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Carcaillet, Julien; Bourlès, Didier L; Thouveny, Nicolas; Arnold, Maurice (2004): Beryllium isotopes of sediments from the Portuguese margin. PANGAEA,, Supplement to: Carcaillet, J et al. (2004): A high resolution authigenic 10Be/9Be record of geomagnetic moment variations over the last 300 ka from sedimentary cores of the Portuguese margin. Earth and Planetary Science Letters, 219(3-4), 397-412,

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A high resolution study of authigenic Be isotopes (10Be and 9Be) combined with continuous relative paleointensity records has been performed along the same marine sedimentary sequences from the Portuguese margin (NE Atlantic) covering the past 300 kyr in order to assess relationships between geomagnetic moment variations and 10Be production rate variations. A careful examination of the various ways of taking into account environmental disturbing effects on the authigenic 10Be concentration leads to the conclusion that the most reliable proxy of cosmonuclide production rates is presently the authigenic 10Be/9Be ratio. Eight intervals of significant authigenic 10Be/9Be enhancement evidence geomagnetic moment drops related to global paleomagnetic excursions, some being already admitted, others being proposed as new geomagnetic features. Since, unlike sedimentary magnetic remanence, the authigenic 10Be/9Be records dipole moment variations without significant acquisition delay, it provides better constraints on their timing. Comparison of 10Be/9Be and benthic delta18O records from the same cores suggests that dipole moment lows preferentially occurred during or at the end of interglacial episodes, with a quasi-period of 100 kyr.
Median Latitude: 39.190833 * Median Longitude: -10.013833 * South-bound Latitude: 37.799833 * West-bound Longitude: -10.166500 * North-bound Latitude: 40.581833 * East-bound Longitude: -9.861167
Date/Time Start: 1995-07-07T00:00:00 * Date/Time End: 1995-07-09T00:00:00
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
MD95-2042 (MD952042) * Latitude: 37.799833 * Longitude: -10.166500 * Date/Time: 1995-07-09T00:00:00 * Elevation: -3146.0 m * Recovery: 40 m * Location: Marge Ibérique * Campaign: MD101 (IMAGES I) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO) * Comment: XXVII Sections, OK; core bent
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