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GABBROIQUE [14 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-12-12

English

Subject field(s)
  • Petrography
  • Geochemistry
CONT

Typical ophiolite sequences are comprised of a thin layer of deep-sea sediments, overlying a sequence of basaltic pillow lavas, sheeted dike complexes, foliated to layered gabbro, and finally an ultramafic complex, which can have an exposed thickness of up to 7 km. This ultramafic section of ophiolite sequences can vary in composition; however, it is most commonly dominated by varieties of peridotite typically associated with the mantle such as harzburgite (olivine and orthopyroxene rich), and lherzolite (olivine, ortho- and clinopyroxene rich), with secondary wehrlite (clinopyroxene and olivine rich) and dunite (olivine rich) ...

OBS

ultramafic complex: term used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • ultra-mafic complex
  • ultra mafic complex

French

Domaine(s)
  • Pétrographie
  • Géochimie
CONT

Les participants à la conférence de Penrose en 1972 [...] ont défini le terme «ophiolite» comme étant un assemblage distinctif de roches mafiques à ultramafiques qui comprend, de haut en bas 1) un complexe ultramafique consistant en proportion variable d’harzburgite, de lherzolite et de dunite ayant habituellement une fabrique tectonique, 2) un complexe gabbroïque à texture de cumulats [...], 3) un complexe de dykes, 4) un complexe de roches volcaniques généralement en coussin.

OBS

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

Spanish

Save record 1

Record 2 2011-08-18

English

Subject field(s)
  • Mineralogy
DEF

A mineral of the feldspar group which consists of an aluminosilicate of calcium and sodium.

OBS

Named after a locality of the Labrador Coast. Not to be confused with the rock labradorite.

French

Domaine(s)
  • Minéralogie
DEF

Feldspath sodi-calcique.

CONT

En toute rigueur, seules les roches les plus profondes méritent l'appellation de gabbros, leurs plagioclases étant des labradors [...] Les minéraux présents dans la masse gabbroïque varient progressivement [...] : les plagioclases évoluent régulièrement depuis le labrador [...] jusqu'à l'oligoclase [...]

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Aluminosilicato de calcio y sodio que cristaliza en el sistema triclínico; sus cristales se encuentran en las andesitas cuarcíferas.

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Record 3 2011-04-06

English

Subject field(s)
  • Geology
DEF

The part of the Earth's crust lying underneath oceans at an average water depth of 4.5 km, composed of several different layers: sedimentary, basaltic, gabbroic.

CONT

The oceanic crust lies atop Earth's mantle, as does the continental crust.

OBS

... there are two distinctly different types of crust – oceanic and continental. Variations in their composition, density, and thickness help to account for difference in their topography, relative age, and history of formation.

OBS

oceanic crust: term used at Natural Resources Canada - Earth Sciences Sector.

PHR

Subducting oceanic crust.

French

Domaine(s)
  • Géologie
DEF

Partie de la croûte terrestre qui se trouve sous les océans sous une tranche d’eau d’une profondeur moyenne de 4, 5 km, composée de plusieurs couches différentes : sédimentaire, basaltique, gabbroïque.

CONT

Au cours des temps géologiques, l’écorce se différencia en une croûte continentale formée principalement de roches granitiques [...] et en une croûte océanique formée de roches basaltiques [...]

OBS

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

PHR

Croûte océanique plongeante.

Spanish

Campo(s) temático(s)
  • Geología
CONT

Casi todos los yacimientos minerales que se conocen, incluso los más antiguos, se encuentran en la corteza continental, bien en secuencias de rocas que reflejan la proximidad de ésta durante el período de mineralización o bien en fragmentos de corteza oceánica que se han integrado en la corteza continental.

Save record 3

Record 4 2010-12-23

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
CONT

A sheeted dyke complex is a normal component of an ophiolite, a piece of oceanic crust that has been emplaced within a sequence of continental rocks. The dykes act as feeders for the overlying sequence of extrusive rocks typically pillow lavas, together forming layer 2 of the oceanic crust. As each injection of a dyke represents one increment of seafloor spreading, each dyke is normally intruded into earlier dykes. The dykes are typically dolerites but plagiogranites (trondhjemites) often form a significant part of the complex.

CONT

In the sheeted dike complex, each dike intrudes older dikes, and the very first dikes formed may be on opposite sides of an ocean. The sheeted dike complex is the smoking gun of an ophiolite. Other ophiolite rocks can form in other settings, but a sheeted dike complex requires continuous crustal spreading to form.

CONT

The McLaughlin deposit is centered around the sheeted vein complex, a large multistage vein swarm, localized in a dilation zone formed by rheologic contrasts in the footwall polymictic melange. The surface expression of the sheeted vein complex is a subaerial sinter terrace, which merges into the sheeted vein complex.

OBS

sheeted dyke complex: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Les gisements de type Chypre se localisent essentiellement dans des complexes ophiolitiques, où des basaltes coussinés recouvrent des complexes de dykes en feuillets, qui recouvrent un complexe intrusif gabbroïque dont la composition devient de plus en plus ultramafique à la base pour devenir des péridotites.

CONT

Complexe de dykes feuilletés, près du lac de l’Est. Tous les dykes sont boninitiques et orientés approximativement nord-sud.

OBS

complexe de dykes feuilletés : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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Record 5 2007-10-23

English

Subject field(s)
  • Petrography
CONT

Jotunites are orthopyroxene-bearing rocks of mainly monzodioritic composition, commonly containing appreciable Fe-Ti oxide and apatite.

OBS

In the past, jotunites have been called gabbro-anorthosite, ferrodiorite, monzodiorite, gabbroic anorthosites, and oxide-apatite-gabbronorites.

OBS

Jotunites are distinguished from minor products of crystallization of anorthosite by their higher concentrations of Ti, Fe, and especially P.

OBS

monzodiorite: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
CONT

Les jotunites sont des roches à orthopyroxène de composition principalement monzodioritique qui contiennent fréquemment des quantités appréciables d’oxydes de Fe-Ti et d’apatite.

OBS

Elle se distinguent des produits mineurs de la cristallisation de l’anorthosite par leurs concentrations plus élevées de Ti, de Fe et tout particulièrement de P.

OBS

Dans le passé, la jotunite a été appelée «gabbro-anorthosite», «ferrodiorite», «monzodiorite», «anorthosite gabbroïque» et «gabbronorite à oxydes-apatite».

OBS

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

Spanish

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Record 6 2005-03-07

English

Subject field(s)
  • Petrography
DEF

Of or pertaining to gabbro; having the nature of gabbro.

CONT

The associated intrusive rocks, including batholiths, stocks, sills and dykes, range in composition from gabbroic to granitic ...

CONT

Gabbroic intrusion.

French

Domaine(s)
  • Pétrographie
DEF

Se dit des roches magmatiques dont les caractères minéralogiques ou chimiques sont ceux des gabbros.

CONT

Intrusion de gabbro.

CONT

Feuillets gabbroïques.

Spanish

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Record 7 2004-10-13

English

Subject field(s)
  • Petrography
DEF

Said of a rock resembling gabbro.

French

Domaine(s)
  • Pétrographie

Spanish

Save record 7

Record 8 2004-09-24

English

Subject field(s)
  • Petrography

French

Domaine(s)
  • Pétrographie

Spanish

Save record 8

Record 9 2003-11-17

English

Subject field(s)
  • Petrography
CONT

Whilst chromite accumulations are nearly all in ultrabasic rocks and to a lesser extent in gabbroic or noritic rocks, ilmenite accumulations show an association with anorthosites ...

CONT

There is both a spatial and a geochemical relationship in that [nickel sulphide] deposits associated with gabbroic igneous rocks have a high Cu/Ni ratio ...

French

Domaine(s)
  • Pétrographie
DEF

[...] roche qui possède, en partie ou en totalité, les caractères du gabbro et des massifs de roches de ce type.

Spanish

Save record 9

Record 10 2003-10-07

English

Subject field(s)
  • Petrography

French

Domaine(s)
  • Pétrographie

Spanish

Save record 10

Record 11 2003-10-06

English

Subject field(s)
  • Petrography

French

Domaine(s)
  • Pétrographie

Spanish

Save record 11

Record 12 2003-10-01

English

Subject field(s)
  • Petrography

French

Domaine(s)
  • Pétrographie

Spanish

Save record 12

Record 13 1992-12-03

English

Subject field(s)
  • Petrography
CONT

Large ilmenite and titaniferous magnetite deposits ... are classified on the basis of mineralogy into two main types: those consisting mainly of ilmenite hosted in massive or layered anorthosite ...; and complex mineral assemblages of titaniferous magnetite and ilmenite in gabbroic anorthosite.

French

Domaine(s)
  • Pétrographie
CONT

[...] des anorthosites gabbroïques avec lits riches en magnétite titanifère.

Spanish

Save record 13

Record 14 1992-06-03

English

Subject field(s)
  • Petrography
  • Metals Mining
CONT

Titaniferous magnetite deposits ... are most commonly developed in the gabbroic phases at the margins of gabbro-anorthosite intrusive stocks and in the gabbro-diorite stocks, dykes and sills associated with major gabbro intrusions.

CONT

Large ilmenite and titaniferous magnetite deposits related to anorthosite and gabbroic anorthosite metallogenes ... occur as irregular masses and disseminations in layered or massive anorthositic and gabbroic intrusions.

CONT

Many small to medium sized magnetite deposits occur in gabbroic intrusions but the really big tonnages occur in the stratiform lopoliths.

French

Domaine(s)
  • Pétrographie
  • Mines métalliques
CONT

Les gîtes [de magnétite] sont en relation spatiale avec les intrusions gabbroïques [...]

CONT

Dans le Bouclier canadien, le titane [...] est associé aux grandes intrusions anorthositiques et gabbroïques qui vont de l’Archéen [...] à l’Hélikien [...]

Spanish

Save record 14

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