Physics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..707c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 6, p. 707-710
Physics
28
Beryllium Isotopes, Geochronology, Mediterranean Sea, Sediments, Argon Isotopes, Boreholes, Carbon 14, Deposition, Ice, Volcanoes
Scientific paper
In this letter, we report the profiles (approx. 160 samples) of Be-10, Be-9, Zn in a Mediterranean sediment core spanning the last 60 kyr. We show that existence of a Be-10 peak, whose absolute age is estimated to be 34 +/- 3 kyr BP, based on its stratigraphic position between two tephra layers originating from two volcanic eruptions (Campanian Ignimbrite and Citara), dated by K-Ar, Ar-40-Ar-39 and C-14 methods. This peak is similar to the increase in the Be-10 concentration observed in Vostok and Dome C ice cores at the same age. The increase with approximately similar amplitude in both ice and sediment cores at different latitudes and hemispheres cannot be explained by changes in the archives. The present result supports the view of a well defined global enhancement of the Be-10 flux, related to an increase of the Be-10 production rate and not to a redistribution of the Be-10 fallout between different latitudes.
Albrecht Andreas
Beer Joseph
Bonino Gianfranco
Callegari E.
Castagnoli Cini G.
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