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What are rare earths and why do they cluster near alkaline magmatism?

'Rare earths' play a vital role in the modern economy, and they are becoming more of a point of focus in geopolitical realms. What are 'rare earths' and why do they appear to cluster in association with:

  • alkaline to peralkaline igneous complexes
  • pegmatites associated with alkaline magmas/carbonatite intrusives
  • perovskite mineral phases within akaline complexes
  • mantle derived carbonate melts
  • hydrothermal deposits associated with alkaline magmatism

Rare Earths

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