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• W2084481447 abstract "We measured rare earth element (REE) concentrations in river waters to characterize the suspended and dissolved river flux of the REE to the oceans. The REE pattern of river suspended materials is sensitive to drainage basin geology. A positive correlation is observed between La/Yb ratios and Nd model ages for the rivers studied. Major rivers have light REE enriched patterns relative to the North American Shale Composite (NASC), with (La/Yb)N = 1.6−2.7. River water dissolved material ( < 0.2 μm) is heavy REE enriched relative to suspended material, and the most pronounced negative Ce anomalies occur in rivers of high pH. Light REE concentrations vary by approximately 3 orders of magnitude and are inversely related to pH and major cation concentrations. From these data, we estimate that typical major river runoff has heavy REE depleted suspended material with (La/Yb)N ≈ 1.9. We conclude that the terrigenous input to the oceans from major rivers is heavy REE depleted relative to shales. From the available data, average river water dissolved material appears to be heavy REE enriched with (La/Yb)N ≈ 0.4. Estuarine removal processes lower the dissolved REE river flux by approximately 60% and result in a flux that is more heavy REE enriched with (La/Yb)N ≈ 0.2. Calculated oceanic residence times with respect to river input range from 2300 to 21,000 years, are shortest for Ce, and greatest for the heavy REE and La. Such long residence times may suggest the presence of additional sources of REE in seawater." @default.
• W2084481447 created "2016-06-24" @default.
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• W2084481447 date "1988-06-01" @default.
• W2084481447 modified "2023-10-12" @default.
• W2084481447 title "Rare earth elements in river waters" @default.
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• W2084481447 doi "https://doi.org/10.1016/0012-821x(88)90031-3" @default.
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