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REE Geochemistry of the Uranium Phases in Syn-Magmatic and Hydrothermal-Type U-Mineralisation: Two Case Histories from India
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In the plot of EREE vs. chondrite-normalised LREE/HREE, except for those in the granite-hosted syn-magmatic type, the rest of U-phases as well as uraninite from other types (taken from literature) define a trend of positive correlation. The minimum-end of the ZREE is represented by the unconformity-type of Collins Bay, Canada and Pine Creek deposits, Australia, and the maximum-end of SREE by hydrothermal vein type in the granite at Gogi. The syn-magmatic granite-hosted uraninite from Kullampatti, Rossing and Faraday plot close to each other, but away from the main positive trend toward a higher EREE.
In simple oxides of uranium, LREE, MREE and HREE, appear to co-exist or substitute, respectively, for Ca, Th and U, as indicated by the corresponding increasing trends. During post-magmatic alteration of uraninite to gummite and samarskite to betafite, there is a notable depletion of especially the HREE. During coffinitisation of pitchblende or replacement of coffinite by pitchblende, there is a similar depletion, especially the LREE in the former and the MREE in the latter.
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