Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone
Shells of coexisting species of planktonic foraminifera from the Ontong Java Plateau reveal radiocarbon age offsets of up to 2200 years. Similar offsets are found between fragments and whole shells of single species. Steady state modelling of dissolution and bioturbation within the sedimentary mixed...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Amer Geophysical Union
2007
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Online Access: | https://archimer.ifremer.fr/doc/00238/34943/33247.pdf https://doi.org/10.1029/2006PA001354 https://archimer.ifremer.fr/doc/00238/34943/ |
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ftarchimer:oai:archimer.ifremer.fr:34943 2023-05-15T18:00:51+02:00 Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone Barker, Stephen Broecker, Wallace Clark, Elizabeth Hajdas, Irka 2007-05 application/pdf https://archimer.ifremer.fr/doc/00238/34943/33247.pdf https://doi.org/10.1029/2006PA001354 https://archimer.ifremer.fr/doc/00238/34943/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00238/34943/33247.pdf doi:10.1029/2006PA001354 https://archimer.ifremer.fr/doc/00238/34943/ Copyright 2007 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2007-05 , Vol. 22 , N. 2/PA2205 , P. 1-11 adiocarbon dating dissolution fragmentation text Publication info:eu-repo/semantics/article 2007 ftarchimer https://doi.org/10.1029/2006PA001354 2021-09-23T20:25:26Z Shells of coexisting species of planktonic foraminifera from the Ontong Java Plateau reveal radiocarbon age offsets of up to 2200 years. Similar offsets are found between fragments and whole shells of single species. Steady state modelling of dissolution and bioturbation within the sedimentary mixed layer predicts age differences of up to several kiloyears due to the interplay between differential dissolution and fragmentation of foraminifer shells and bioturbation. The observation that fragile foraminiferal shells are systematically older than those of more robust species is more difficult to explain. Mechanisms of chemical erosion, interface dissolution, and sediment redistribution are all apparently unable to explain this phenomenon. A possible solution is presented in which a particular species may be represented by two distinct classes of shells which are more or less robust. In this case, differential dissolution and fragmentation causes an increase in the mean age as the fragile class contributes less to the remaining intact shells. This study highlights the vulnerability of low sedimentation rate cores to the effects of dissolution and bioturbation. Article in Journal/Newspaper Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Paleoceanography 22 2 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
adiocarbon dating dissolution fragmentation |
spellingShingle |
adiocarbon dating dissolution fragmentation Barker, Stephen Broecker, Wallace Clark, Elizabeth Hajdas, Irka Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
topic_facet |
adiocarbon dating dissolution fragmentation |
description |
Shells of coexisting species of planktonic foraminifera from the Ontong Java Plateau reveal radiocarbon age offsets of up to 2200 years. Similar offsets are found between fragments and whole shells of single species. Steady state modelling of dissolution and bioturbation within the sedimentary mixed layer predicts age differences of up to several kiloyears due to the interplay between differential dissolution and fragmentation of foraminifer shells and bioturbation. The observation that fragile foraminiferal shells are systematically older than those of more robust species is more difficult to explain. Mechanisms of chemical erosion, interface dissolution, and sediment redistribution are all apparently unable to explain this phenomenon. A possible solution is presented in which a particular species may be represented by two distinct classes of shells which are more or less robust. In this case, differential dissolution and fragmentation causes an increase in the mean age as the fragile class contributes less to the remaining intact shells. This study highlights the vulnerability of low sedimentation rate cores to the effects of dissolution and bioturbation. |
format |
Article in Journal/Newspaper |
author |
Barker, Stephen Broecker, Wallace Clark, Elizabeth Hajdas, Irka |
author_facet |
Barker, Stephen Broecker, Wallace Clark, Elizabeth Hajdas, Irka |
author_sort |
Barker, Stephen |
title |
Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
title_short |
Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
title_full |
Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
title_fullStr |
Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
title_full_unstemmed |
Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
title_sort |
radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
publisher |
Amer Geophysical Union |
publishDate |
2007 |
url |
https://archimer.ifremer.fr/doc/00238/34943/33247.pdf https://doi.org/10.1029/2006PA001354 https://archimer.ifremer.fr/doc/00238/34943/ |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2007-05 , Vol. 22 , N. 2/PA2205 , P. 1-11 |
op_relation |
https://archimer.ifremer.fr/doc/00238/34943/33247.pdf doi:10.1029/2006PA001354 https://archimer.ifremer.fr/doc/00238/34943/ |
op_rights |
Copyright 2007 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2006PA001354 |
container_title |
Paleoceanography |
container_volume |
22 |
container_issue |
2 |
_version_ |
1766170124525502464 |