Absolute paleointensities recorded during the Brunhes chron at La Guadeloupe Island

Details Absolute paleointensities recorded during the Brunhes chron at La Guadeloupe Island Absolute paleointensities recorded during the Brunhes chron at La Guadeloupe Island

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..120..255c&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 120, Issue 4, p. 255-269.

Physics

9

Scientific paper

Ten absolute paleointensity determinations within the Brunhes chron have been obtained on andesitic lava flows from La Guadeloupe Island, French West Indies (F.W.I.). The Thellier and Thellier method performed on 124 specimens under either ambient or argon atmosphere allows reliable determinations from high temperature steps. A satisfactory within flow reproducibility has been observed and at least two samples for each flow have been used for calculation of the weighted-mean paleointensity. The average virtual axial dipole moment (VADM=7.1+/-1.8×1022 A m2) for normal polarity flows from the Brunhes chron recorded at La Guadeloupe is compatible with the historical field. The 10 VADM values obtained show a relatively good agreement with the deep-sea composite record (SINT800) of relative paleointensity. Focusing on the 100-75 ka interval, a 20-ka oscillation observed from a compilation of available volcanic data and present in high-resolution sedimentary records has been tentatively related to the axial dipole moment variations. Finally, a paleointensity decrease of a factor of 10 is observed for flows emitted during the Matuyama-Brunhes (M-B) transition, as already observed in other records of this reversal. Because a large area of the Globe around the Caribbean Islands was previously devoid of data, the present dataset fills a gap towards construction of a global paleointensity database for the Brunhes chron.

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