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allochthonous indirect genesis [1 record]

Record 1 2001-02-27

English

Subject field(s)
  • Bauxite Mining
  • Geochemistry
OBS

The mechanism is the same [as for autochthonous indirect genesis of bauxite], but the kaolinitic products are no longer in their original place. A good example is given by the Arkansas deposits ... In this case, the weathering products of the nepheline syenite were transported to a piedmont zone; these are kaolinitic and bauxitic alluvium on which the bauxitization mechanism will act, resulting in a zone of concretions, thus of encrustation cuirassement ...

French

Domaine(s)
  • Mines de bauxite
  • Géochimie
OBS

Le mécanisme [de la genèse indirecte allochtone des bauxites] est le même [que pour la genèse indirecte autochtone], mais les produits kaoliniques ne sont plus à leur place. Un bon exemple est fourni par les gisements de l'Arkansas [...] Dans ce cas, les produits d'altération de la syénite néphélinique de l'Arkansas ont été transportés dans une zone de piedmont : ce sont des alluvions kaoliniques et bauxitiques, sur lesquelles le mécanisme de la bauxitisation va s'exercer, avec une zone de libération de l'alumine, puis une zone de concrétions, donc de cuirassement [...]

Spanish

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