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ORTHOCUMULATE [1 record]

Record 1 2003-10-27

English

Subject field(s)
  • Petrography
DEF

A cumulate composed chiefly of one or more cumulus minerals plus the crystallization products of the intercumulus liquid.

CONT

The massive chromitites at Kemi and Bird River Sill contain 50 to 70 modal per cent chromite and are texturally orthocumulate rocks.

OBS

The distinction between orthocumulates, mesocumulates, and adcumulates is reflected directly in the ore grade and also partly determines whether the ore must be beneficiated prior to smelting; it is therefore of great economic significance.

French

Domaine(s)
  • Pétrographie
CONT

Les chromitites massives du gisement de Kemi et du Filon-couche de Bird River contiennent, selon l'analyse modale, entre 50 et 70 % de chromite et constituent, en termes texturaux, des orthocumulats.

OBS

La distinction entre orthocumulat, mésocumulat et adcumulat se traduit directement dans la teneur du minerai et détermine en partie si le minerai doit être enrichi avant l'étape de fusion; elle est donc de grande importance économique.

OBS

cumulat : Roche magmatique grenue, formée de l'accumulation et de la cimentation de cristaux denses automorphes au sein d'un magma, lors de la cristallisation fractionnée.

Spanish

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