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@ARTICLE{Sun:884305,
      author       = {Sun, Y. and Amelung, W. and Wu, Bei and Haneklaus, S. and
                      Maekawa, M. and Lücke, A. and Schnug, E. and Bol, R.},
      title        = {‘{C}o-evolution’ of uranium concentration and oxygen
                      stable isotope in phosphate rocks},
      journal      = {Applied geochemistry},
      volume       = {114},
      issn         = {0883-2927},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2020-03191},
      pages        = {104476 -},
      year         = {2020},
      abstract     = {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.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000518403400002},
      doi          = {10.1016/j.apgeochem.2019.104476},
      url          = {https://juser.fz-juelich.de/record/884305},
}