Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells
Abstract Aspartic acid (Asp) racemization occurs at a significantly higher rate than isoleucine epimerization and consequently provides better temporal resolution of Arctic marine deposits (from Alaska, Spitsbergen, and Baffin Island). Heating experiments (at 100°C) on the bivalves Mya and Hiatella...
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1996
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crcambridgeupr:10.1006/qres.1996.0018 2024-06-23T07:50:13+00:00 Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells Goodfriend, Glenn A. Brigham-Grette, Julie Miller, Gifford H. 1996 http://dx.doi.org/10.1006/qres.1996.0018 http://api.elsevier.com/content/article/PII:S0033589496900186?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589496900186?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400024686 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 45, issue 2, page 176-187 ISSN 0033-5894 1096-0287 journal-article 1996 crcambridgeupr https://doi.org/10.1006/qres.1996.0018 2024-06-05T04:04:31Z Abstract Aspartic acid (Asp) racemization occurs at a significantly higher rate than isoleucine epimerization and consequently provides better temporal resolution of Arctic marine deposits (from Alaska, Spitsbergen, and Baffin Island). Heating experiments (at 100°C) on the bivalves Mya and Hiatella show the Asp racemization rate decreases with increasing D/L values, as is typical for biogenic carbonates. Based on these experimental racemization rates and rates determined from racemization of samples radiocarbon dated to ca. 10,000–12,000 yr B.P., activation energies for Mya and Hiatella are estimated to be 30.6 and 30.0 kcal/mol, respectively, for Asp racemization, and 29.0 and 29.5 for isoleucine epimerization. Analysis of a time series of Plio–Pleistocene Hiatella from the north coast of Alaska shows that last-interglacial mollusks can be readily distinguished from modern samples by Asp but not by isoleucine. D/L Asp values indicate a younger age for the Fishcreekian transgression than does isoleucine epimerization. For Spitsbergen, D/L Asp shows a slight age difference (ca. 12,000 yr) between two units of the “episode B” interstadial and suggests that the age of these units may be closer to 65,000 than to 80,000 yr B.P., two possible ages suggested by other evidence. The age of the Loks Land Interstadial on Baffin Island is likely to be greater than that indicated by radiocarbon ages. Within deposits from each region, D/L Asp values are less variable among individual shells than isoleucine epimerization values. This may indicate better reliability of Asp for geochronology. Article in Journal/Newspaper Arctic Baffin Island Baffin Loks Land Alaska Spitsbergen Cambridge University Press Arctic Baffin Island Loks Land ENVELOPE(-64.631,-64.631,62.434,62.434) Quaternary Research 45 2 176 187 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Aspartic acid (Asp) racemization occurs at a significantly higher rate than isoleucine epimerization and consequently provides better temporal resolution of Arctic marine deposits (from Alaska, Spitsbergen, and Baffin Island). Heating experiments (at 100°C) on the bivalves Mya and Hiatella show the Asp racemization rate decreases with increasing D/L values, as is typical for biogenic carbonates. Based on these experimental racemization rates and rates determined from racemization of samples radiocarbon dated to ca. 10,000–12,000 yr B.P., activation energies for Mya and Hiatella are estimated to be 30.6 and 30.0 kcal/mol, respectively, for Asp racemization, and 29.0 and 29.5 for isoleucine epimerization. Analysis of a time series of Plio–Pleistocene Hiatella from the north coast of Alaska shows that last-interglacial mollusks can be readily distinguished from modern samples by Asp but not by isoleucine. D/L Asp values indicate a younger age for the Fishcreekian transgression than does isoleucine epimerization. For Spitsbergen, D/L Asp shows a slight age difference (ca. 12,000 yr) between two units of the “episode B” interstadial and suggests that the age of these units may be closer to 65,000 than to 80,000 yr B.P., two possible ages suggested by other evidence. The age of the Loks Land Interstadial on Baffin Island is likely to be greater than that indicated by radiocarbon ages. Within deposits from each region, D/L Asp values are less variable among individual shells than isoleucine epimerization values. This may indicate better reliability of Asp for geochronology. |
format |
Article in Journal/Newspaper |
author |
Goodfriend, Glenn A. Brigham-Grette, Julie Miller, Gifford H. |
spellingShingle |
Goodfriend, Glenn A. Brigham-Grette, Julie Miller, Gifford H. Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells |
author_facet |
Goodfriend, Glenn A. Brigham-Grette, Julie Miller, Gifford H. |
author_sort |
Goodfriend, Glenn A. |
title |
Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells |
title_short |
Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells |
title_full |
Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells |
title_fullStr |
Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells |
title_full_unstemmed |
Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells |
title_sort |
enhanced age resolution of the marine quaternary record in the arctic using aspartic acid racemization dating of bivalve shells |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1006/qres.1996.0018 http://api.elsevier.com/content/article/PII:S0033589496900186?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589496900186?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400024686 |
long_lat |
ENVELOPE(-64.631,-64.631,62.434,62.434) |
geographic |
Arctic Baffin Island Loks Land |
geographic_facet |
Arctic Baffin Island Loks Land |
genre |
Arctic Baffin Island Baffin Loks Land Alaska Spitsbergen |
genre_facet |
Arctic Baffin Island Baffin Loks Land Alaska Spitsbergen |
op_source |
Quaternary Research volume 45, issue 2, page 176-187 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1996.0018 |
container_title |
Quaternary Research |
container_volume |
45 |
container_issue |
2 |
container_start_page |
176 |
op_container_end_page |
187 |
_version_ |
1802641091751575552 |