TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

For igneous rocks composed for the most part of mafic minerals (amphibole, pyroxene, olivine), with accessories and little or no feldspar.  3, record 1, English, - ultramafic

Record number: 1, Textual support number: 1 OBS

ultramafic: ... Now often preferred to "ultrabasic," to which it corresponds, as more directly describing the mineral content.  3, record 1, English, - ultramafic

Record number: 1, Textual support number: 2 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.  4, record 1, English, - ultramafic

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

[Qualifie une roche] comportant une forte proportion de fer et de magnésium.  4, record 1, French, - ultramafique

Record number: 1, Textual support number: 1 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.  5, record 1, French, - ultramafique

Record number: 1, Textual support number: 1 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.  4, record 1, French, - ultramafique

Record number: 1, Textual support number: 1 PHR

Complexe ultrabasique.  5, record 1, French, - ultramafique

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

[An] igneous rock consisting essentially of ferromagnesian minerals to the virtual exclusion of quartz, feldspar, and feldspathoids.  7, record 2, English, - ultrabasic%20rock

Record number: 2, Textual support number: 1 CONT

Economic deposits of the mineral chromite are almost universally associated with mafic or ultra-mafic rocks.  4, record 2, English, - ultrabasic%20rock

Record number: 2, Textual support number: 1 OBS

Originally defined as rocks containing less than 45% silica, this artificial boundary has now been abandoned as a result of the recognition of many rock types which while undoubtedly ultrabasic by other tests, contain more than 45% silica ...  7, record 2, English, - ultrabasic%20rock

Record number: 2, Textual support number: 2 OBS

According to the source MROCK, 1985 (Richard Scott Mitchell, Dictionary of Rocks), the terms "ultramafic rock" and "ultrabasic rock" are nearly synonymous. They differ in that ultrabasic rocks contain little or no feldspar while ultramafic rocks contain no feldspar.  8, record 2, English, - ultrabasic%20rock

Record number: 2, Textual support number: 3 OBS

As a noun, the term "ultramafic" is used in the plural.  8, record 2, English, - ultrabasic%20rock

Record number: 2, Textual support number: 4 OBS

ultramafics: term used at Natural Resources Canada - Earth Sciences Sector.  8, record 2, English, - ultrabasic%20rock

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Roche magmatique mélanocrate à holomélanocrate pauvre en silice (SiO₂ <45 %) et riche en calcium, fer et magnésium, constituée essentiellement d'un ou plusieurs minéraux ferromagnésiens (péridot, pyroxène, amphibole).  7, record 2, French, - roche%20ultrabasique

Record number: 2, Textual support number: 1 OBS

La notion d'acidité, quelque peu ambiguë pour les roches, a été introduite au milieu du siècle dernier par Élie de Beaumont qui, en fonction de la teneur en SiO₂, distingue les roches acides [plus de 65 %], les roches intermédiaires [entre 52 et 65 %], les roches basiques [entre 45 et 52 %] et les roches ultra-basiques [moins de 45 %].  8, record 2, French, - roche%20ultrabasique

Record number: 2, Textual support number: 2 OBS

ultramafite : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.  9, record 2, French, - roche%20ultrabasique

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 OBS

ultrabasique : S'applique aux roches magmatiques de couleur sombre contenant moins de 45 % en poids de SiO₂, d'où absence de cristaux de quartz et très riches en Mg, Fe et Ca (40 % et plus).  3, record 3, French, - roche%20plutonienne%20ultra%2Dbasique

Record 3,  Textual support,  Spanish