Arctic freshwater ostracods from modern periglacial environments in the Lena River Delta (Siberian Arctic, Russia): geochemical applications for palaeoenvironmental reconstructions

摘要: The aim of this study is to describe ostracods from freshwater habitats in the Siberian Arctic order estimate present-day relationships between environmental setting and geochemical properties ostracod calcite. A special focus on element ratios (Mg/Ca, Sr/Ca), stable isotope composition (δ18O, δ13C), both ambient waters most common species are Fabaeformiscandona pedata F. harmsworthi with highest frequency all studied waters. Average partition coefficients D(Sr) 0.33 ± 0.06 (1σ) females, 0.32 males. near 1:1 relationship δ18O was found, a mean shift Δmean = 2.2‰ 0.5 heavier values calcite as compared not dependent δ18Owater, caused by metabolic (vital) temperature effects. Temperature-dependence reflected variations shift. For vital effect inorganic equilibrium quantified 1.4‰. Results valuable for palaeoenvironmental interpretation data fossil permafrost deposits.