URANIUM IN THE OCEANS - WHERE IT GOES AND WHY

被引:574
作者
KLINKHAMMER, GP [1 ]
PALMER, MR [1 ]
机构
[1] UNIV BRISTOL,DEPT GEOL,BRISTOL B58 1RJ,ENGLAND
关键词
D O I
10.1016/0016-7037(91)90024-Y
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Uranium is removed from the oceans by diffusion across the sediment-water interface of organic-rich sediments. This pathway is the largest single sink in the global budget of this element. Dissolved uranium is drawn into suboxic sediments along a concentration gradient established by the precipitation of an insoluble phase which forms when U(VI) is reduced to U(IV). This transformation occurs relatively late in the diagenetic sequence, after the microbially mediated dissolution of manganese and iron oxides, and may be induced by the onset of sulfate reduction. Metallo-organics play an important role in the diagenetic behavior of this element as some uranium is released into solution when labile organics are consumed at the sediment-water interface. In contrast, the diagenesis of authigenic Fe- and Mn-oxides exerts negligible influence on the uranium diagenetic cycle. Variations in the uranium concentration of sediment with time are controlled directly by the uranium content of the source material settling from the water column, and indirectly, by the organic content of this material and the sedimentation rate. Since diffusion from seawater influences dramatically the short-term burial rate of uranium, down-core distributions of dissolved and solid uranium can provide an estimate of recent sedimentation rates in rapidly accumulating sediments.
引用
收藏
页码:1799 / 1806
页数:8
相关论文
共 49 条
  • [11] URANIUM RELOCATIONS AND DERIVATION OF QUASI-ISOCHRONS FOR A TURBIDITE PELAGIC SEQUENCE IN THE NORTHEAST ATLANTIC
    COLLEY, S
    THOMSON, J
    TOOLE, J
    [J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1989, 53 (06) : 1223 - 1234
  • [12] URANIUM ANOMALY IN BLACK SEA SEDIMENTS
    DEGENS, ET
    KHOO, F
    MICHAELIS, W
    [J]. NATURE, 1977, 269 (5629) : 566 - 569
  • [13] DORTA CC, 1971, B MAR SCI, V21, P754
  • [14] FORMATION OF METAL-RICH DEPOSITS AT RIDGE CRESTS
    EDMOND, JM
    MEASURES, C
    MANGUM, B
    GRANT, B
    SCLATER, FR
    COLLIER, R
    HUDSON, A
    GORDON, LI
    CORLISS, JB
    [J]. EARTH AND PLANETARY SCIENCE LETTERS, 1979, 46 (01) : 19 - 30
  • [15] EARLY OXIDATION OF ORGANIC-MATTER IN PELAGIC SEDIMENTS OF THE EASTERN EQUATORIAL ATLANTIC - SUBOXIC DIAGENESIS
    FROELICH, PN
    KLINKHAMMER, GP
    BENDER, ML
    LUEDTKE, NA
    HEATH, GR
    CULLEN, D
    DAUPHIN, P
    HAMMOND, D
    HARTMAN, B
    MAYNARD, V
    [J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1979, 43 (07) : 1075 - 1090
  • [16] HILLAIREMARCEL C, 1990, GEOLOGY, V18, P162, DOI 10.1130/0091-7613(1990)018<0162:ROTUID>2.3.CO
  • [17] 2
  • [18] PORE WATERS OF THE CENTRAL PACIFIC-OCEAN - NUTRIENT RESULTS
    JAHNKE, R
    HEGGIE, D
    EMERSON, S
    GRUNDMANIS, V
    [J]. EARTH AND PLANETARY SCIENCE LETTERS, 1982, 61 (02) : 233 - 256
  • [19] INTENSIFICATION OF RECYCLING OF ORGANIC-MATTER AT THE SEA-FLOOR NEAR OCEAN MARGINS
    JAHNKE, RA
    REIMERS, CE
    CRAVEN, DB
    [J]. NATURE, 1990, 348 (6296) : 50 - 54
  • [20] JARVIS I, 1987, GEOL SOC LOND SPEC P, V31, P179, DOI DOI 10.1144/GSL.SP.1987.031.01.14