FN Archimer Export Format
PT J
TI Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments
BT 
AF Valet, Jean-Pierre
   Bassinot, Franck
   Simon, Quentin
   Savranskaia, Tatiana
   Thouveny, Nicolas
   Bourlés, Didier L.
   Villedieu, Anouk
AS 1:1;2:2;3:3;4:1;5:2;6:2;7:2;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Institut de Physique du Globe de Paris, Université Paris Diderot, Sorbonne Paris-Cité, UMR 7154 CNRS, 1 rue Jussieu, 75238 Paris Cedex 05, France
   Laboratoire des Sciences du Climat et de l'Environnement (CEA-CNRS-UVSQ), Domaine du CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
   CEREGE UM34, Aix Marseille Univ., CNRS, IRD, INRA, Coll France, Aix-en-Provence, France
C2 IPGP, FRANCE
   LSCE, FRANCE
   CEREGE, FRANCE
IF 4.823
TC 28
UR https://archimer.ifremer.fr/doc/00469/58063/60459.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES 4-MD111
   SEYMAMA - MD 65
BO Marion Dufresne
DE ;magnetic reversal;Brunhes-Matuyama;Be-ratio;field intensity;stratigraphy
AB 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. 
PY 2019
PD JAN
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier BV
VL 506
UT 000455693800030
BP 323
EP 331
DI 10.1016/j.epsl.2018.11.012
ID 58063
ER

EF