Igneous phosphate rocks contain less uranium than sedimentary rocks
Geochemical analyses confirm that igneous phosphate rocks contain significantly lower uranium concentrations than sedimentary phosphate rocks due to distinct formation and enrichment processes.
The claim is specific, empirical, and falsifiable. Papers [0] and [1] both provide direct geochemical data and comparative reviews demonstrating that igneous phosphate rocks contain lower levels of uranium than sedimentary phosphate rocks. No papers refute the claim.
Z. S. Altschuler, R. Clarke, E. Young. The geochemistry of uranium in apatite and phosphorite. 1957. https://doi.org/10.3133/TEI701
Paper 0 establishes that primary igneous apatite typically contains 0.001 to 0.01 percent uranium, whereas sedimentary marine apatite contains 0.005 to 0.02 percent and can reach up to 0.1 percent.
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Y. Sun, W. Amelung, B. Wu, S. Haneklaus, M. Maekawa, A. Lücke, E. Schnug, R. Bol. ‘Co-evolution’ of uranium concentration and oxygen stable isotope in phosphate rocks. 2020. https://doi.org/10.1016/j.apgeochem.2019.104476
Paper 1 explicitly reviews uranium levels in various phosphate rocks and confirms that uranium concentrations in igneous phosphate rocks are significantly lower compared to sedimentary phosphate rocks.
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