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Variability in the partition coefficients for Mg and Sr in the shells of the ostracod >Heterocypris salina> from culture experiments,

AuthorsSayyad, I.; Anadón, Pere CSIC ORCID; Martín-Rubio, M.; Robles, F.; Rodríguez-Lázaro, Julio; Utrilla, Rosa CSIC ; Vázquez, Antonio CSIC
Issue Date19-Apr-2009
CitationGeophysical Research Abstracts, 11: EGU2009-10449 (2009)
AbstractThe partition coefficients of trace elements in ostracod shells (KdMe = Me/Ca valve/ Me/Ca water , in molar ratios), mainly for Mg and Sr, have been widely used for the reconstruction of paleoenvironments. In order to settle these coefficients for Heterocypris salina , juvenile individuals of this ostracod species were grown up to the adult stage in culture experiments in 5 waters with a wide range of hydrochemistry (Mg/Ca wrange from 0.5 to 12, Sr/Ca wrange from 0.005 to 0.02), conductivity (1-17 mS/cm) and at 4 constant temperatures (18, 20, 25, 28ºC). From our experiments, Mg/Ca and Sr/Ca molar ratios of the valve calcite are directly related to the Mg/Ca and Sr/Ca of the water respectively, and to the temperature of the water (Tw) . In the case of Mg/Ca the temperature change has equal effect in the whole studied range of Mg/Ca w whereas for the Sr/Ca the temperature effect is greater at high Sr/Ca w . Moreover, Mg/Ca in the valve calcite has a good correlation to the [Mg] in water. KdMg displays very high and diverse values (0.004-0.016) at low Mg/Ca w(<2). At high Mg/Ca w, KdMg displays small variations,and its dispersion can be explained by the Tw: the higher the Tw, the higher the value of the coefficient for a givenMg/Caw. Neither the conductivity nor the [Ca] in water appear to have a clear effect on the KdMg. KdSr values are nearly constant, but they increase slightly with the Sr/Ca w and with the T w. Other water parameters such as conductivity, [Sr], [Ca], or Mg/Ca w, do not seem to have effect on the KdSr.
Appears in Collections:(Geo3Bcn) Comunicaciones congresos
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