On the oxidation states of Mn and Fe in polymetallic oxide/oxyhydroxide crusts from the Atlantic Ocean
Identifieur interne : 000385 ( France/Analysis ); précédent : 000384; suivant : 000386On the oxidation states of Mn and Fe in polymetallic oxide/oxyhydroxide crusts from the Atlantic Ocean
Auteurs : A. Boughriet [France] ; B. Ouddane [France] ; M. Wartel [France] ; C. Lalouj [France] ; C. Cordier [France] ; L. Gengembre [France] ; J. P. Sanchez [France]Source :
- Deep-Sea Research Part I [ 0967-0637 ] ; 1996.
Abstract
A general study of the oxidation states of iron and manganese in selected polymetallic oxide/oxyhydroxide crusts was undertaken by means of 57Fe Mössbauer X-ray and photoelectron spectroscopies, X-ray diffraction, and electron spin resonance. Spectroscopic analyses allowed the differentiation of these crusts from their origins: “hydrogenous” or “hydrothermal”. This paper shows that polymetallic oxide/oxyhydroxide crusts with high Mn:Fe ratios (⩾34.4) contain manganese in the form of todorokite. When the Mn:Fe ratios in the crusts are ⩽ 1, spectroscopic data indicate the occurrence of Fe(III) and Mn(IV) in the forms of goethite and δ-MnO2, respectively. In addition, Mn(III) ions incorporated inside the goethite structure to give α-Fe(III)1−xMn(III)xOOH (where x represents the molar fractions: x=Mn/(Mn+Fe)) are strongly suspected in these ferromanganese deposits. This problem is addressed in the present work from crystallographic considerations.
Url:
DOI: 10.1016/0967-0637(96)00013-1
Affiliations:
- France
- Auvergne-Rhône-Alpes, Hauts-de-France, Nord-Pas-de-Calais, Rhône-Alpes, Île-de-France
- Gif Sur Yvette, Grenoble, Villeneuve D'Ascq
Links toward previous steps (curation, corpus...)
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- to stream Istex, to step Curation: 000B53
- to stream Istex, to step Checkpoint: 000831
- to stream Main, to step Merge: 001029
- to stream Main, to step Curation: 000F90
- to stream Main, to step Exploration: 000F90
- to stream France, to step Extraction: 000385
Links to Exploration step
ISTEX:A27997AC21B842B7D25F4E6E7B1732869B1CC83ELe document en format XML
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Spectroscopic analyses allowed the differentiation of these crusts from their origins: “hydrogenous” or “hydrothermal”. This paper shows that polymetallic oxide/oxyhydroxide crusts with high Mn:Fe ratios (⩾34.4) contain manganese in the form of todorokite. When the Mn:Fe ratios in the crusts are ⩽ 1, spectroscopic data indicate the occurrence of Fe(III) and Mn(IV) in the forms of goethite and δ-MnO2, respectively. In addition, Mn(III) ions incorporated inside the goethite structure to give α-Fe(III)1−xMn(III)xOOH (where x represents the molar fractions: x=Mn/(Mn+Fe)) are strongly suspected in these ferromanganese deposits. This problem is addressed in the present work from crystallographic considerations.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Hauts-de-France</li><li>Nord-Pas-de-Calais</li><li>Rhône-Alpes</li><li>Île-de-France</li></region><settlement><li>Gif Sur Yvette</li><li>Grenoble</li><li>Villeneuve D'Ascq</li></settlement></list><tree><country name="France"><region name="Hauts-de-France"><name sortKey="Boughriet, A" sort="Boughriet, A" uniqKey="Boughriet A" first="A." last="Boughriet">A. Boughriet</name></region><name sortKey="Cordier, C" sort="Cordier, C" uniqKey="Cordier C" first="C." last="Cordier">C. Cordier</name><name sortKey="Gengembre, L" sort="Gengembre, L" uniqKey="Gengembre L" first="L." last="Gengembre">L. Gengembre</name><name sortKey="Lalouj, C" sort="Lalouj, C" uniqKey="Lalouj C" first="C." last="Lalouj">C. Lalouj</name><name sortKey="Ouddane, B" sort="Ouddane, B" uniqKey="Ouddane B" first="B." last="Ouddane">B. Ouddane</name><name sortKey="Sanchez, J P" sort="Sanchez, J P" uniqKey="Sanchez J" first="J. P." last="Sanchez">J. P. Sanchez</name><name sortKey="Wartel, M" sort="Wartel, M" uniqKey="Wartel M" first="M." last="Wartel">M. Wartel</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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