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  • 1
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    Neodymium isotopic variations in seawater (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Direct measurement of the isotopic composition of Nd in the Atlantic agree with the Nd content in ferromanganese sediments and differ from the observed amounts in the Pacific samples. These data indicate the existence of distinctive differences in the isotopic composition of Nd in the waters of major oceans; the average values determined from seawater and ferromanganese sediments are considerably lower than in sources with oceanic mantle affinities showing that the REE in the oceans is dominated by continental sources. The Nd isotopic variations in seawater are applied to relate the residence time of Nd and mixing rates between the oceans.
    Keywords: OCEANOGRAPHY
    Type: Earth and Planetary Science Letters; 50; 1, Oc; Oct. 198
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    NASA TECHNICAL REPORTS
  • 2
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    The isotopic composition of Nd in different ocean masses (1979)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The paper examines the isotopic composition of Nd in marine environments. The Sm-Nd data for authigenic ferromanganese sediments indicate that the Atlantic, Pacific, and Indian Oceans have a distinct range in Nd isotopic composition characteristics of each ocean basin and reflect the dissolved load of Nd in the water mass. Measurements of the Nd isotopic seawater composition of seawater indicate that the rare earth elements (REE) in ferromanganese sediments are derived by direct precipitation of these elements out of seawater. It is believed that the Nd isotopic variations in these sediments represent true variations in the dissolved Nd isotopic composition which reflect the age and (Sm-147)/(Nd-144) ratios of the continental masses sampled believed to be the major source of REE in seawater.
    Keywords: OCEANOGRAPHY
    Type: Earth and Planetary Science Letters; 45; 2; Nov. 197
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    NASA TECHNICAL REPORTS
  • 3
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    Rare earth element transport in the western North Atlantic inferred from Nd isotopic observations (1987)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The relationship between the Nd isotopic composition in the Atlantic waters and the origin and circulation of the water masses was investigated. Samples were collected in the western North Atlantic between 7 and 54 deg N. The isotopic composition (Nd-143/Nd-144 ratios) showed extensive vertical structure at all locations. In regions where a thermocline was well-developed, large isotopic shifts were observed across the base of the thermocline, while regions without a thermocline were characterized by much more gradual shifts in isotopic composition with depth. The data reveal an excellent correlation between the Nd isotopic distribution in the western North Atlantic water column and the distribution of water masses identified from temperature and salinity measurements.
    Keywords: OCEANOGRAPHY
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 51; 1257-127
    Format: text
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    NASA TECHNICAL REPORTS
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