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HOLOLEUCOCRATIC [1 record]

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Alphabetical list of terms

Record 1 2017-05-09

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
  • Mineralogy
DEF

Term applied to facies of igneous rocks, or to a series of related rocks, which are almost completely composed of light ... minerals ...

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
  • Minéralogie
DEF

Se dit de roches magmatiques contenant plus de 90 % de quartz, de feldspathoïdes et de feldspaths. (Ces roches présentent au microscope, plus de 90 % de minéraux incolores, et elles sont claires.)

CONT

La proportion des minéraux foncés, facilement appréciable au simple coup d'œil, fournit une classification abrégée, mais évidemment moins précise. On distingue les groupes suivants : Roches hololeucocrates 0 à 5 [% de minéraux foncés].

CONT

Il s'agit d'une pipe de greisens au contact d'une petite coupole de roche hololeucocrate intrusive à grain fin, et à mica blanc, dans un encaissant de gneiss et micaschistes.

Spanish

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