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ORTHOFELSITE [1 record]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-01-30

English

Subject field(s)
  • Petrography
DEF

An igneous porphyritic rock containing phenocrysts of orthoclase in a felsitic groundmass.

OBS

... trachytes ... have often been described under the names orthophyre and orthoclase-porphyry, while trachyte was reserved for Tertiary and Recent rocks of similar composition.

French

Domaine(s)
  • Pétrographie
OBS

orthophyre : On désigne traditionnellement sous ce nom d'anciennes roches volcaniques acides (rhyolites et trachytes) d'âge carbonifère [qui] doivent leur nom à la présence de grands cristaux blancs de feldspath orthose, qui se détachent sur la pâte microlitique [...]

OBS

orthophyre : dénomination ancienne pour les trachytes.

Spanish

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