Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology
Abstract The late Cenozoic deposits of central Yukon contain numerous distal tephra beds, derived from vents in the Wrangell Mountains and Aleutian arc–Alaska Peninsula region. We use a few of these tephra beds to gain a better understanding on the timing of extensive Pleistocene glaciations that af...
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Cambridge University Press (CUP)
2001
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crcambridgeupr:10.1006/qres.2001.2274 2024-06-23T07:52:21+00:00 Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology Westgate, John A. Preece, Shari J. Froese, Duane G. Walter, Robert C. Sandhu, Amanjit S. Schweger, Charles E. 2001 http://dx.doi.org/10.1006/qres.2001.2274 http://api.elsevier.com/content/article/PII:S0033589401922744?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922744?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940001036X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 56, issue 3, page 335-348 ISSN 0033-5894 1096-0287 journal-article 2001 crcambridgeupr https://doi.org/10.1006/qres.2001.2274 2024-06-05T04:03:31Z Abstract The late Cenozoic deposits of central Yukon contain numerous distal tephra beds, derived from vents in the Wrangell Mountains and Aleutian arc–Alaska Peninsula region. We use a few of these tephra beds to gain a better understanding on the timing of extensive Pleistocene glaciations that affected this area. Exposures at Fort Selkirk show that the Cordilleran Ice Sheet advanced close to the outer limit of glaciation about 1.5 myr ago. At the Midnight Dome Terrace, near Dawson City, exposed outwash gravel, aeolian sand, and loess, related to valley glaciers in the adjacent Ogilvie Mountains, are of the same age. Reid glacial deposits at Ash Bend on the Stewart River are older than oxygen isotope stage (OIS) 6 and likely of OIS 8 age, that is, about 250,000 yr B.P. Supporting evidence for this chronology comes from major peaks in the rates of terrigeneous sediment input into the Gulf of Alaska at 1.5 and 0.25 myr B.P. Article in Journal/Newspaper Dawson glaciers Ice Sheet Ogilvie Mountains Alaska Yukon Cambridge University Press Ash Bend ENVELOPE(-137.254,-137.254,63.500,63.500) Dawson City ENVELOPE(-139.433,-139.433,64.060,64.060) Fort Selkirk ENVELOPE(-137.390,-137.390,62.775,62.775) Gulf of Alaska Midnight Dome ENVELOPE(-139.393,-139.393,64.072,64.072) Ogilvie ENVELOPE(-139.746,-139.746,63.563,63.563) Ogilvie Mountains ENVELOPE(-138.254,-138.254,64.583,64.583) Yukon Quaternary Research 56 3 335 348 |
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Open Polar |
collection |
Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract The late Cenozoic deposits of central Yukon contain numerous distal tephra beds, derived from vents in the Wrangell Mountains and Aleutian arc–Alaska Peninsula region. We use a few of these tephra beds to gain a better understanding on the timing of extensive Pleistocene glaciations that affected this area. Exposures at Fort Selkirk show that the Cordilleran Ice Sheet advanced close to the outer limit of glaciation about 1.5 myr ago. At the Midnight Dome Terrace, near Dawson City, exposed outwash gravel, aeolian sand, and loess, related to valley glaciers in the adjacent Ogilvie Mountains, are of the same age. Reid glacial deposits at Ash Bend on the Stewart River are older than oxygen isotope stage (OIS) 6 and likely of OIS 8 age, that is, about 250,000 yr B.P. Supporting evidence for this chronology comes from major peaks in the rates of terrigeneous sediment input into the Gulf of Alaska at 1.5 and 0.25 myr B.P. |
format |
Article in Journal/Newspaper |
author |
Westgate, John A. Preece, Shari J. Froese, Duane G. Walter, Robert C. Sandhu, Amanjit S. Schweger, Charles E. |
spellingShingle |
Westgate, John A. Preece, Shari J. Froese, Duane G. Walter, Robert C. Sandhu, Amanjit S. Schweger, Charles E. Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology |
author_facet |
Westgate, John A. Preece, Shari J. Froese, Duane G. Walter, Robert C. Sandhu, Amanjit S. Schweger, Charles E. |
author_sort |
Westgate, John A. |
title |
Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology |
title_short |
Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology |
title_full |
Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology |
title_fullStr |
Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology |
title_full_unstemmed |
Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology |
title_sort |
dating early and middle (reid) pleistocene glaciations in central yukon by tephrochronology |
publisher |
Cambridge University Press (CUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1006/qres.2001.2274 http://api.elsevier.com/content/article/PII:S0033589401922744?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922744?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940001036X |
long_lat |
ENVELOPE(-137.254,-137.254,63.500,63.500) ENVELOPE(-139.433,-139.433,64.060,64.060) ENVELOPE(-137.390,-137.390,62.775,62.775) ENVELOPE(-139.393,-139.393,64.072,64.072) ENVELOPE(-139.746,-139.746,63.563,63.563) ENVELOPE(-138.254,-138.254,64.583,64.583) |
geographic |
Ash Bend Dawson City Fort Selkirk Gulf of Alaska Midnight Dome Ogilvie Ogilvie Mountains Yukon |
geographic_facet |
Ash Bend Dawson City Fort Selkirk Gulf of Alaska Midnight Dome Ogilvie Ogilvie Mountains Yukon |
genre |
Dawson glaciers Ice Sheet Ogilvie Mountains Alaska Yukon |
genre_facet |
Dawson glaciers Ice Sheet Ogilvie Mountains Alaska Yukon |
op_source |
Quaternary Research volume 56, issue 3, page 335-348 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.2001.2274 |
container_title |
Quaternary Research |
container_volume |
56 |
container_issue |
3 |
container_start_page |
335 |
op_container_end_page |
348 |
_version_ |
1802643624116092928 |