Manganese accumulation and solid-phase speciation in a 3.5 </ce:hsp>m thick mud sequence from the estuary of an acidic and Mn-rich creek, northern Baltic Sea

Manganese accumulation and solid-phase speciation in a 3.5 m thick mud sequence from the estuary of an acidic and Mn-rich creek, northern Baltic Sea

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文摘

•: We observed a highly variable and episodic Mn distribution in a sediment core from a boreal estuary fed by Mn-rich water.
•: Mn concentrations increased episodically in two Mn-enrichment zones (2.3–4.9 to 10–25 g kg^− 1, 1.9–3.9 to 6.7–12 g kg^− 1).
•: Mn concentrations are relatively low and stable elsewhere in the core.
•: Mn occurs as rhodochrosite in the Mn-enrichment zones, while as surface-sorbed complexes in recent sediments (uppermost 60 cm).
•: The Mn distribution reflects deposition of Mn (hydr-)oxides, rather than input or redox-related translocation of Mn.