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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Language: | English |
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American Geophysical Union
2007
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/11131/ https://orca.cardiff.ac.uk/id/eprint/11131/1/Barker%202007.pdf https://doi.org/10.1029/2006PA001354 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:11131 2023-06-11T04:16:07+02:00 Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone Barker, Stephen Broecker, W. Clark, E. Hajdas, I. 2007-05 application/pdf https://orca.cardiff.ac.uk/id/eprint/11131/ https://orca.cardiff.ac.uk/id/eprint/11131/1/Barker%202007.pdf https://doi.org/10.1029/2006PA001354 en eng American Geophysical Union https://orca.cardiff.ac.uk/id/eprint/11131/1/Barker%202007.pdf Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Broecker, W., Clark, E. and Hajdas, I. 2007. Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone. Paleoceanography 22 (2) , PA2205. 10.1029/2006PA001354 https://doi.org/10.1029/2006PA001354 file https://orca.cardiff.ac.uk/id/eprint/11131/1/Barker%202007.pdf doi:10.1029/2006PA001354 GC Oceanography QE Geology Article PeerReviewed 2007 ftunivcardiff https://doi.org/10.1029/2006PA001354 2023-05-04T22:33:10Z 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 Cardiff University: ORCA (Online Research @ Cardiff) Paleoceanography 22 2 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
topic |
GC Oceanography QE Geology |
spellingShingle |
GC Oceanography QE Geology Barker, Stephen Broecker, W. Clark, E. Hajdas, I. Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone |
topic_facet |
GC Oceanography QE Geology |
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, W. Clark, E. Hajdas, I. |
author_facet |
Barker, Stephen Broecker, W. Clark, E. Hajdas, I. |
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 |
American Geophysical Union |
publishDate |
2007 |
url |
https://orca.cardiff.ac.uk/id/eprint/11131/ https://orca.cardiff.ac.uk/id/eprint/11131/1/Barker%202007.pdf https://doi.org/10.1029/2006PA001354 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/11131/1/Barker%202007.pdf Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Broecker, W., Clark, E. and Hajdas, I. 2007. Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone. Paleoceanography 22 (2) , PA2205. 10.1029/2006PA001354 https://doi.org/10.1029/2006PA001354 file https://orca.cardiff.ac.uk/id/eprint/11131/1/Barker%202007.pdf doi:10.1029/2006PA001354 |
op_doi |
https://doi.org/10.1029/2006PA001354 |
container_title |
Paleoceanography |
container_volume |
22 |
container_issue |
2 |
_version_ |
1768373557533868032 |