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Distribution of elements Mg, Sr y Na in the oyster Crassostrea gigas at Santona salt marshes, Cantabria seasonal, microstructural and ontogenetic monitoring Distribucion de elementos Mg, Sr y Na en la ostra Crassostrea gigas de las Marismas de Santona, Cantabria control estacional, microestructural y ontogenetico


, : Distribution of elements Mg, Sr y Na in the oyster Crassostrea gigas at Santona salt marshes, Cantabria seasonal, microstructural and ontogenetic monitoring Distribucion de elementos Mg, Sr y Na en la ostra Crassostrea gigas de las Marismas de Santona, Cantabria control estacional, microestructural y ontogenetico. Revista de la Sociedad Geologica de Espana. Junio; 191-2: 27-42

The realization of sclerochronological and geochemical studies, using electron microprobe on polished sections, in the the umbo of the right valve of Crassostrea gigas shells living in the Salt marshes of Santona, has allowed to determine that the main controls on the concentration of Mg, Sr y Na are: seasonality, microstructure and ontogeny. The presence of a rhythm of clear and dark zones and the existence of 130 to 175 growth lines in each dark zone and the sinusoidal model that show the molar ratios Mg/Ca and Sr/Ca correlated with the presence of dark and bright zones, indicate successive warmer periods (spring-summer), as dark zones, and colder ones (autumn-winter), as clear zones. This methodology has application in the study of environmental and paleoenvironmental problems. An ontogenetic control on the distribution of Na also exists, so that it decreases throughout the life of oyster. The two principal microstructures in valves, Regular Foliated (RF) and Complex Cross Foliated (CCF), in the chalk, both composed by low-magnesium calcite, exert a microstructural control on the content of Mg, Sr y Na. So that the RF is slightly more concentrated in Sr, and the chalk in Mg and Na. It is also observable a greater dispersion of data in the analyses of chalk, which reveals a greater chemical heterogeneity, probably related with the high rate of growth of the chalk.

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