, Volume 38, Issue 1, pp 1-11

Geochemistry of Diagenesis of Sediments in the Barents Sea: Forms of Iron and Sulfur

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The chemical composition of sediments of cores taken from different areas of the Barents Sea was studied. The study involves reactive iron (Fereact) and reduced sulfur. The surficial oxidized layer with a thickness of 0.5–25 cm is characterized by increased content of Fe(III) in the form of oxyhydroxides and possibly hydroxophosphates. This layer is locally enriched in Mn. Reactive iron in sediments of horizons, which underlie the oxidized layer, is probably present mainly in the composition of silicates. The role of sulfides (acid-soluble phases and pyrite) among Fereact forms is predominantly subordinate. The core of pre-Holocene sediments is characterized by a strong correlation between the total content of reduced sulfur and its isotopic composition. This testifies to authigenic origin of pyrite in the pre-Holocene mud.