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Mineral and chemical compositions of a ferromanganese nodule from Station DM41-3911-76

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.784070
Keywords
  • Al
  • Als
  • Aluminium
  • Aluminosilicates
  • Amorphous Silica
  • Am Silica
  • Archive Of Ocean Data
  • Arcod
  • Asbolane-Buserite
  • Atomic Absorption Spectrometry (Aas)
  • Ba
  • Barium
  • Be
  • Beryllium
  • Bi
  • Birnessite
  • Bismuth
  • Cadmium
  • Caesium
  • Calculated
  • Cd
  • Ce
  • Ce/Ce*
  • Cerium
  • Cerium Anomaly
  • Co
  • Co/Ni
  • Cobalt
  • Copper
  • Cs
  • Cu
  • Dm41
  • Dm41-3911-76
  • Dmitry Mendeleev
  • Dy
  • Dysprosium
  • Er
  • Erbium
  • Eu
  • Eu/Eu*
  • Europium
  • Europium Anomaly
  • Fe
  • Fe-Vernadite
  • Fe-X
  • Fraction
  • Ga
  • Gadolinium
  • Gallium
  • Gd
  • Ho
  • Holmium
  • Icp-Ms
  • Inductively Coupled Plasma - Mass Spectrometry
  • Iron
  • Iron-X
  • La
  • Label
  • Lanthanum
  • Lead
  • Li
  • Light Rare-Earth Elements/Heavy Rare-Earth Elements Ratio
  • Lithium
  • Lree/Hree
  • Lu
  • Lutetium
  • Manganese
  • Manganese/Iron Ratio
  • Mn
  • Mn/Fe
  • Mo
  • Molybdenum
  • Multiple Investigations
  • Nd
  • Neodymium
  • Ni
  • Ni/Cu
  • Nickel
  • Nontronite
  • P
  • P/Fe
  • Pacific Ocean
  • Pb
  • Phosphorus
  • Phosphorus/Iron Ratio
  • Pr
  • Praseodymium
  • Ratio
  • Rb
  • Rubidium
  • Samarium
  • Sample Code/Label
  • Sample Type
  • Samp Type
  • Size Fraction
  • Sm
  • Sr
  • Strontium
  • Tb
  • Terbium
  • Th
  • Thallium
  • Thorium
  • Thulium
  • Ti
  • Titanium
  • Tl
  • Tm
  • Tungsten
  • U
  • Uranium
  • Vernadite
  • W
  • Wet Chemistry
  • X-Ray Diffraction
  • Y
  • Yb
  • Ytterbium
  • Yttrium
  • Zinc
  • Zn
Disciplines
  • Chemistry

Abstract

Processes of authigenic manganese ore formation in sediments of the North Equatorial Pacific are considered on the basis of a study of the surface layer (<2 mm) of a ferromanganese nodule and four micronodule size fractions from associated surface sediment (0-7 cm). Inhomogeneity of nodule composition is shown. Mn/Fe ratio is maximal in samples from lateral sectors of the nodule at the water-sediment interface. Compositional differences of nodules are related to preferential accumulation of trace elements in iron oxyhydroxides (P, Sr, Pb, U, Bi, Th, Y, and REE), manganese hydroxides (Co, Ni, Cu, Zn, Cd, Mo, Tl, W), and lithogenic component trapped during nodule growth (Ga, Rb, Ba, and Cs). Ce accumulation in the REE composition is maximal in the upper and lower parts of the nodule characterized by minimal Mn/Fe values. A compositional comparison of manganese micronodules and surface layers of the nodule demonstrates that micronodule material was subjected to more intense reworking during diagenesis of sediments. The micronodules are characterized by higher Mn/Fe and P/Fe, but lower Ni/Cu and Co/Ni ratios. The micronodules and nodules do not differ in terms of contents of Ce and Th that are the least mobile elements during diagenesis. Differences in chemical composition of the micronodules and nodules are related not only to additional input of Mn in the process of diagenesis, but also to transformation of iron oxyhydroxides after removal of Mn from the close association with Fe formed in suspended matter during sedimentation.

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