Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments
We studied four marine sediment records of the Matuyama–Brunhes geomagnetic reversal from four sites located in the Indian, Atlantic and western Pacific oceans. The results combine paleomagnetic, cosmogenic nuclide beryllium (10Be) and oxygen isotope analyses that were performed on the same samples...
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Online Access: | https://archimer.ifremer.fr/doc/00469/58063/60459.pdf https://doi.org/10.1016/j.epsl.2018.11.012 https://archimer.ifremer.fr/doc/00469/58063/ |
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ftarchimer:oai:archimer.ifremer.fr:58063 2023-05-15T17:34:53+02:00 Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments Valet, Jean-pierre Bassinot, Franck Simon, Quentin Savranskaia, Tatiana Thouveny, Nicolas Bourlés, Didier L. Villedieu, Anouk 2019-01 application/pdf https://archimer.ifremer.fr/doc/00469/58063/60459.pdf https://doi.org/10.1016/j.epsl.2018.11.012 https://archimer.ifremer.fr/doc/00469/58063/ eng eng Elsevier BV info:eu-repo/grantAgreement/EC/FP7/339899/EU//EDIFICE https://archimer.ifremer.fr/doc/00469/58063/60459.pdf doi:10.1016/j.epsl.2018.11.012 https://archimer.ifremer.fr/doc/00469/58063/ info:eu-repo/semantics/openAccess restricted use Earth And Planetary Science Letters (0012-821X) (Elsevier BV), 2019-01 , Vol. 506 , P. 323-331 magnetic reversal Brunhes-Matuyama Be-ratio field intensity stratigraphy text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1016/j.epsl.2018.11.012 2021-09-23T20:31:51Z We studied four marine sediment records of the Matuyama–Brunhes geomagnetic reversal from four sites located in the Indian, Atlantic and western Pacific oceans. The results combine paleomagnetic, cosmogenic nuclide beryllium (10Be) and oxygen isotope analyses that were performed on the same samples in order to avoid any stratigraphic bias. The three records from the equatorial Indian Ocean and North Atlantic Ocean did not reveal any offset between the authigenic 10Be/9Be ratio (Be-ratio) peak and the interval of low relative paleointensity (RPI) that characterizes the reversal. The lower and upper limits of transitional directions are also concomitant with the increased atmospheric 10Be production that accompanied the geomagnetic dipole intensity decrease. In contrast, the record from western equatorial Pacific Ocean sediments was found 18 cm below the Be-ratio changes as a result of late magnetization acquisition. At all four sites, maximum 10Be production occurred at the same period soon after the maximum of Marine Isotope Stage 19 (MIS 19) and, therefore, indicates its synchronous worldwide character. Such features are effectively observed from the Be-ratio signals and their relationship with the magnetic transition interval, which further confirms the synchronous character of the transition. Taking all dating uncertainties (1.6 ka between sites and 5 ka for the age model) into consideration, our records suggest a mean reversal age of 772.4 ± 6.6 ka. The age of the transition in the Atlantic Ocean record is closer to 774 ka but this difference is within the limit of significance. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Pacific Earth and Planetary Science Letters 506 323 331 |
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 |
magnetic reversal Brunhes-Matuyama Be-ratio field intensity stratigraphy |
spellingShingle |
magnetic reversal Brunhes-Matuyama Be-ratio field intensity stratigraphy Valet, Jean-pierre Bassinot, Franck Simon, Quentin Savranskaia, Tatiana Thouveny, Nicolas Bourlés, Didier L. Villedieu, Anouk Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments |
topic_facet |
magnetic reversal Brunhes-Matuyama Be-ratio field intensity stratigraphy |
description |
We studied four marine sediment records of the Matuyama–Brunhes geomagnetic reversal from four sites located in the Indian, Atlantic and western Pacific oceans. The results combine paleomagnetic, cosmogenic nuclide beryllium (10Be) and oxygen isotope analyses that were performed on the same samples in order to avoid any stratigraphic bias. The three records from the equatorial Indian Ocean and North Atlantic Ocean did not reveal any offset between the authigenic 10Be/9Be ratio (Be-ratio) peak and the interval of low relative paleointensity (RPI) that characterizes the reversal. The lower and upper limits of transitional directions are also concomitant with the increased atmospheric 10Be production that accompanied the geomagnetic dipole intensity decrease. In contrast, the record from western equatorial Pacific Ocean sediments was found 18 cm below the Be-ratio changes as a result of late magnetization acquisition. At all four sites, maximum 10Be production occurred at the same period soon after the maximum of Marine Isotope Stage 19 (MIS 19) and, therefore, indicates its synchronous worldwide character. Such features are effectively observed from the Be-ratio signals and their relationship with the magnetic transition interval, which further confirms the synchronous character of the transition. Taking all dating uncertainties (1.6 ka between sites and 5 ka for the age model) into consideration, our records suggest a mean reversal age of 772.4 ± 6.6 ka. The age of the transition in the Atlantic Ocean record is closer to 774 ka but this difference is within the limit of significance. |
format |
Article in Journal/Newspaper |
author |
Valet, Jean-pierre Bassinot, Franck Simon, Quentin Savranskaia, Tatiana Thouveny, Nicolas Bourlés, Didier L. Villedieu, Anouk |
author_facet |
Valet, Jean-pierre Bassinot, Franck Simon, Quentin Savranskaia, Tatiana Thouveny, Nicolas Bourlés, Didier L. Villedieu, Anouk |
author_sort |
Valet, Jean-pierre |
title |
Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments |
title_short |
Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments |
title_full |
Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments |
title_fullStr |
Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments |
title_full_unstemmed |
Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments |
title_sort |
constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of atlantic, indian, and pacific ocean sediments |
publisher |
Elsevier BV |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00469/58063/60459.pdf https://doi.org/10.1016/j.epsl.2018.11.012 https://archimer.ifremer.fr/doc/00469/58063/ |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Earth And Planetary Science Letters (0012-821X) (Elsevier BV), 2019-01 , Vol. 506 , P. 323-331 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/339899/EU//EDIFICE https://archimer.ifremer.fr/doc/00469/58063/60459.pdf doi:10.1016/j.epsl.2018.11.012 https://archimer.ifremer.fr/doc/00469/58063/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.epsl.2018.11.012 |
container_title |
Earth and Planetary Science Letters |
container_volume |
506 |
container_start_page |
323 |
op_container_end_page |
331 |
_version_ |
1766133854780784640 |