New Data on Paleogeography of Quaternary Coast Sediments of the Rivers of the European North of Russia Using Isotope-Geochemical Methods

(1) Background: The Quaternary river bank deposits of the European North Russia contain several mollusk fossils that can give important past-climate information which is relevant to understand evolution climate in Holocene period and predict future scenarios on change. (2) purpose research: reconstruction main physical chemical parameters habitat mollusks based determination species study isotope-geochemical composition shells their host deposits. (3) Object study: coastal outcrops rivers Russia: Pechora Sula, Peza, bivalve shells, fragments. (4) Results: revealed macrofauna complexes represented by bivalves (Arctica islandica, Hiatella arctica, Mytilus edulis, Tridonta borealis, Mya truncata, Neptunea despecta) were determined variations δ13C δ18O (‰) isotopes studied fossil calculated. data concentrations elements summarized. content varied within following limits: Fe 101.7−403.3 µg/g (Vastyansky Kon’, Pechora), Mg 0.38–2.61 Ba 18.27–60.44 (village Oksino-River Sula), Sr 1128.3–2275.34 Kon’-village Oksino, Pechora). ratio between varies Ba/Sr 0.011–0.041 Oksino- River Sula) Mg/Fe 0.01–0.15 Kon’- village