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CHEMINEE ALTERATION [1 record]

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Record 1 2005-11-16

English

Subject field(s)
  • Erosion and Weathering (Geol.)
  • Geochemistry
CONT

Wall rock alteration is usually confined to the footwall rocks. Chloritization and sericitization are the two commonest forms. The alteration zone is pipe-shaped and contains within it and towards the centre the chalcopyrite-bearing stockwork. The diameter of the alteration pipe increases upward until it is often coincident with that of the massive ore. ... Of the many massive sulphide ores in sedimentary environments few are underlain by alteration pipes.

French

Domaine(s)
  • Érosion et corrosion (Géologie)
  • Géochimie
CONT

Dans certains gisements, les lentilles de pyrite se localiseraient au-dessus d'une cheminée d'altération.

Spanish

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