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Constraining the age of the last geomagnetic reversal from geochemical and magnetic analyses of Atlantic, Indian, and Pacific Ocean sediments 5
Valet, Jean-pierre; Bassinot, Franck; Simon, Quentin; Savranskaia, Tatiana; Thouveny, Nicolas; Bourlés, Didier L.; Villedieu, Anouk.
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....
Tipo: Text Palavras-chave: Magnetic reversal; Brunhes-Matuyama; Be-ratio; Field intensity; Stratigraphy.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00469/58063/60459.pdf
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Rapport d'activités 2019 du Laboratoire Environnement Ressources du Morbihan Pays de Loire 5
Cochennec-laureau, Nathalie; Bizzozero, Lucie; Bonneau, Francoise; Bouget, Jean-francois; Bouvier, Calypso; Collin, Karine; Fortune, Mireille; Gabellec, Raoul; Le Merrer, Yoann; Manach, Soazig; Pierre-duplessix, Olivier; Retho, Michael; Roux, Pauline; Schapira, Mathilde; Schmitt, Anne; Souchu, Philippe; Stanisiere, Jean-yves; Villedieu, Anouk.
Activités d’observation, de surveillance de la qualité des eaux littorales du Morbihan, Pays de la Loire et Nord Vendée et résultats des projets de recherche 2019
Tipo: Text Palavras-chave: Réseaux de surveillance et d’observation; Qualité des écosystèmes marins littoraux du Morbihan; Pays de la Loire; Microbiologie; Phytoplancton; Eutrophisation; Ressources exploitées; Huîtres; Moules.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00630/74217/73849.pdf
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