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An integrated magnetic-chemical approach to the study of iron in Rhône estuary sediments

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...

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Published in:Oceanologica acta 1998-01, Vol.21 (1), p.81-86
Main Authors: Zeri, Christina, Scoullos, Michael
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Language:English
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description 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. De paramètres magnétiques, combinés à la partition du fer dans différentes fractions (authigénique-lithogénique) des sédiments, ont été utilisés afin d'y étudier l'évolution du fer. Cette approche montre que le fer associé au réseau métallique domine dans les sédiments de l'estuaire du Rhône où il est représenté par les minéraux ferrimagnétiques. Une fraction importante (∼ 17 %) est attribuée au fer authigénique, principalement associé aux formes d'oxydes-hydroxydes. Elle est originaire des dépôts fluviaux directs et des processus diagénétiques in situ. Les oxydes-hydroxydes de fer, formés dans la colonne d'eau et/ou dans les eaux d'infiltration, sont accumulés principalement dans la couche de surface (0–2 cm) de la colonne sédimentaire et correspondent à la goethite.
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subjects Brackish
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geophysics: general, magnetic, electric and thermic methods and properties
Internal geophysics
Marine
Marine and continental quaternary
Surficial geology
title An integrated magnetic-chemical approach to the study of iron in Rhône estuary sediments
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