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1 Section of Petrography-Mineralogy-Geochemistry, Royal Museum for Central Africa, 3080 Tervuren, Belgium
2 Department of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, 1050 Brussels, Belgium
3 Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR 6539 CNRS, Institut Universitaire Européen de la Mer, 29 280 Plouzané, France
4 Section of Petrography-Mineralogy-Geochemistry, Royal Museum for Central Africa, 3080 Tervuren, Belgium
Although Sr/Ca ratios in abiogenic calcite are strongly controlled by precipitation rates, such a kinetic effect has never been demonstrated in calcitic bivalve shells. Therefore, we report Sr/Ca ratios together with daily growth rates in the calcitic shells of four individuals of the bivalve Pecten maximus (age class I). Ratios of Sr/Ca were found to be variable among individuals that grew at the same location, illustrating that vital effects dominate over environmental controls. Although daily growth rate was correlated with shell Sr/Ca ratios, it explained only half of the Sr/Ca variations. However, daily shell surface area increment, an estimation of the total quantity of carbonate precipitated for a given time, explained 74% of the Sr/Ca variability in the shells of P. maximus. This proves, for the first time in a calcitic bivalve, that shell Sr/Ca partitioning is mainly controlled by kinetic effects. The Sr/Ca ratio should therefore be tested as a potential proxy of calcification rate in modern or fossil calcitic biocarbonates.
Key Words: mollusc • calcite • strontium • magnesium • daily growth • temperature proxy
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