Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores
The general lack of an age-diagnostic biostratigraphy in the Neogene sediments of the abyssal Arctic Ocean has emphasized the importance of magnetostratigraphy in providing chronostratigraphic control in these sediments. Sedimentation rates interpreted from early magnetostratigraphic studies of core...
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Cambridge University Press (CUP)
1988
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Online Access: | http://dx.doi.org/10.1016/0033-5894(88)90070-1 http://api.elsevier.com/content/article/PII:0033589488900701?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589488900701?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400018706 |
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crcambridgeupr:10.1016/0033-5894(88)90070-1 2024-06-09T07:43:49+00:00 Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores Witte, William K. Kent, Dennis V. 1988 http://dx.doi.org/10.1016/0033-5894(88)90070-1 http://api.elsevier.com/content/article/PII:0033589488900701?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589488900701?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400018706 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 29, issue 1, page 43-53 ISSN 0033-5894 1096-0287 journal-article 1988 crcambridgeupr https://doi.org/10.1016/0033-5894(88)90070-1 2024-05-15T13:08:05Z The general lack of an age-diagnostic biostratigraphy in the Neogene sediments of the abyssal Arctic Ocean has emphasized the importance of magnetostratigraphy in providing chronostratigraphic control in these sediments. Sedimentation rates interpreted from early magnetostratigraphic studies of cores taken from the T3 ice island in the western Mendeleev Plain were estimated to be on the order of 1 mm/10 3 yr; however, recent amino acid epimerization studies of a core from the same area have suggested sedimentation rates of almost 15 mm/10 3 yr. This controversy has led us to reexamine the paleomagnetism of several of these cores. Our alternating field demagnetization studies indicate that many of these cores have an intense, high coercivity overprint, acquired after the core was opened, that is adequately removed only after treatment at 20 to 70 mT. We have remeasured samples from two cores after demagnetizations up to 80 mT and can confirm the position of the Brunhes/Matuyama boundary originally identified in the cores. In addition, the Jaramillo and Olduvai subchrons are identified. Average sedimentation rates in these two cores are 2–3 mm/10 3 yr, similar to the original estimates based on reversal stratigraphy, as well as those determined from recent radiocarbon studies, but incompatible with the amino acid-based dates. Article in Journal/Newspaper Arctic Arctic Ocean Cambridge University Press Arctic Arctic Ocean Mendeleev Plain ENVELOPE(-178.000,-178.000,80.000,80.000) Quaternary Research 29 1 43 53 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The general lack of an age-diagnostic biostratigraphy in the Neogene sediments of the abyssal Arctic Ocean has emphasized the importance of magnetostratigraphy in providing chronostratigraphic control in these sediments. Sedimentation rates interpreted from early magnetostratigraphic studies of cores taken from the T3 ice island in the western Mendeleev Plain were estimated to be on the order of 1 mm/10 3 yr; however, recent amino acid epimerization studies of a core from the same area have suggested sedimentation rates of almost 15 mm/10 3 yr. This controversy has led us to reexamine the paleomagnetism of several of these cores. Our alternating field demagnetization studies indicate that many of these cores have an intense, high coercivity overprint, acquired after the core was opened, that is adequately removed only after treatment at 20 to 70 mT. We have remeasured samples from two cores after demagnetizations up to 80 mT and can confirm the position of the Brunhes/Matuyama boundary originally identified in the cores. In addition, the Jaramillo and Olduvai subchrons are identified. Average sedimentation rates in these two cores are 2–3 mm/10 3 yr, similar to the original estimates based on reversal stratigraphy, as well as those determined from recent radiocarbon studies, but incompatible with the amino acid-based dates. |
format |
Article in Journal/Newspaper |
author |
Witte, William K. Kent, Dennis V. |
spellingShingle |
Witte, William K. Kent, Dennis V. Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores |
author_facet |
Witte, William K. Kent, Dennis V. |
author_sort |
Witte, William K. |
title |
Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores |
title_short |
Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores |
title_full |
Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores |
title_fullStr |
Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores |
title_full_unstemmed |
Revised Magnetostratigraphies Confirm Low Sedimentation Rates in Arctic Ocean Cores |
title_sort |
revised magnetostratigraphies confirm low sedimentation rates in arctic ocean cores |
publisher |
Cambridge University Press (CUP) |
publishDate |
1988 |
url |
http://dx.doi.org/10.1016/0033-5894(88)90070-1 http://api.elsevier.com/content/article/PII:0033589488900701?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589488900701?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400018706 |
long_lat |
ENVELOPE(-178.000,-178.000,80.000,80.000) |
geographic |
Arctic Arctic Ocean Mendeleev Plain |
geographic_facet |
Arctic Arctic Ocean Mendeleev Plain |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Quaternary Research volume 29, issue 1, page 43-53 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(88)90070-1 |
container_title |
Quaternary Research |
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29 |
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1 |
container_start_page |
43 |
op_container_end_page |
53 |
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1801372672142082048 |