Osmium in marine sediments

Osmium in marine sediments

Osmium is enriched in ferromanganese minerals, and its concentrations follow those of other Pt-group metals except Pd. Oxidative capture during solid formation is the probable mechanism for uptake. In some sediments forming under reducing conditions (phosphorites and anoxic coastal deposits) there i...

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Veröffentlicht in:Geochimica et cosmochimica acta 1991-06, Vol.55 (6), p.1641-1648
Hauptverfasser: Koide, Minoru, Goldberg, Edward D., Niemeyer, Sidney, Gerlach, David, Hodge, Vern, Bertine, Kathe K., Padova, Alfreda
Format: Artikel
Sprache:eng
Schlagworte:
580000 - Geosciences
CHEMICAL REACTIONS
CHEMISTRY
ECOLOGICAL CONCENTRATION
ELEMENTS
GEOCHEMISTRY
GEOSCIENCES
HYDROGEN COMPOUNDS
INTERFACES
METALS
MINERAL CYCLING
OSMIUM
OXIDATION
OXYGEN COMPOUNDS
PALLADIUM COMPOUNDS
PHOSPHATE ROCKS
PHOSPHORITES
PLATINUM COMPOUNDS
PLATINUM METALS
REDOX POTENTIAL
REDOX REACTIONS
REDUCTION
ROCKS
SEAS
SEAWATER
SEDIMENT-WATER INTERFACES
SEDIMENTARY ROCKS
SEDIMENTS
SURFACE WATERS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VALENCE
WATER
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Beschreibung
Zusammenfassung:Osmium is enriched in ferromanganese minerals, and its concentrations follow those of other Pt-group metals except Pd. Oxidative capture during solid formation is the probable mechanism for uptake. In some sediments forming under reducing conditions (phosphorites and anoxic coastal deposits) there is also an enrichment. This may relate to reductive capture, although deposits also formed under reducing conditions from hydrothermal areas are depleted in osmium.
ISSN:0016-7037
1872-9533
DOI:10.1016/0016-7037(91)90135-R