Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet
Abstract The Pekulney Mountains and adjacent Tanyurer River valley are key regions for examining the nature of glaciation across much of northeast Russia. Twelve new cosmogenic isotope ages and 14 new radiocarbon ages in concert with morphometric analyses and terrace stratigraphy constrain the timin...
Published in: | Quaternary Research |
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Cambridge University Press (CUP)
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crcambridgeupr:10.1016/s0033-5894(03)00058-9 2024-06-23T07:52:07+00:00 Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet Brigham-Grette, Julie Gualtieri, Lyn M. Glushkova, Olga Yu Hamilton, Thomas D. Mostoller, David Kotov, Anatoly 2003 http://dx.doi.org/10.1016/s0033-5894(03)00058-9 http://api.elsevier.com/content/article/PII:S0033589403000589?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589403000589?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400012072 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 59, issue 3, page 386-398 ISSN 0033-5894 1096-0287 journal-article 2003 crcambridgeupr https://doi.org/10.1016/s0033-5894(03)00058-9 2024-06-12T04:04:14Z Abstract The Pekulney Mountains and adjacent Tanyurer River valley are key regions for examining the nature of glaciation across much of northeast Russia. Twelve new cosmogenic isotope ages and 14 new radiocarbon ages in concert with morphometric analyses and terrace stratigraphy constrain the timing of glaciation in this region of central Chukotka. The Sartan Glaciation (Last Glacial Maximum) was limited in extent in the Pekulney Mountains and dates to ∼20,000 yr ago. Cosmogenic isotope ages > 30,000 yr as well as non-finite radiocarbon ages imply an estimated age no younger than the Zyryan Glaciation (early Wisconsinan) for large sets of moraines found in the central Tanyurer Valley. Slope angles on these loess-mantled ridges are less than a few degrees and crest widths are an order of magnitude greater than those found on the younger Sartan moraines. The most extensive moraines in the lower Tanyurer Valley are most subdued implying an even older, probable middle Pleistocene age. This research provides direct field evidence against Grosswald’s Beringian ice-sheet hypothesis. Article in Journal/Newspaper Chukotka Ice Sheet Siberia Cambridge University Press Tanyurer ENVELOPE(174.319,174.319,64.735,64.735) Quaternary Research 59 3 386 398 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract The Pekulney Mountains and adjacent Tanyurer River valley are key regions for examining the nature of glaciation across much of northeast Russia. Twelve new cosmogenic isotope ages and 14 new radiocarbon ages in concert with morphometric analyses and terrace stratigraphy constrain the timing of glaciation in this region of central Chukotka. The Sartan Glaciation (Last Glacial Maximum) was limited in extent in the Pekulney Mountains and dates to ∼20,000 yr ago. Cosmogenic isotope ages > 30,000 yr as well as non-finite radiocarbon ages imply an estimated age no younger than the Zyryan Glaciation (early Wisconsinan) for large sets of moraines found in the central Tanyurer Valley. Slope angles on these loess-mantled ridges are less than a few degrees and crest widths are an order of magnitude greater than those found on the younger Sartan moraines. The most extensive moraines in the lower Tanyurer Valley are most subdued implying an even older, probable middle Pleistocene age. This research provides direct field evidence against Grosswald’s Beringian ice-sheet hypothesis. |
format |
Article in Journal/Newspaper |
author |
Brigham-Grette, Julie Gualtieri, Lyn M. Glushkova, Olga Yu Hamilton, Thomas D. Mostoller, David Kotov, Anatoly |
spellingShingle |
Brigham-Grette, Julie Gualtieri, Lyn M. Glushkova, Olga Yu Hamilton, Thomas D. Mostoller, David Kotov, Anatoly Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet |
author_facet |
Brigham-Grette, Julie Gualtieri, Lyn M. Glushkova, Olga Yu Hamilton, Thomas D. Mostoller, David Kotov, Anatoly |
author_sort |
Brigham-Grette, Julie |
title |
Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet |
title_short |
Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet |
title_full |
Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet |
title_fullStr |
Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet |
title_full_unstemmed |
Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet |
title_sort |
chlorine-36 and 14 c chronology support a limited last glacial maximum across central chukotka, northeastern siberia, and no beringian ice sheet |
publisher |
Cambridge University Press (CUP) |
publishDate |
2003 |
url |
http://dx.doi.org/10.1016/s0033-5894(03)00058-9 http://api.elsevier.com/content/article/PII:S0033589403000589?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589403000589?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400012072 |
long_lat |
ENVELOPE(174.319,174.319,64.735,64.735) |
geographic |
Tanyurer |
geographic_facet |
Tanyurer |
genre |
Chukotka Ice Sheet Siberia |
genre_facet |
Chukotka Ice Sheet Siberia |
op_source |
Quaternary Research volume 59, issue 3, page 386-398 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/s0033-5894(03)00058-9 |
container_title |
Quaternary Research |
container_volume |
59 |
container_issue |
3 |
container_start_page |
386 |
op_container_end_page |
398 |
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1802643328142934016 |