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Record 1 2009-11-17

English

Subject field(s)
  • Petrography
  • Mineralogy
DEF

A gas cavity or vesicle, in an igneous rock that is filled with such secondary minerals as calcite, quartz, chalcedony, or a zeolite.

CONT

At some stage after lava has solidified, the vesicles may be filled by a variety of secondary minerals, especially calcite and zeolites. The infilled vesicles are referred to as amygdales ...

CONT

... the copper minerals fill intergranular spaces in clastic sedimentary host rocks, and spaces in the matrices of flow-top breccias and in amygdules in amygdaloidal flow tops.

OBS

The term amygdale is preferred in British usage.

OBS

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

French

Domaine(s)
  • Pétrographie
  • Minéralogie
DEF

Cavité en forme d'amande, fréquente dans les roches volcaniques, due à la présence de gaz et souvent tapissée de cristaux tardifs : zéolite, calcite, quartz.

CONT

Les basaltes et les andésites renferment du cuivre, qui peut s'exprimer dans des amygdales de la lave sous l'effet de solutions hydrothermales. [...] le cuivre [...] se concentre secondairement dans les vacuoles lors d'une phase d'altération hydrothermale.

CONT

Au sommet des coulées, se développe un faciès à amygdales, riche en cuivre. [...] Zéolites et zoïsite remplissent partiellement les amygdales.

OBS

amygdale : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Campo(s) temático(s)
  • Petrografía
  • Mineralogía
DEF

Vacuola en forma de almendra creada en el seno de las rocas volcánicas por una burbuja de gas y que, posteriormente a su formación, se ha llenado de calcita, ceolita o de otros minerales secundarios.

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