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GREISENISATION [1 record]

Record 1 2004-10-05

English

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

A process of hydrothermal alteration in which feldspar and muscovite are converted to an aggregate of quartz, topaz, tourmaline, and lepidolite (i.e., greisen) by the action of water vapor containing fluorine.

CONT

There are many types of alteration, among these may be mentioned ... greisenization, a frequent form of alteration alongside tin-tungsten and beryllium deposits in granitic rocks or greisses ...

CONT

In the case of peralkaline systems, greisenization is rare and alteration is dominated instead by albitization (sodium metasomatism).

PHR

Extensive greisen alteration.

French

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

Puis vient une phase pneumatolytique qui donne trois formes d'altération : la tourmalinisation, la greisenisation et la kaolinisation.

CONT

Dans le cas des systèmes hyperalcalins, la greisenification est rare et l'altération est plutôt caractérisée par une albitisation (métasomatisme sodique).

PHR

Forte greisenification.

Spanish

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