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ULTRABASIC [1 record]

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Alphabetical list of terms

Record 1 2015-04-08

English

Subject field(s)
  • Petrography
  • Geochemistry
DEF

For igneous rocks composed for the most part of mafic minerals (amphibole, pyroxene, olivine), with accessories and little or no feldspar.

OBS

ultramafic: ... Now often preferred to "ultrabasic," to which it corresponds, as more directly describing the mineral content.

OBS

The term [ultrabasic] is frequently used interchangeably with ultramafic. Although most ultrabasic rocks are also ultramafic, there are some exceptions; e.g. monomineralic rocks composed of pyroxenes are ultramafic but are not ultrabasic because of their high SiO2 content.

French

Domaine(s)
  • Pétrographie
  • Géochimie
DEF

[Qualifie une roche] comportant une forte proportion de fer et de magnésium.

CONT

Le nickel se concentre avec un facteur pouvant dépasser 10 à partir de la roche-mère ultrabasique dont les teneurs sont de l'ordre de 0,30 %. On aboutit ainsi aux gîtes de nickel latéritiques.

OBS

Le terme «ultrabasique» fait référence à la faible proportion de silice contenue dans les nodules. Les auteurs anglo-saxons, quant à eux, qualifient plutôt les nodules d'«ultramafiques» ce qui fait référence à leur forte proportion de fer et de magnésium, en pratique les deux qualificatifs recouvrent généralement la même réalité.

PHR

Complexe ultrabasique.

Spanish

Campo(s) temático(s)
  • Petrografía
  • Geoquímica
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