M. Boiseau et al., SR CA AND DELTA-O-18 RATIOS MEASURED FROM ACROPORA-NOBILIS AND PORITES LUTEA - IS SR/CA PALEOTHERMOMETRY ALWAYS RELIABLE/, Comptes rendus de l'Academie des sciences. Serie II. Sciences de la terre et des planetes, 325(10), 1997, pp. 747-752
We measured the Sr/Ca and O-18/O-16 ratios in Acropora nobilis and Por
ites lutea, from the Mayotte lagoon. As the variations of delta(18)O(s
eawater) are negligible, coral delta(18)O(aragonite) reflects only sea
sonal temperature variations. While there is a good agreement between
the Sr/Ca ratio and delta(18)O for Acropora nobilis, it is not the cas
e for Porites lutea. Coral biological and environmental parameters can
not explain the discrepancies between Sr/Ca ratios and isotopic measur
ements. However, transport mechanisms of Sr2+ and Ca2+ and the presenc
e of two mineralogical structures of strontium may affect the Sr/Ca ra
tio.