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Geochemistry and origin of ferromanganese concretions in the Gulf of Bothnia
Luleå tekniska universitet.
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-2276-0564
1982 (English)In: Marine Geology, ISSN 0025-3227, E-ISSN 1872-6151, Vol. 50, no 1-2, p. 1-24Article in journal (Refereed) Published
Abstract [en]

Ferromanganese concretions cover large areas of the Gulf of Bothnia. They are flat to well-rounded, the rounded ones being richer in oxyhydroxides of iron and manganese. Rounded and ellipsoidal nodules, particularly those in the northern Gulf of Bothnia, are richest in Mn, Ni, Ba and Cu, which probably coexist in a Mn oxyhydroxide phase. Flat nodules are enriched in Fe, P, rare earths and As, probably associated with an Fe oxy-hydroxide component. Aluminum, V, Cr and Ti occur in still another phase. The sediments of the gulf generally consist of a 10-50 mm-thick layer of oxidized surface sediment, enriched in Mn, Ba, P and Ni lying on top of reduced sediments which are diagenetically depleted in these elements. The remobilized elements have redeposited in the nodules, but this process cannot explain the origin of all the nodular material. Some released Mn, Ba and Ni furthermore enter into suspended phases, which eventually leave the Baltic Sea. The economic value of the nodules in the Gulf of Bothnia is probably limited at present.

Place, publisher, year, edition, pages
1982. Vol. 50, no 1-2, p. 1-24
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-8143DOI: 10.1016/0025-3227(82)90058-5ISI: A1982PR04600005Scopus ID: 2-s2.0-0020329757Local ID: 69d13d10-e5f9-11dc-bcb4-000ea68e967bOAI: oai:DiVA.org:ltu-8143DiVA, id: diva2:981034
Note
Godkänd; 1982; 20080228 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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