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Carcaillet, Julien; Thouveny, Nicolas; Bourlès, Didier L (2003): Paleomagnetic and beryllium isotope record of West Equatorial Pacific sediments. PANGAEA,, Supplement to: Carcaillet, J et al. (2003): Geomagnetic moment instability between 0.6 and 1.3 Ma from cosmonuclide evidence. Geophysical Research Letters, 30(15), 1792,

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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 10Be/9Be 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 Brunhes-Matuyama reversal precursors and an intra-Jaramillo excursion. The results of this study confirm the idea of a highly unstable geomagnetic field as suggested by paleomagnetic evidences.
Median Latitude: 14.889278 * Median Longitude: 91.218278 * South-bound Latitude: 2.043000 * West-bound Longitude: -9.861167 * North-bound Latitude: 40.581833 * East-bound Longitude: 141.758000
Date/Time Start: 1995-07-07T00:00:00 * Date/Time End: 1995-07-07T00:00:00
MD95-2040 (MD952040) * Latitude: 40.581833 * Longitude: -9.861167 * Date/Time: 1995-07-07T00:00:00 * Elevation: -2465.0 m * Recovery: 35 m * Location: Porto Seamount * Campaign: MD101 (IMAGES I) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO) * Comment: XXIV Sections, core bent; section IIb jamed in the bent part of the core, recuperated in 1/2 liner
MD97-2140 (MD972140) * Latitude: 2.043000 * Longitude: 141.758000 * Recovery: 37.41 m * Campaign: MD106 (IMAGES III - IPHIS) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO)
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