The sedimentary geochemistry of the beryllium isotopes

Physics

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Scientific paper

The sedimentary geochemistry of beryllium has been investigated with a view toward the use of cosmic-ray-produced Be 10 for geochronology. Analyses of some Pacific ocean water samples give an average total Be content of 6 × 10 -13 parts per part (p.p.p.), less than half of which is retained by a Millipore filter. The concentration of Be 9 in five deep ocean sediment cores ranges from 2 to 3 p.p.m. These data indicate an ocean residence time for Be of the order of a few hundred years. Analyses of river water give concentrations of about 10 -10 p.p.p., substantiating this residence time. An abrupt change in Be -10 content with depth in a Pacific sediment core correlates with a change in the ioniumthorium ratio reported by Goldberg and Koide for the same core.

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