Data/hora: 03/06/2024 07:45:57

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Increased production of cosmogenic 10Be recorded in oceanic sediment sequences: Information on the age, duration, and amplitude of the geomagnetic dipole moment minimum over the Matuyama–Brunhes transition
Autores: | Simon, Quentin; Thouveny, Nicolas; Bourles, Didier L.; Bassinot, Franck; Savranskaia, Tatiana; Valet, Jean-pierre.
Data: | 2018-05
Ano: | 2018
Palavras-chave: | Authigenic Be-10/Be-9 ratio; Geomagnetic dipole moment minimum; Matuyama-Brunhes transition (MBT); Geomagnetic polarity reversal; Marine isotope stage 19; Atmospheric Be-10 production rates.
Resumo: | New high-resolution authigenic 10Be/9Be ratio (Be-ratio) records covering the last geomagnetic reversal, i.e. the Matuyama–Brunhes transition (MBT), have been obtained and set on a time scale using benthic δ18 O (Cibicides wuellerstorfi) records. The geographic distribution of the four studied sites allows global comparison between the North Atlantic, Indian and Pacific Oceans. All Be-ratio records contain a two-fold increase triggered by the geomagnetic dipole moment (GDM) collapse associated with the MBT. The stratigraphic position of the Be-ratio spike, relative to marine isotope stages, allows establishment of a robust astrochronological framework for the MBT, anchoring its age between 778 and 766 ka (average mid-peaks at 772 ka), which is consistent with all other available 10Be-proxy records from marine, ice and loess archives. The global 10Be atmospheric production doubling represents an increase of more than 300 atoms m−2 s−1 that is compatible with the increased magnitude of atmospheric 10Be production obtained by simulations between the present GDM and a null-GDM. The minimum 10Be-derived GDM average computed for the 776–771 ka interval is 1.7±0.4×10 22 Am2, in agreement with model simulations and absolute paleointensities of transitional lava flows.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00430/54150/55510.pdf

https://archimer.ifremer.fr/doc/00430/54150/55511.xlsx

https://archimer.ifremer.fr/doc/00430/54150/55512.xlsx

https://archimer.ifremer.fr/doc/00430/54150/55513.xlsx

https://archimer.ifremer.fr/doc/00430/54150/55514.xlsx

https://archimer.ifremer.fr/doc/00430/54150/55515.xlsx

DOI:10.1016/j.epsl.2018.02.036

https://archimer.ifremer.fr/doc/00430/54150/

Editor: | Elsevier Science Bv
Relação: | info:eu-repo/grantAgreement/EC/FP7/339899/EU//EDIFICE
Formato: | application/pdf
Fonte: | Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2018-05 , Vol. 489 , P. 191-202

Fonte:

2018 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license

info:eu-repo/semantics/openAccess

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