Abstract
Measurement of magnetic parameters in combination with the partitioning of iron in various sediment fractions (authigenic-lithogenous) have been used in order to obtain information concerning the fate of iron within the sediment. Through this approach, it is shown that in the Rhône estuary sediments there is a dominance of the lattice-held iron, represented by the abundance of ferrimagnetic minerals. A considerable part (∼ 17 %) of the iron present is authigenic, associated mainly with the oxide-hydroxide forms and originating from direct fluvial inputs and in situ diagenetic processes. Iron oxides and hydroxides are formed in the water column and/or porewaters and are accumulated mainly in the surface layer (0–2 cm) of the sediment column corresponding to the mineral goethite.
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