Reference sediment core and paleogeography of the underwater Slupsk river foredelta in the Baltic Sea |
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| Authors: | E M Emelyanov E S Trimonis G Vaikutiéné J Harff |
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| Institution: | 1.Atlantic Branch, Shirshov Institute of Oceanology (IO RAN),Russian Academy of Sciences,Kaliningrad,Russia;2.Vilnius University,Vilnius,Lithuania;3.Institute of the Baltic Sea Research,Varnemunde,Germany |
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| Abstract: | Core Psd-590 (length 947 cm, water depth 124 m) penetrated the entire sequence of marine (Littorina) mud (730 cm) and stopped
in gray lacustrine (Ancylus) clays with hydrotroilitic films. The Littorina mud is gray-colored, microlaminated in the interval
of 730 to 700 cm, and dark gray with hydrotoilitic films and obscure microlamination higher in the section. According to the
diatom data, typical marine sediments begin at the level of 620 cm, while the lithological-geochemical data indicate this
change at the level of 730 cm. This level is marked by a considerable increase in the concentrations of SiO2amorph, CO2, Corg, and Mn in the sediments. In the interval of 730 to 620 cm, diatoms are represented by both freshwater and brackish-water
species. The Littorina transgression began in the form of individual flows of saline North Sea waters into the Baltic Sea,
which is evident from the microlamination and sharp peaks in the concentrations of the chemical elements. The transgression
exhibits two weakening and one strengthening (core interval of 380 to 220 cm) stages; the latter was marked by the maximal
water salinity. The post-Littorina mud contains molluscan shells and fish bones and is enriched in the fraction of 0.05–0.01
mm. The microlaminated Littorina mud was deposited during periods with stagnant conditions in the bottom water layer, while
the homogenous sediments accumulated during periods of its aeration. |
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