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ARGILISATION [4 records]

Record 1 2005-08-11

English

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

A form of hydrothermal alteration in which certain minerals are converted to clay minerals.

CONT

The potassic zone dies out, sericitic and argillic alteration become important and the upper limit of economic mineralization is reached.

CONT

All the veins are bordered by zones of alteration. This usually consists of sericitization next to the vein followed outwards by intermediate argillic alteration and then by propylitization. In deeper parts of Butte, advanced argillic alteration is present next to the veins.

PHR

Pale argillic alteration.

French

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

Des ciments calcaires ou ferrugineux arrivent à donner de la cohésion à une altérite [...] Mais l'altération argileuse a l'effet inverse. Les minéraux argileux sont peu résistants à l'érosion mécanique : l'eau courante peut les creuser facilement.

CONT

On distingue, du centre vers la périphérie, trois types d'altération dont l'importance [...] varie selon le niveau d'érosion : potassique [...]; argileuse, avec kaolinite, montmorillonite et un lessivage du calcium faisant disparaître les carbonates et l'épidote; propylitique [...]

CONT

Comment se fait l'argilisation? [...] Il y a d'une part appauvrissement en ions et, pour les minéraux d'origine non phylliteux, destruction de la structure mais d'autre part des néoformations : au cours de l'altération se constituent des minéraux argileux par synthèse, suivant des processus [...] mal connus [...]

OBS

Ne pas confondre avec «argilification» qui est un processus de formation d'argile.

PHR

Argilisation pâle.

Spanish

Save record 1

Record 2 2005-03-08

English

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

Advanced argillic alteration. This alteration is characterized by dickite, kaolinite ..., pyrophyllite ... and quartz. ... This is one of the more intense forms of alteration, often present as an inner zone adjoining many base metal vein or pipe deposits ... This alteration involves extreme leaching of bases ... from all aluminous phases such as feldspars and micas ...

CONT

Advanced argillic ... and adularia-type ... epithermal alteration zones with associated precious-metal deposits occur above or near several porphyry copper and copper-molybdenum deposits.

French

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

Des zones d'altération épithermale de type argilisation avancée [...] et du type à adulaire [...] accompagnées de minéralisations de métaux précieux, se rencontrent au-dessus de plusieurs gîtes porphyriques de cuivre et de cuivre-molybdène ou à leur proximité.

OBS

L'altération argileuse [...] se sépare en deux stades : a) altération diffuse [...]; b) altération plus intense, restreinte, très liée aux fractures et au contact lave-monzonite [...]

Spanish

Save record 2

Record 3 2004-12-09

English

Subject field(s)
  • Mineralogy
CONT

The advanced argillic assemblages include illite, quartz, alunite, natroalunite, pyrophyllite, diaspore, and a high pyrite content.

French

Domaine(s)
  • Minéralogie
CONT

Les associations minérales du faciès d'argilisation avancée comprennent l'illite, le quartz, l'alunite, la natroalunite, la pyrophyllite, le diaspore et la pyrite en abondance.

Spanish

Save record 3

Record 4 2004-08-24

English

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

Intermediate argillic alteration. The principal minerals are ... kaolin- and montmorillonite-group minerals occurring mainly as alteration products of plagioclase ... Sulphides are generally unimportant.

French

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

Spanish

Save record 4

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