Uranium concentrations in marine sediments

Mo, Tin; Suttle, A.D.; Sackett, William M.

doi:10.1016/0016-7037(73)90242-1

Cited by 98 publications

(15 citation statements)

References 16 publications

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“…Ku and BROECKER 1969;Mo et al 1973;MARGOLIS et al 1978) (see also SUGIMURA et al 1975;KUNZEN DORF andF RIEDRICH 1976a, b, 1977;KORKISCH et al 1977). The nodules analysed here display U and Th values typical of those obtained for deep-sea nodules by these authors.…”

Section: Elderfield 1976)supporting

confidence: 68%

The distribution of rare earth, precious metal and other trace elements in Recent and fossil deep-sea manganese nodules.

Glasby

Keays

Rankin³

1978

Geochem. J.

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Four deep-sea manganese nodules and one fossil nodule from Timor have been analysed for 45 elements (major elements, rare earths and precious metals) by X-ray fluorescence, spark source mass spectrometry and neutron activation analysis. Co-existing sediments from two nodule sites in the South western Pacific Basin have also been analysed. Differences in nodule composition are apparent, particularly for the Timor nodule. The trace metal compositions of this nodule, however, reveals it to be a typical deep-sea nodule, although some element redistribution has clearly taken place since exposure of the nodule on land. The distribution of a number of elements including Tl, Ir, Pd, Au and the rare earth elements between deep-sea nodules and their associated sediments appears to be dependent on a number of factors including the major element composition of the nodule (e.g. dilution by the silicate phase of the nodule), the differing stability of various element complexes in seawater, and the influence of differences in redox states on complex stability. Au and Si, on the other hand, are positively correlated in nodules and sediments possibly because they have a common source, either submarine detritus or basalt-seawater interaction. The rare earth contents of the sediments from the N.E. sector of the Southwestern Pacific Basin are high compared with previous determinations of rare earths in marine sediments and show no evidence of Ce depletion relative to La on a shale-normalised basis. These high contents reflect the well oxidised conditions and low sedimentation rates of this environment.

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Section: Elderfield 1976)supporting

confidence: 68%

The distribution of rare earth, precious metal and other trace elements in Recent and fossil deep-sea manganese nodules.

Glasby

Keays

Rankin³

1978

Geochem. J.

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“…In terms of the sedimentary removal pathway, it appears that for sedimentary conditions near those for conversion of Fe 3+ to Fe 2+ , soluble U (VI) is reduced, perhaps through microbial mediation, to insoluble U (IV) (e.g., Cochran et al, 1986;Anderson, 1987;McKee et al, 1987;Barnes and Cochran, 1990;Lovley et al, 1991;Lovley et al, 1993;Fredrickson et al, 2000;King et al, 2000;Chaillou et al, 2002;Sani et al, 2004). Because this reduction potential is typically achieved in close proximity to the sediment-water boundary in continental shelf and slope environments, these sediments have elevated U concentrations relative to oxic environments (Dorta and Rona, 1971;Mo et al, 1973;Veeh et al, 1974;Degens et al, 1977;Bloch, 1980;Yamada and Tsunogai, 1983/84;Anderson et al, 1989a,b;Calvert and Pedersen, 1993;Legeleux et al, 1994;Morford and Emerson, 1999;Dunk et al, 2002;Nameroff et al, 2002;and others).…”

Section: Uranium Geochemistrymentioning

confidence: 96%

Molybdenum and uranium geochemistry in continental margin sediments: Paleoproxy potential

McManus

Berelson

Severmann

et al. 2006

Geochimica et Cosmochimica Acta

325

177

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“…Compared with Mo, uranium prefers to accumulate in reducing sediments (Mo et al, 1973;Calvert and Pedersen, 1993;Dunk et al, 2002). Uranium is present as a stable U (VI) carbonate complex at a concentration of ~13 nM in seawater (Ku et al, 1977), but the soluble U (VI) is microbially reduced to insoluble U (IV) (Cochran et al, 1986).…”

Section: Molybdenum Authigenesis In Continental Margin Settingsmentioning

confidence: 99%

Molybdenum isotope composition from Yangtze block continental margin and its indication to organic burial rate

Zhou

Huang

Archer

et al. 2007

Front. Earth Sci. China

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The paper presents the molybdenum isotope data, along with the trace element content, to investigate the geochemical behavior of authigenic Mo during long-term burial in sediments in continental margin settings of the Yangtze block, as well as their indication to the burial of original organic carbon. The burial rate of original organic carbon was estimated on the basis of the amount of sedimentary sulfur (TS content), whilst the carbon loss by aerobic degradation was estimated according to calculated Mn contents. On these points, the original organic carbon flux was calculated, exhibiting a large range of variation (0.17-0.67 mmol/m 2 /day). The strong correlation between sedimentary Mo isotope values and organic carbon burial rates previously proposed on the basis of the investigations on modern ocean sediments, was also used here to estimate the organic carbon burial rate. The data gained through this model showed that organic carbon burial rates have large variations, ranging from 0.43-2.87 mmol/m 2 /day. Although the two sets of data gained through different geochemical records in the Yangtze block show a deviation of one order of magnitude, they do display a strong correlation. It is thus tempting to speculate that the Mo isotope signature of sediments may serve as a tracer for the accumulation rate of original organic carbon in the continental margin sediments.

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Uranium concentrations in marine sediments

Cited by 98 publications

References 16 publications

The distribution of rare earth, precious metal and other trace elements in Recent and fossil deep-sea manganese nodules.

The distribution of rare earth, precious metal and other trace elements in Recent and fossil deep-sea manganese nodules.

Molybdenum and uranium geochemistry in continental margin sediments: Paleoproxy potential

Molybdenum isotope composition from Yangtze block continental margin and its indication to organic burial rate

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