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MIAROLE [1 record]

Record 1 2011-05-05

English

Subject field(s)
  • Petrography
DEF

A cavity of irregular shape in certain plutonic rocks.

CONT

These [decimetric to metric textures] include pegmatitic comb layering, orbicular textures, miarolitic enclosures of pegmatitic quartz gabbro with crystal growth directed inward, and "brain-rock" ...

CONT

Miarolitic cavities ... are frequently infilled with hydrothermal minerals.

OBS

Crystals of the rock constituents sometimes project into the cavity.

OBS

Compare with "druse" and "vug."

OBS

miarolitic cavity: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
DEF

Dans une roche plutonique, en général granitique, petite cavité remplie de minéraux pneumatolytiques.

CONT

[...] la minéralisation de type brèche d'intrusion [...] présente une gamme de textures d'échelle décimétrique à métrique [...] Il s'agit notamment de textures pegmatitiques en dents de peigne, de textures orbiculaires, de miaroles, remplies de gabbro quartzique pegmatitique dont les cristaux croissent vers l'intérieur et de «roches en cervelle» [...]

CONT

Nombreuses miaroles souvent remplies de minéraux hydrothermaux.

OBS

miarole; cavité miarolitique : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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