Sedimentary rock phosphates contain much higher concentrations of potentially hazardous elements (As, Cd, Cr,Pb, Se and U)than igneous rock phosphates. Why? Is it because U concentration in magmatic water is lower than in ocean water? how could U accomodate in the apatite of igneous?

  • $\begingroup$ I found this mining oriented description of how U becomes concentrated. $\endgroup$ Dec 10 '18 at 3:45
  • $\begingroup$ Interesting question. By the way, some magmatic apatites have lots of thorium, whereas there is almost no thorium in sedimentary apatites. $\endgroup$
    – Gimelist
    Dec 10 '18 at 8:41
  • $\begingroup$ Thanks for your answers and information. Very apprecited for that. One possible reason could be U become enriched in marine sedimentary by reworking after precipitation, in constract, igneous does not have that process. $\endgroup$
    – 孙雅杰
    Dec 10 '18 at 17:26

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