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alkali basalt [1 record]

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Record 1 2010-05-13

English

Subject field(s)
  • Petrography
  • Geochemistry
CONT

Diamonds ... are found in ... various igneous rock types of deep-seated origin (kimberlite, orangeite, lamproite, alnoite, aillikite, picritic monchiquite, alkali basalt) ...

OBS

alkali basalt: A collective term for extrusive matic rocks containing modal or mormative feldspathoids (usually nepheline). Olivine and Ti-rich augite are the dominant ferromagnesian silicates in these rocks.

OBS

Alkali basalts are the volcanic equivalents of alkali gabbros.

OBS

alkali basalt; alkali-olivine basalt: terms used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
  • Géochimie
DEF

[...] l'une des deux grandes familles de basalte [qui] est constituée de basaltes sous-saturés mélanocrates, à olivine abondante, labrador, augite, peu calcique et titanifère, avec souvent un peu de feldspathoïde et de mélilite.

CONT

[...] on distingue deux types principaux de basaltes : les basaltes tholéitiques [...]; les basaltes alcalins, ou basaltes à olivine, très pauvres en silice.

CONT

Les diamants se rencontrent dans [...] des roches ignées d'origine profonde de différents types (kimberlite, orangéite, lamproïte, alnoïte, aillikite, monchiquite picritique et basalte alcalin) [...]

OBS

Ces basaltes [alcalins] sont plus riches que les tholéiites en Na2O et K2O. Ils sont surtout présents dans les volcans continentaux et parfois dans les arcs insulaires.

OBS

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

Spanish

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