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Science 15 September 1978:
Vol. 201. no. 4360, pp. 1016 - 1017
DOI: 10.1126/science.201.4360.1016
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Articles

Oceanic Residence Times of Dissolved Beryllium and Aluminum Deduced from Cosmogenic Tracers 10Be and 26Al

YUJI YOKOYAMA 1, FRANÇOIS GUICHARD 1, JEAN-LOUIS REYSS 1, and NGUYEN HUU VAN 1

1 Centre des Faibles Radioactivités, Laboratoire mixte du Centre National de la Recherche Scientifique et du Commissariat à l'Energie Atomique, 91190 Gif sur Yvette, France

The residence times of the soluble fractions of beryllium and aluminum in seawater are estimated to be 1500 years or more. These residence times are estimated from a comparison of the annual deposition rates of cosmogenic beryllium-10 and aluminum-26 with the concentrations of beryllium-10 and aluminum-26 in seawater estimated from the specific activities of these radionuclides in an authigenic mineral assembly such as a manganese nodule. These residence times are greater by an order of magnitude than the mean residence times of beryllium and aluminum estimated from the geochemical balance.

Submitted on January 31, 1978
Revised on May 17, 1978


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Cosmogenic nuclide dating of Sahelanthropus tchadensis and Australopithecus bahrelghazali: Mio-Pliocene hominids from Chad.
A.-E. Lebatard, D. L. Bourles, P. Duringer, M. Jolivet, R. Braucher, J. Carcaillet, M. Schuster, N. Arnaud, P. Monie, F. Lihoreau, et al. (2008)
PNAS 105, 3226-3231
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Science. ISSN 0036-8075 (print), 1095-9203 (online)