Partitioning of transition metals in oxidised and reduced zones of sulphide-bearing fine-grained sediments

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doi: 10.1016/S0883-2927(97)00093-0
Authors:Astrom, Mats
Author Affiliations:Primary:
Abo Akademi University, Department of Geology, Abo, Finland
Volume Title:Applied Geochemistry
Source:Applied Geochemistry, 13(5), p.607-617. Publisher: Pergamon, Oxford-New York-Beijing, International. ISSN: 0883-2927
Publication Date:1998
Note:In English. 53 refs.; illus., incl. 2 tables, sketch maps
Summary:Distributions and forms of transition metals were investigated in oxidized, partly oxidized and reduced zones of sediments located in the coastal areas of W Finland. Samples were taken from each 10 cm vertical section in pits ranging in depth between 2 and 3 m. Bulk samples for characterisation of species and forms of metals were taken from three zones (acidic and oxidizing zone, transition zone and reducing zone) in each pit. Vertical variation in Ti was small in each pit. Field observations, extractions and concentration-variation patterns indicate that Fe-oxide is largely precipitated in the acidic zone, though Fe is redistributed within profiles. Mn, Ni, Zn, Co and Cu have been lost from the acidic zone. Mn has been lost throughout the profile whilst Zn, Ni and Co are partly reprecipitated just above the reducing zone. Dissolved metal sulphates appear to be the major sources of the mobilized metal fractions. Much of the V and Cr in the sediments are associated with weathering-resistant minerals and these elements are only mobilized to a limited extent by the oxidation of the sulphide-bearing sediments. [M.E.H.]
Subsections:Sedimentary rocks
Subjects:Acid sulfate soils; Emission spectra; Metals; Mineral composition; Oxidation; Partitioning; PH; Reduction; Sampling; Sediments; Soil profiles; Soils; Spatial distribution; Spectra; X-ray diffraction data; Europe; Finland; Scandinavia; Western Europe; Quark Finland; Western Finland Province
Abstract Numbers:99M/584
Record ID:1998054423
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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