The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska
Abstract An 18-m-high coastal bluff at Togiak Bay (northwestern Bristol Bay, southwestern Alaska) exposes marine, lacustrine, fluvial, glacial, volcanic, and organic deposits that record the ∼50,000-year-long transition from the peak of the last interglaciation to the early Wisconsin glaciation. The...
Published in: | Quaternary Research |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2001
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1006/qres.2001.2214 http://api.elsevier.com/content/article/PII:S0033589401922148?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922148?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400028349 |
id |
crcambridgeupr:10.1006/qres.2001.2214 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1006/qres.2001.2214 2024-06-09T07:46:42+00:00 The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska Kaufman, Darrell S. Manley, William F. Wolfe, Alexander P. Hu, Feng Sheng Preece, Shari J. Westgate, John A. Forman, Steve L. 2001 http://dx.doi.org/10.1006/qres.2001.2214 http://api.elsevier.com/content/article/PII:S0033589401922148?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922148?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400028349 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 55, issue 2, page 190-202 ISSN 0033-5894 1096-0287 journal-article 2001 crcambridgeupr https://doi.org/10.1006/qres.2001.2214 2024-05-15T13:10:22Z Abstract An 18-m-high coastal bluff at Togiak Bay (northwestern Bristol Bay, southwestern Alaska) exposes marine, lacustrine, fluvial, glacial, volcanic, and organic deposits that record the ∼50,000-year-long transition from the peak of the last interglaciation to the early Wisconsin glaciation. The base of the section is dominated by stratified sand and silt extending up to 4.3 m above sea level; marine diatoms are present, and pollen assemblages are characterized by relatively high percentages of Picea, Alnus , and Betula and low percentages of Poaceae and Cyperaceae. The marine sediment was probably deposited during the peak of marine oxygen-isotope stage (OIS) 5e. An infrared stimulated luminescence (IRSL) age of 151,000±13,000 yr from near the base of the exposure is permissive of this correlation. The marine sand and silt are overlain by 0.8 m of peaty silt with diatoms that record a transition from marine to lacustrine conditions. During this interval, Poaceae and Cyperaceae dominate the pollen assemblages, and Picea and shrubs are nearly absent, suggesting that herb tundra occupied the landscape. This interval probably encompasses OIS 5d on the basis of the herb tundra and an IRSL age of 119,000±10,000 yr from 60 cm below the marine/lacustrine transition. The organic mud is overlain by 3.1 m of stratified sand and organic silt that apparently record shallowing of the lake; reappearance of spruce and shrubs (=OIS 5c?); and subsequent deepening of the lake (=OIS 5b?); followed by aggradation of a floodplain (=OIS 5a?), which was dry at the time basaltic lava buried the site. Thermoluminescence analyses on lava-baked sediment indicate that the eruption occurred 70,000±10,000 yr ago. Sometime thereafter, but prior to 53,600 14 C yr B.P. an outlet of the Ahklun Mountains ice cap advanced over the site and deposited ∼7 m of bouldery ice-contact drift. The sedimentary sequence contains at least four tephra beds. Major- and trace-element chemistry provide a basis for correlating two of the tephras with tephra ... Article in Journal/Newspaper Ice cap Tundra Alaska Cambridge University Press Quaternary Research 55 2 190 202 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract An 18-m-high coastal bluff at Togiak Bay (northwestern Bristol Bay, southwestern Alaska) exposes marine, lacustrine, fluvial, glacial, volcanic, and organic deposits that record the ∼50,000-year-long transition from the peak of the last interglaciation to the early Wisconsin glaciation. The base of the section is dominated by stratified sand and silt extending up to 4.3 m above sea level; marine diatoms are present, and pollen assemblages are characterized by relatively high percentages of Picea, Alnus , and Betula and low percentages of Poaceae and Cyperaceae. The marine sediment was probably deposited during the peak of marine oxygen-isotope stage (OIS) 5e. An infrared stimulated luminescence (IRSL) age of 151,000±13,000 yr from near the base of the exposure is permissive of this correlation. The marine sand and silt are overlain by 0.8 m of peaty silt with diatoms that record a transition from marine to lacustrine conditions. During this interval, Poaceae and Cyperaceae dominate the pollen assemblages, and Picea and shrubs are nearly absent, suggesting that herb tundra occupied the landscape. This interval probably encompasses OIS 5d on the basis of the herb tundra and an IRSL age of 119,000±10,000 yr from 60 cm below the marine/lacustrine transition. The organic mud is overlain by 3.1 m of stratified sand and organic silt that apparently record shallowing of the lake; reappearance of spruce and shrubs (=OIS 5c?); and subsequent deepening of the lake (=OIS 5b?); followed by aggradation of a floodplain (=OIS 5a?), which was dry at the time basaltic lava buried the site. Thermoluminescence analyses on lava-baked sediment indicate that the eruption occurred 70,000±10,000 yr ago. Sometime thereafter, but prior to 53,600 14 C yr B.P. an outlet of the Ahklun Mountains ice cap advanced over the site and deposited ∼7 m of bouldery ice-contact drift. The sedimentary sequence contains at least four tephra beds. Major- and trace-element chemistry provide a basis for correlating two of the tephras with tephra ... |
format |
Article in Journal/Newspaper |
author |
Kaufman, Darrell S. Manley, William F. Wolfe, Alexander P. Hu, Feng Sheng Preece, Shari J. Westgate, John A. Forman, Steve L. |
spellingShingle |
Kaufman, Darrell S. Manley, William F. Wolfe, Alexander P. Hu, Feng Sheng Preece, Shari J. Westgate, John A. Forman, Steve L. The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska |
author_facet |
Kaufman, Darrell S. Manley, William F. Wolfe, Alexander P. Hu, Feng Sheng Preece, Shari J. Westgate, John A. Forman, Steve L. |
author_sort |
Kaufman, Darrell S. |
title |
The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska |
title_short |
The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska |
title_full |
The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska |
title_fullStr |
The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska |
title_full_unstemmed |
The Last Interglacial to Glacial Transition, Togiak Bay, Southwestern Alaska |
title_sort |
last interglacial to glacial transition, togiak bay, southwestern alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1006/qres.2001.2214 http://api.elsevier.com/content/article/PII:S0033589401922148?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589401922148?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400028349 |
genre |
Ice cap Tundra Alaska |
genre_facet |
Ice cap Tundra Alaska |
op_source |
Quaternary Research volume 55, issue 2, page 190-202 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.2001.2214 |
container_title |
Quaternary Research |
container_volume |
55 |
container_issue |
2 |
container_start_page |
190 |
op_container_end_page |
202 |
_version_ |
1801376661495611392 |