Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada
Abstract Areas of southeastern Alaska and the Queen Charlotte Islands of the northwestern Pacific coast of North America were considered to be ice free during the late Wisconsinan glaciation and glacial refugia existed. However, a glacier extended from mainland North America to the shelfbreak in Dix...
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Cambridge University Press (CUP)
1999
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crcambridgeupr:10.1006/qres.1998.2021 2024-06-23T07:53:00+00:00 Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada Barrie, J. Vaughn Conway, Kim W. 1999 http://dx.doi.org/10.1006/qres.1998.2021 http://api.elsevier.com/content/article/PII:S003358949892021X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949892021X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400034013 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 51, issue 2, page 113-123 ISSN 0033-5894 1096-0287 journal-article 1999 crcambridgeupr https://doi.org/10.1006/qres.1998.2021 2024-06-12T04:02:51Z Abstract Areas of southeastern Alaska and the Queen Charlotte Islands of the northwestern Pacific coast of North America were considered to be ice free during the late Wisconsinan glaciation and glacial refugia existed. However, a glacier extended from mainland North America to the shelfbreak in Dixon Entrance separating Alaska and the Queen Charlotte Islands. Glacial retreat to the east began sometime after 15,000 to 16,000 14 C yr B.P. and ice had completely left Dixon Entrance by 13,500 to 13,000 14 C yr B.P. A rapid sea-level regression occurred soon after deglaciation began, due to isostatic rebound, with relative sea level falling to approximately 150 m below present in central Dixon Entrance, decreasing the size of the inlet by about 30 percent by 12,400 14 C yr B.P. The late Quaternary glacial and postglacial stratigraphic sequence is more than 100 m thick overlying older Pleistocene sediments and Tertiary bedrock. A late Wisconsinan diamicton is overlain by glaciomarine muds formed between approximately 14,400 and 13,000 14 C yr B.P. Contemporaneous with the deposition of the glaciomarine muds an extensive outwash deposit formed off the northern coast of the Queen Charlotte Islands to a present depth of 150 m. During the sea-level lowstand and subsequent transgression, a reworked sand unit was deposited over much of the seafloor to depths greater than 450 m. The unit is exposed at the seafloor over much of the region, suggesting that seabed hydrodynamic energy levels were high after 13,000 14 C yr B.P. and remain so today. Article in Journal/Newspaper glacier glacier* Alaska Cambridge University Press Canada Dixon Entrance ENVELOPE(-132.003,-132.003,54.416,54.416) Pacific Queen Charlotte ENVELOPE(-132.088,-132.088,53.255,53.255) Quaternary Research 51 2 113 123 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Areas of southeastern Alaska and the Queen Charlotte Islands of the northwestern Pacific coast of North America were considered to be ice free during the late Wisconsinan glaciation and glacial refugia existed. However, a glacier extended from mainland North America to the shelfbreak in Dixon Entrance separating Alaska and the Queen Charlotte Islands. Glacial retreat to the east began sometime after 15,000 to 16,000 14 C yr B.P. and ice had completely left Dixon Entrance by 13,500 to 13,000 14 C yr B.P. A rapid sea-level regression occurred soon after deglaciation began, due to isostatic rebound, with relative sea level falling to approximately 150 m below present in central Dixon Entrance, decreasing the size of the inlet by about 30 percent by 12,400 14 C yr B.P. The late Quaternary glacial and postglacial stratigraphic sequence is more than 100 m thick overlying older Pleistocene sediments and Tertiary bedrock. A late Wisconsinan diamicton is overlain by glaciomarine muds formed between approximately 14,400 and 13,000 14 C yr B.P. Contemporaneous with the deposition of the glaciomarine muds an extensive outwash deposit formed off the northern coast of the Queen Charlotte Islands to a present depth of 150 m. During the sea-level lowstand and subsequent transgression, a reworked sand unit was deposited over much of the seafloor to depths greater than 450 m. The unit is exposed at the seafloor over much of the region, suggesting that seabed hydrodynamic energy levels were high after 13,000 14 C yr B.P. and remain so today. |
format |
Article in Journal/Newspaper |
author |
Barrie, J. Vaughn Conway, Kim W. |
spellingShingle |
Barrie, J. Vaughn Conway, Kim W. Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada |
author_facet |
Barrie, J. Vaughn Conway, Kim W. |
author_sort |
Barrie, J. Vaughn |
title |
Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada |
title_short |
Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada |
title_full |
Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada |
title_fullStr |
Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada |
title_full_unstemmed |
Late Quaternary Glaciation and Postglacial Stratigraphy of the Northern Pacific Margin of Canada |
title_sort |
late quaternary glaciation and postglacial stratigraphy of the northern pacific margin of canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1006/qres.1998.2021 http://api.elsevier.com/content/article/PII:S003358949892021X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949892021X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400034013 |
long_lat |
ENVELOPE(-132.003,-132.003,54.416,54.416) ENVELOPE(-132.088,-132.088,53.255,53.255) |
geographic |
Canada Dixon Entrance Pacific Queen Charlotte |
geographic_facet |
Canada Dixon Entrance Pacific Queen Charlotte |
genre |
glacier glacier* Alaska |
genre_facet |
glacier glacier* Alaska |
op_source |
Quaternary Research volume 51, issue 2, page 113-123 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1998.2021 |
container_title |
Quaternary Research |
container_volume |
51 |
container_issue |
2 |
container_start_page |
113 |
op_container_end_page |
123 |
_version_ |
1802644460683657216 |