Use of in situ-produced 10Be in carbonate-rich environments: A first attempt

R. Braucher, L. Benedetti, D. L. Bourlès, E. T. Brown, D. Chardon

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15 Scopus citations

Abstract

We have determined the production rate of in situ-produced 10Be in calcite through measurements of 10Be and 36Cl concentrations in the same calcite samples and of 10Be concentrations in depth profiles of flint from the same erosional surface. This yields a 10Be production rate in calcite of 37.9 ± 6.0 at/g/yr at sea level and high latitude, approximately sixfold higher than production in the coexisting flint. We propose that this higher rate of production may be due to high production cross sections for C spallation by cosmic rays with energies below 50 MeV. These results also open the possibility of dating burial events in carbonate-rich environments by differential radioactive decay of 10Be and 36Cl.

Original languageEnglish (US)
Pages (from-to)1473-1478
Number of pages6
JournalGeochimica et Cosmochimica Acta
Volume69
Issue number6
DOIs
StatePublished - Mar 15 2005

Bibliographical note

Funding Information:
The authors thank the referees for their constructive reviews that significantly improved the manuscript. Special thanks to D. Hermitte and M. Dubard for their help during sampling. R.B. appreciates fruitful discussions with G. Raisbeck. We thoroughly acknowledge R. Finkel for 36 Cl AMS measurements and G. Aumaître for his indispensable assistance with 10 Be AMS measurements. This work was partly supported by CNRS-ACI “Prévention des Catastrophes Naturelles” and the E.U. S.A.F.E. project (EVG1-2000-22005).

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