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-PHYRIC [1 record]

Record 1 2011-02-07

English

Subject field(s)
  • Petrography
DEF

An adjective (or suffix) referring to porphyritic texture.

CONT

The plagioclase-phyric Jozini rhyolites, which are volumetrically the more significant unit, directly overlie the Sabie River basalts along most of the length of the Lebombo. Together with the sparsely quartz-phyric Mbuluzi rhyolites (and associated subsidiary quartz-phyric Oribi Beds), which are laterally discontinuous and occur principally in Swaziland, the two formations comprise a maximum thickness of around 5000 m of continuous rhyolite with no interbedded basalts.

OBS

The terms phyric and glomeroporphyritic indicate the presence of phenocrysts and clusters of phenocrysts, respectively.

OBS

Volcanic rocks classified according to the nature and abundance of phenocryst assemblages are often described as aphyric when 1% phenocrysts are visible with a hand lens. ... The suffix "-phyric" includes all of the phenocryst phases that occur in the rock, as long as the total content >1%.

OBS

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

French

Domaine(s)
  • Pétrographie
CONT

Deux phénotypes de coulées peuvent être observés, ceux à phénocristaux de plagioclases (mousse de plagioclases) principalement à la limite des basaltes des marges externes et ceux aphyriques, pauvres en phénocristaux de plagioclases constituant les laves en coulées de type «aa» [...]

OBS

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

PHR

À phénocristaux de feldspath, de plagioclase, de quartz.

Spanish

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