Oxygen isotope variability in calcite shells of the ostracod Cyprideis torosa in Akyatan Lagoon, Turkey

Anne-Marie Bodergat; Christophe Lécuyer; Fran?ois MartineauAtike NazikKemal GürbüzSerge Legendre

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Oxygen isotope variability in calcite shells of the ostracod Cyprideis torosa in Akyatan Lagoon, Turkey

机译：Oxygen isotope variability in calcite shells of the ostracod Cyprideis torosa in Akyatan Lagoon, Turkey

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The euryhaline ostracod Cyprideis torosa lives in Akyatan Lagoon, Turkey, which is exposed to large spatial and seasonal variations in water salinity, δ~(18)O, and temperature. Hydrogen and oxygen isotope measurements of waters reveal that the large range of salinity (15–80 g L~(-1)) in the lagoon results from a combination of evaporation and mixing between Mediterranean seawater and Seyhan River input. Round sieve-pore relative abundance in C. torosa provides a robust proxy for water salinity (S) from 15 to 80 g L~(-1), according to the equation: S = 161.41 (±4.52) * log_(10)( rounded pores) - 94.04 (±3.44) (R~2 = 0.937; p = 10~(-31)). Seasonal sampling and isotope analysis of C. torosa in waters of known δ~(18)O values (-4.7 to + 6.9 ‰ V-PDB) and temperatures (15–35 ℃) yielded a weak positive correlation (r = 0.71) between 1000 ln_(α(calcite–water)) ‰ V-SMOW) and 10~3 * T~(-1). Specimens of C. torosa collected during the mild and warm seasons have oxygen isotope compositions close to those of inorganic calcite precipitated in equilibrium with ambient water. The large oxygen-isotope variability observed during any season of the year most likely results from shell calcification in water bodies of highly variable salinity, alkalinity, Mg/Ca and water saturation relative to calcite. Indeed, distinct water bodies in the Akyatan Lagoon are generated by mixing of fresh and marine waters, which are exposed to different evaporation rates at the seasonal scale.

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《Journal of paleolimnology》 |2014年第2期|43-59|共17页
作者
Anne-Marie Bodergat; Christophe Lécuyer; Fran?ois MartineauAtike NazikKemal GürbüzSerge Legendre;
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作者单位

Laboratoire de Géologie de Lyon, UMR CNRS 5276, Université Lyon 1 et Ecole Normale Supérieure de Lyon, 69622 Villeurbanne, France;

Department of Geology, Engineering and Architecture Faculty, ?ukurova University, 01330 Balcali, Adana, Turkey;

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正文语种英语
中图分类自然地理学;陆地水文学、水文地理学（水象学）;
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Ostracod; Akyatan Lagoon; Salinity; Stable isotopes; Water paleothermometry;

Oxygen isotope variability in calcite shells of the ostracod Cyprideis torosa in Akyatan Lagoon, Turkey

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