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HELICITIC [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-02-09

English

Subject field(s)
  • Mineralogy
  • Gemmology
CONT

A spectacular example of synkinematic porphyroblast growth is provided by the so-called snowball garnets, which have spiral trails of inclusions that indicate rotation of either the garnet or the matrix foliation during garnet growth.

CONT

Garnets in certain metamorphic rocks contain inclusion fabrics whose geometry is very similar to that of the model. Such syntectonic, snowball, or rotational garnets, as they have previously been termed, can be studied in three dimensions.

OBS

Pinwheel garnet and snowball garnet are designations sometimes applied to those garnets whose inclusions appear to have been rotated. These garnets occur sporadically in foliated metamorphic rocks. Although their presence in diverse rocks has been interpreted variously, present-day consensus appears to be that they represent rotation during growth under conditions of dynamic metamorphism that involved differential pressures.

OBS

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

French

Domaine(s)
  • Minéralogie
  • Gemmologie
DEF

Grenat ayant subi une rotation en cours de métamorphisme.

CONT

Le grenat hélicitique possède des inclusions se disposant en spirale.

OBS

hélicitique : Caractérise les minéraux disposés en forme de spirale dans une roche métamorphique ayant subit une rotation.

OBS

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

Spanish

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Record 2 2010-11-29

English

Subject field(s)
  • Petrography
  • Mineralogy
OBS

helicitic : Pertaining to a metamorphic-rock texture consisting of bands of inclusions that indicate original bedding or schistosity of the parent rock and cut through later-formed crystals of the metamorphic rock. The relict inclusions commonly occur in porphyroblasts as curved and contorted strings. The term was originally, but is no longer, confined to microscopic texture. Also spelled : helizitic.

French

Domaine(s)
  • Pétrographie
  • Minéralogie
CONT

[Dans] la structure hélicitique, certains porphyroblastes pivotent au fur et à mesure de leur croissance et les traînées d'inclusions qu'ils renferment forment des lignes sinueuses (structure en S) [...]

CONT

[...] des structures hélicitiques [...] sont des restes de microplissement antérieur apparaissant dans certains cristaux, le plus souvent albite, grenat ou staurotide [...]

Spanish

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Record 3 1998-08-10

English

Subject field(s)
  • Petrography
  • Mineralogy
  • Tectonics
DEF

Pertaining to a metamorphic-rock texture consisting of bands of inclusions that indicate original bedding or schistosity of the parent rock and cut through later-formed crystals of the metamorphic rock. The relict inclusions commonly occur in porphyroblasts as curved and contorted strings.

French

Domaine(s)
  • Pétrographie
  • Minéralogie
  • Tectonique
DEF

Se dit d'une structure en hélice, due à une croissance synchrone de mouvements tectoniques.

CONT

[...] la structure hélicitique : certains porphyroblastes pivotent au fur et à mesure de leur croissance et les traînées d'inclusions qu'ils renferment forment des lignes sinueuses (structure en S) [...]

Spanish

Save record 3

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