Geomagnetic dipole moment and 10Be production rate intercalibration from authigenic 10Be/9Be for the last 1,3 Ma.

• Published in: Geochemistry, Geophysics, Geosystems
• Main Authors: Carcaillet, Julien, Bourlès, Didier, Thouveny, Nicolas
• Other Authors: Laboratoire de Géodynamique des Chaines Alpines (LGCA), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2004
• Subjects: [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry; North East Atlantic
• Online Access: https://hal.science/hal-00097425; https://hal.science/hal-00097425/document; https://hal.science/hal-00097425/file/Carcaillet_G3.pdf; https://doi.org/10.1029/2003GC000641

A synthesis of authigenic 10Be/9Be ratio records constructed from sedimentary sequences deposited over the last 300 ka in the North East Atlantic and over the 500-1300 ka BP interval in the West Equatorial Pacific Ocean is compared with proxies of the geomagnetic moment variations over the same time intervals. These proxies consist in : i) relative paleointensity records obtained from the same sediments; ii) a sea floor magnetization record derived from magnetic anomalies; iii) an absolute Virtual Dipole Moment (VDM) record constructed from an updated database of absolute paleointensities. The authigenic 10Be/9Be ratio records document the occurrence of the paleomagnetic events (excursions and reversals) reported for these time intervals by paleomagnetic studies. Reconstructions of 10Be/9Be derived magnetic moment records based on theoretical and empirical relationships between 10Be/9Be ratio and absolute VDM allow establishing 10Be derived VDM records that exhibit the same overall structures as the geomagnetic proxy records.