Home > Publications database > ‘Co-evolution’ of uranium concentration and oxygen stable isotope in phosphate rocks > print

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024 7 _ |a 10.1016/j.apgeochem.2019.104476
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024 7 _ |a 0883-2927
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024 7 _ |a 1872-9134
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024 7 _ |a 2128/25751
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037 _ _ |a FZJ-2020-03191
082 _ _ |a 550
100 1 _ |a Sun, Y.
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245 _ _ |a ‘Co-evolution’ of uranium concentration and oxygen stable isotope in phosphate rocks
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a Phosphate rocks (PRs) used in fertilizer production contain uranium (U), which enters agricultural soils through phosphorus fertilization. However, our knowledge is still limited and cannot explain the different levels of U contamination found in agricultural systems. The paper reviewed the spatial and temporal U variations in PRs to obtain a comprehensive overview of U levels in various PRs worldwide and to investigate why U concentrations in igneous PRs are significantly lower compared to sedimentary PRs, and why less U is present in old sedimentary PRs (Precambrian-Cambrian) than in younger PRs (Ordovician-Neogene). In addition, the natural oxygen isotope compositions of phosphate (δ18Op) in various PRs were determined to identify their origins in relation to their U concentration. The δ18Op values differed among igneous PRs, old sedimentary PRs, and younger sedimentary PRs. Generally, the PRs with low δ18Op values had low U concentrations. In igneous PRs, low U concentrations were due to the lack of secondary U enrichment processes after rock formation, with low δ18Op values resulting from limited isotope fractionation at high temperature. Conversely, in sedimentary PRs, both U concentrations and δ18Op values were influenced by paleoclimate and paleogeographic features. Overall, there is a time-dependent coincidence of processes altering U concentration and δ18Op signatures of sedimentary PRs in a similar direction.
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700 1 _ |a Wu, Bei
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700 1 _ |a Haneklaus, S.
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700 1 _ |a Maekawa, M.
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700 1 _ |a Lücke, A.
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700 1 _ |a Schnug, E.
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700 1 _ |a Bol, R.
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773 _ _ |a 10.1016/j.apgeochem.2019.104476
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856 4 _ |y Published on 2019-11-20. Available in OpenAccess from 2021-11-20.
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856 4 _ |y Published on 2019-11-20. Available in OpenAccess from 2021-11-20.
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