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Environmental Mechanisms Governing Formation of the Lower Silurian Organic Matter-Rich Mudstones in Baltic Basin (Lithuania)

Summary The object of this research was the lower Silurian (Llandovery, Wenlock) succession in the Baltic Basin. The aim of this study was to assess the origin, type and thermal maturity of organic matter, distribution of litho- and organic facies, to reconstruct bottom-water redox conditions and to reveal the major regional and global mechanisms that had control on paleoenvironments and organic matter abundance in these shaly sediments. In order to reach the goal several methods were applied, e.g. sedimentological and petrographic studies, pyrite framboids measurements, organic and inorganic geochemistry, organic petrology, analysis of stable nitrogen and organic carbon isotopes. The study revealed that three sections: Aeronian, Telychian and Sheinwoodian-Homerian reflect different paleoenvironmental depositional conditions.