Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic
New georaorphic, sedimentologic, and chronologic data are used to reconstruct late Quaternary ice-sheet flow patterns, deglaciation, and isostatic uplift along the largest marine trough connecting the Laurentide Ice Sheet with the North Atlantic Ocean. The Lake Harbour region was targeted for study...
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crcansciencepubl:10.1139/e96-113 2024-04-07T07:50:33+00:00 Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic Manley, William F. 1996 http://dx.doi.org/10.1139/e96-113 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-113 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 33, issue 11, page 1499-1510 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1996 crcansciencepubl https://doi.org/10.1139/e96-113 2024-03-08T00:37:48Z New georaorphic, sedimentologic, and chronologic data are used to reconstruct late Quaternary ice-sheet flow patterns, deglaciation, and isostatic uplift along the largest marine trough connecting the Laurentide Ice Sheet with the North Atlantic Ocean. The Lake Harbour region was targeted for study given its potential to record flow from several ice-dispersal centers. Striations and sediment provenance indicators define flow patterns. Thirty-four radiocarbon dates constrain a chronology of events. Centuries or millennia(?) before deglaciation, a southeast-flowing ice stream impinged on southernmost Big Island, as recorded by a single striation site and delimited in extent by geomorphic evidence of cold-based ice. During the Cockburn Substagc (9000–8000 BP), the region was scoured by southward to southwestward flow from an ice cap on Meta Incognita Peninsula, as recorded by 60 striation sites along 200 km of coastline. Carbonate erratics are uncommon in till above the marine limit. Where present, they suggest that southward flow reworked older drift. At about 8200 BP, the area was dcglaciated, and the marine limit was established at elevations of 67–141 m above high tide. Iceberg calving and sediment discharge from an ice margin in Ungava Bay, Hudson Bay, or Foxe Basin then blanketed the area with limestone-rich glaciomarinc sediment. Afterward, the region experienced slow but sustained emergence. The data revise the maximum lateral extent of a Late Wisconsinan ice stream in Hudson Strait and emphasize the extent of a late-glacial ice cap on western Meta Incognita Peninsula. Article in Journal/Newspaper Arctic Baffin Island Baffin Foxe Basin Hudson Bay Hudson Strait Ice cap Ice Sheet Iceberg* Meta Incognita Peninsula North Atlantic Ungava Bay Canadian Science Publishing Arctic Hudson Bay Baffin Island Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Ungava Bay ENVELOPE(-67.489,-67.489,59.498,59.498) Foxe Basin ENVELOPE(-77.918,-77.918,65.931,65.931) Cockburn ENVELOPE(-62.295,-62.295,-64.018,-64.018) Lake Harbour ENVELOPE(-69.848,-69.848,62.834,62.834) Meta Incognita Peninsula ENVELOPE(-68.498,-68.498,62.751,62.751) Canadian Journal of Earth Sciences 33 11 1499 1510 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Manley, William F. Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic |
topic_facet |
General Earth and Planetary Sciences |
description |
New georaorphic, sedimentologic, and chronologic data are used to reconstruct late Quaternary ice-sheet flow patterns, deglaciation, and isostatic uplift along the largest marine trough connecting the Laurentide Ice Sheet with the North Atlantic Ocean. The Lake Harbour region was targeted for study given its potential to record flow from several ice-dispersal centers. Striations and sediment provenance indicators define flow patterns. Thirty-four radiocarbon dates constrain a chronology of events. Centuries or millennia(?) before deglaciation, a southeast-flowing ice stream impinged on southernmost Big Island, as recorded by a single striation site and delimited in extent by geomorphic evidence of cold-based ice. During the Cockburn Substagc (9000–8000 BP), the region was scoured by southward to southwestward flow from an ice cap on Meta Incognita Peninsula, as recorded by 60 striation sites along 200 km of coastline. Carbonate erratics are uncommon in till above the marine limit. Where present, they suggest that southward flow reworked older drift. At about 8200 BP, the area was dcglaciated, and the marine limit was established at elevations of 67–141 m above high tide. Iceberg calving and sediment discharge from an ice margin in Ungava Bay, Hudson Bay, or Foxe Basin then blanketed the area with limestone-rich glaciomarinc sediment. Afterward, the region experienced slow but sustained emergence. The data revise the maximum lateral extent of a Late Wisconsinan ice stream in Hudson Strait and emphasize the extent of a late-glacial ice cap on western Meta Incognita Peninsula. |
format |
Article in Journal/Newspaper |
author |
Manley, William F. |
author_facet |
Manley, William F. |
author_sort |
Manley, William F. |
title |
Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic |
title_short |
Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic |
title_full |
Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic |
title_fullStr |
Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic |
title_full_unstemmed |
Late-glacial flow patterns, deglaciation, and postglacial emergence of south-central Baffin Island and the north-central coast of Hudson Strait, eastern Canadian Arctic |
title_sort |
late-glacial flow patterns, deglaciation, and postglacial emergence of south-central baffin island and the north-central coast of hudson strait, eastern canadian arctic |
publisher |
Canadian Science Publishing |
publishDate |
1996 |
url |
http://dx.doi.org/10.1139/e96-113 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-113 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-67.489,-67.489,59.498,59.498) ENVELOPE(-77.918,-77.918,65.931,65.931) ENVELOPE(-62.295,-62.295,-64.018,-64.018) ENVELOPE(-69.848,-69.848,62.834,62.834) ENVELOPE(-68.498,-68.498,62.751,62.751) |
geographic |
Arctic Hudson Bay Baffin Island Hudson Hudson Strait Ungava Bay Foxe Basin Cockburn Lake Harbour Meta Incognita Peninsula |
geographic_facet |
Arctic Hudson Bay Baffin Island Hudson Hudson Strait Ungava Bay Foxe Basin Cockburn Lake Harbour Meta Incognita Peninsula |
genre |
Arctic Baffin Island Baffin Foxe Basin Hudson Bay Hudson Strait Ice cap Ice Sheet Iceberg* Meta Incognita Peninsula North Atlantic Ungava Bay |
genre_facet |
Arctic Baffin Island Baffin Foxe Basin Hudson Bay Hudson Strait Ice cap Ice Sheet Iceberg* Meta Incognita Peninsula North Atlantic Ungava Bay |
op_source |
Canadian Journal of Earth Sciences volume 33, issue 11, page 1499-1510 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e96-113 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
33 |
container_issue |
11 |
container_start_page |
1499 |
op_container_end_page |
1510 |
_version_ |
1795665276326379520 |