Strong kinetic effects on Sr/Ca ratios in the calcitic bivalve Pecten maximus

被引：118

作者：

Lorrain, A ^{[1
]}

Gillikin, DP

Paulet, YM

Chauvaud, L

Le Mercier, A

Navez, J

André, L

机构：

[1] Royal Museum Cent Africa, Sect Petrog Mineral Geochem, B-3080 Tervuren, Belgium

[2] Free Univ Brussels, Dept Analyt & Environm Chem, B-1050 Brussels, Belgium

[3] European Univ Inst, CNRS, UMR 6539, LEMAR, F-29280 Plouzane, France

来源：

GEOLOGY | 2005年 / 33卷 / 12期

关键词：

mollusc; calcite; strontium; magnesium; daily growth; temperature proxy;

D O I：

10.1130/G22048.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

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.

引用

页码：965 / 968

页数：4

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