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Iron and manganese - Coggle Diagram

- - - - where there is no radioactivity you can infer iron presence
- - - - less photosynthesis in winter, more silca-rich dominance
- - - - algae
      - iron oxyhydroxides
  - - - evolution of these organisms just occuring
- - - - controlled by meteoric water infiltrate exposed surface
      - weathering and oxidation surface minerals causing redistribution
        
        oxidation fe2+ to fe3+ precipitated
      - concentrates iron in secondary deposits with higher concentration
      - ore leached from surface and precipitated below water table
        
        fe2+ soluble and transported in fluids
    - - soil enriched in REEs and iron
      - weathering and erosion of iron rich rocks
    - - wet - dominated by physical erosion from water overflow
      - dry - dominated by chemical weathering by infiltrating rocks