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	Provedor de dados 5 (2) Autor Bourles, Dl (2) Carcaillet, Jt (2) Thouveny, N (2) Palavra-chave Geomagnetic moment (2) Paleointensity (2) Authigenic (10)Be/(9)Be (1) Beryllium (1) Cosmogenic isotope production (1) Cosmogenic nuclide production rate (1) Geomagnetic excursions and reversals (1) Marine sedimentary archives (1) Mais... Tipo do documento Text (2) Ano 2004 (1) 2003 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Geomagnetic moment instability between 0.6 and 1.3 Ma from cosmonuclide evidence 5 Carcaillet, Jt; Thouveny, N; Bourles, Dl. The reliability of paleomagnetic records as proxies of the geomagnetic field intensity is still a matter of controversy since volcanic materials hardly provide continuous records, and marine sediments are suspected to carry a remanence biased by post-depositional realignments and/or by overprints. Such long standing debate emphasizes the need for the development of methods independent from paleomagnetism to decipher geomagnetic intensity variations. High resolution measurements of authigenic (10)Be/(9)Be along with a detailed sedimentary record of directional and relative paleointensity variations evidence, over the 0.6-1.3 Ma time interval, frequent and recurrent excursions or short events in the late Matuyama and the early Brunhes epochs, among which two... Tipo: Text Palavras-chave: Geomagnetic excursions and reversals; Paleointensity; Geomagnetic moment; Authigenic (10)Be/(9)Be; Cosmogenic isotope production; Marine sedimentary archives. Ano: 2003 URL: https://archimer.ifremer.fr/doc/00226/33708/32123.pdf Geomagnetic dipole moment and Be-10 production rate intercalibration from authigenic Be-10/(9) Be for the last 1.3 Ma 5 Carcaillet, Jt; Bourles, Dl; Thouveny, N. A synthesis of authigenic Be-10/Be-9 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 (1) relative paleointensity records obtained from the same sediments, (2) a seafloor magnetization record derived form magnetic anomalies, and (3) an absolute Virtual Dipole Moment (VDM) record constructed from an updated database of absolute paleointensities. The authigenic Be-10/Be-9 ratio records document the occurrence of the paleomagnetic events (excursions and reversals) reported for these time intervals by... Tipo: Text Palavras-chave: Cosmogenic nuclide production rate; Beryllium; Paleointensity; Geomagnetic moment. Ano: 2004 URL: https://archimer.ifremer.fr/doc/00229/34014/32371.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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