice Sheet reached its maximum extent while satellitic ice-caps developed over the Atlantic Provinces. In deep sea cores, high 818O values mark the full glacial conditions of isotopic stage 2, although slightly lower values in western Labrador Sea indicate discrete but continuous meltwater influxes. An ... |
format |
Text |
author |
Hillaire-Marcel, Claude de Vernal, Anne |
spellingShingle |
Hillaire-Marcel, Claude de Vernal, Anne lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins |
author_facet |
Hillaire-Marcel, Claude de Vernal, Anne |
author_sort |
Hillaire-Marcel, Claude |
title |
lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins |
title_short |
lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins |
title_full |
lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins |
title_fullStr |
lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins |
title_full_unstemmed |
lsotopic and Palynological Records of the Late Pleistocene in Eastern Canada and Adjacent Ocean Basins |
title_sort |
lsotopic and palynological records of the late pleistocene in eastern canada and adjacent ocean basins |
publisher |
Les Presses de l'Université de Montréal |
publishDate |
1989 |
url |
http://id.erudit.org/iderudit/032783ar https://doi.org/10.7202/032783ar |
long_lat |
ENVELOPE(141.383,141.383,-66.800,-66.800) ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Baffin Bay Breton Island Canada Glacial Lake |
geographic_facet |
Baffin Bay Breton Island Canada Glacial Lake |
genre |
Baffin Bay Baffin Bay Baffin Breton Island Ice Sheet Labrador Sea Subarctic |
genre_facet |
Baffin Bay Baffin Bay Baffin Breton Island Ice Sheet Labrador Sea Subarctic |
op_relation |
Géographie physique et Quaternaire vol. 43 no. 3 (1989) http://id.erudit.org/iderudit/032783ar doi:10.7202/032783ar |
op_rights |
Tous droits réservés © Les Presses de l'Université de Montréal, 1989 |
op_doi |
https://doi.org/10.7202/032783ar |
container_title |
Géographie physique et Quaternaire |
container_volume |
43 |
container_issue |
3 |
container_start_page |
263 |
op_container_end_page |
290 |
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1766365236630126592 |