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Uranium - Coggle Diagram

- - - - controlled by faults
  - - - reduced when fault cuts across graphic unit
    - - fluids meet at unconformity surface and U6+ is reduced to U4+
- - - - more soluble
      - uranyl
      - aqueous complexes when cations available
      - carnotite
    - - less soluble
      - uranous
      - uraninite (crystaline)
        
        U3O8
      - pitchblende (amorphous)
      - more common in deposits
  - - - uraninite, pitchblende
    - - weathering and remineralisation creating colourful oxides
      - hydrated uranium silicates
      - gummites (secondary hydrated uranium oxide mixture)
- - - - hydrothermal fluids from below are carrying U6+ in solution
      - meets reducing fluid from above and is reduced to u4+ and precipitated
      - U6+ leached from rocks and carried in oxidised solution
      - reducing fluid is flowing over reduced rock
- - - - best deposits found between impermeable units containing organic debris/pyrite to promote reduction
      - uranium reduced by reducing agents within sandstone
        
        interbedded volcanics with ferromagnesium
        
        hydrocarbons
        
        sulphides
        
        carbonaceous materials
      - interbedded with shales and mudstones
  - - - uranium in granites dissolved
        
        move deeper meet reducing conditions in porous rocks cause uranium precipitation
        
        precipitation at fluid interface at curved redox front
        
        fluid continuously precipitating and remobilising until fluid stops moving
        
        end point determined by final resting point of groundwater