Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory
Abstract Old Crow tephra is the first extensive Pleistocene tephra unit to be documented in the northwestern part of North America. It has a calc-alkaline dacitic composition with abundant pyroxene, plagioclase, and Fe–Ti oxides, and minor hornblende, biotite, apatite, and zircon. Thin, clear, bubbl...
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Cambridge University Press (CUP)
1983
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crcambridgeupr:10.1016/0033-5894(83)90026-1 2024-06-16T07:42:30+00:00 Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory Westgate, John A. Hamilton, Thomas D. Gorton, Michael P. 1983 http://dx.doi.org/10.1016/0033-5894(83)90026-1 http://api.elsevier.com/content/article/PII:0033589483900261?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589483900261?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940002264X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 19, issue 1, page 38-54 ISSN 0033-5894 1096-0287 journal-article 1983 crcambridgeupr https://doi.org/10.1016/0033-5894(83)90026-1 2024-05-22T12:55:05Z Abstract Old Crow tephra is the first extensive Pleistocene tephra unit to be documented in the northwestern part of North America. It has a calc-alkaline dacitic composition with abundant pyroxene, plagioclase, and Fe–Ti oxides, and minor hornblende, biotite, apatite, and zircon. Thin, clear, bubble-wall fragments are the dominant type of glass shard. This tephra can be recognized by its glass and phenocryst compositions, as determined by X-ray fluorescence, microprobe, and instrumental neutron activation techniques. It has an age between the limits of 60,000 and 120,000 yr, set by 14 C and fission-track measurements, respectively. Old Crow tephra has been recognized in the Koyukuk Basin and Fairbanks region of Alaska, and in the Old Crow Lowlands of the northern Yukon Territory, some 600 km to the east-northeast. The source vent is unknown, but these occurrences, considered in relation to the distant locations of potential Quaternary volcanic sources, demonstrate the widespread distribution of this tephra and underscore its importance as a regional stratigraphic marker. Article in Journal/Newspaper Old Crow Alaska Yukon Cambridge University Press Fairbanks Yukon Quaternary Research 19 1 38 54 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Old Crow tephra is the first extensive Pleistocene tephra unit to be documented in the northwestern part of North America. It has a calc-alkaline dacitic composition with abundant pyroxene, plagioclase, and Fe–Ti oxides, and minor hornblende, biotite, apatite, and zircon. Thin, clear, bubble-wall fragments are the dominant type of glass shard. This tephra can be recognized by its glass and phenocryst compositions, as determined by X-ray fluorescence, microprobe, and instrumental neutron activation techniques. It has an age between the limits of 60,000 and 120,000 yr, set by 14 C and fission-track measurements, respectively. Old Crow tephra has been recognized in the Koyukuk Basin and Fairbanks region of Alaska, and in the Old Crow Lowlands of the northern Yukon Territory, some 600 km to the east-northeast. The source vent is unknown, but these occurrences, considered in relation to the distant locations of potential Quaternary volcanic sources, demonstrate the widespread distribution of this tephra and underscore its importance as a regional stratigraphic marker. |
format |
Article in Journal/Newspaper |
author |
Westgate, John A. Hamilton, Thomas D. Gorton, Michael P. |
spellingShingle |
Westgate, John A. Hamilton, Thomas D. Gorton, Michael P. Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory |
author_facet |
Westgate, John A. Hamilton, Thomas D. Gorton, Michael P. |
author_sort |
Westgate, John A. |
title |
Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory |
title_short |
Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory |
title_full |
Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory |
title_fullStr |
Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory |
title_full_unstemmed |
Old Crow Tephra: A New Late Pleistocene Stratigraphic Marker Across North-Central Alaska and Western Yukon Territory |
title_sort |
old crow tephra: a new late pleistocene stratigraphic marker across north-central alaska and western yukon territory |
publisher |
Cambridge University Press (CUP) |
publishDate |
1983 |
url |
http://dx.doi.org/10.1016/0033-5894(83)90026-1 http://api.elsevier.com/content/article/PII:0033589483900261?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589483900261?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940002264X |
geographic |
Fairbanks Yukon |
geographic_facet |
Fairbanks Yukon |
genre |
Old Crow Alaska Yukon |
genre_facet |
Old Crow Alaska Yukon |
op_source |
Quaternary Research volume 19, issue 1, page 38-54 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(83)90026-1 |
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Quaternary Research |
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19 |
container_issue |
1 |
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38 |
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54 |
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1802009980169093120 |