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FRACTURE CONTROL [7 records]

Record 1 2011-12-14

English

Subject field(s)
  • Tectonics
CONT

Alignment of linear cave segments and cave networks with fracture patterns, and direct observation of association of caves with faults and fractures indicate that fault and fracture control is common for caves in the Edwards Aquifer recharge zone …

French

Domaine(s)
  • Tectonique

Spanish

Save record 1

Record 2 2011-01-12

English

Subject field(s)
  • Vulcanology and Seismology
  • Geomorphology and Geomorphogeny
DEF

A volcano in the shape of a flattened dome, broad and low, built by flows of very fluid basaltic lava or by rhyolitic ash flows.

CONT

Volcanoes that have a long history of eruptions of the quiet lava type usually have gently slopes. They are called shield volcanoes or lava domes and the lava is usually of basaltic composition and low viscosity.

OBS

[Shield volcanoes] differ from the floods in being recognizably peaked... and from all other known volcanoes in being larger. Their distribution is linear, suggesting fracture control, but their contours form closed loops about individual centers or short fissures.

OBS

volcano (plural: volcanos or volcanoes).

OBS

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

Key term(s)
  • shield volcanos
  • shield volcanoes
  • Hawaiian volcanos
  • Hawaiian volcanoes

French

Domaine(s)
  • Volcanologie et sismologie
  • Géomorphologie et géomorphogénie
DEF

Volcan très étendu et à pente faible, érigé par éruption centrale de lave et construit à partir de la superposition des coulées successives de lave, de plusieurs dizaines de kilomètres de diamètre.

CONT

[Les volcans en boucliers] diffèrent des nappes de basalte en ce qu'ils ont un profil nettement conique [...] et de tous les autres volcans par leur plus grande taille. Leur distribution le long d'une ligne suggère leur liaison possible avec une fracture, mais leurs contours sont ceux de boucles formées autour de centres uniques, ou de courtes fissures.

CONT

Le cône de lave résulte de la superposition de couches de laves, issues du cratère principal, ou de fissures latérales.

OBS

Pluriel : volcans-boucliers.

OBS

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

Key term(s)
  • volcan hawaiien

Spanish

Campo(s) temático(s)
  • Vulcanología y sismología
  • Geomorfología y geomorfogénesis
Save record 2

Record 3 2005-01-07

English

Subject field(s)
  • Geochemistry
  • Metals Mining
CONT

A fundamental control on ore deposition was the pronounced adiabatic cooling of the ore fluids due to their sudden expansion into the fracture and/or breccia systems, thus the importance of structural control on ore deposition in porphyry deposits.

French

Domaine(s)
  • Géochimie
  • Mines métalliques
CONT

Un facteur de contrôle d'importance fondamentale du dépôt des phases métallifères est le refroidissement adiabatique marqué des fluides minéralisateurs consécutif à leur expansion subite dans les systèmes de fractures ou de brèches, phénomène qui illustre l'importance des contrôles structuraux sur le dépôt des phases métallifères dans les gîtes porphyriques.

Spanish

Save record 3

Record 4 2004-08-24

English

Subject field(s)
  • Thermodynamics
  • Atmospheric Physics
  • Geophysics
CONT

A fundamental control on ore deposition was the pronounced adiabatic cooling of the ore fluids due to their sudden expansion into the fracture and/or breccia systems, thus the importance of structural control on ore deposition in porphyry deposits.

OBS

In adiabatic processes, adiabatic cooling accompanies expansion, and adiabatic warming accompanies compression.

OBS

adiabatic process: The thermodynamic transformation which occurs without the exchange of heat between a system and its environment.

French

Domaine(s)
  • Thermodynamique
  • Physique de l'atmosphère
  • Géophysique
CONT

Un facteur de contrôle d'importance fondamentale du dépôt des phases métallifères est le refroidissement adiabatique marqué des fluides minéralisateurs consécutif à leur expansion subite dans les systèmes de fractures ou de brèches, phénomène qui illustre l'importance des contrôles structuraux sur le dépôt des phases métallifères dans les gîtes porphyriques.

OBS

Dans un processus adiabatique, un refroidissement adiabatique accompagne la détente et un réchauffement adiabatique accompagne la compression.

OBS

processus adiabatique : Transformation thermodynamique opérée sans échange de chaleur entre un système et son environnement.

Spanish

Campo(s) temático(s)
  • Termodinámica
  • Física de la atmósfera
  • Geofísica
OBS

En los procesos adiabáticos, una expansión produce un enfriamiento adiabático mientras que una compresión va acompañada de un calentamiento adiabático.

OBS

proceso adiabático : Transformación termodinámica que se realiza sin intercambio de calor entre el sistema considerado y el ambiente.

Save record 4

Record 5 1996-03-31

English

Subject field(s)
  • Waste Management
  • Nuclear Waste Materials
CONT

There are two forms of injection into deep geologic formations that have been suggested or used for LLW disposal: hydrofracture and deep well injection. Both methods are primarily useful only for liquid or finely ground wastes. They both take precautions to prevent contaminating useful aquifers by carefully selecting the geologic formations into which the waste is injected. Hydrofracture disposal also uses a very insoluble waste form. Generally, hydrofracture involves injection of a mixture of waste and liquid grouting materials under high pressure into a deep layered rock formation such as shale. The injected material causes layers of rock to separate and the material forms flat "sheets" extending out from the injection well. The grout causes some surface uplift near the injection well.

CONT

Because of difficulty in transporting liquid wastes safely, the hydrofracture facility must be located near the source of the waste. A hydrofracture site requires large, generally impermeable(to nearby aquifers) layered formations that fracture horizontally. The surface area needed and visual impact of a hydrofracture facility are relatively small. Major barriers to nuclide release are the grout(waste form) and the geologic formation used. Perhaps the greatest problem with hydraulic injection is that there is little control of fracture propagation and it is not possible to define the final geometry of the grout/waste sheets from the surface.

CONT

Hydrofracturing would not be appropriate for Eldorado wastes because of the large volume of waste and the questionable ability to dry and pulverize it to the necessary fineness (40 mesh or smaller).

French

Domaine(s)
  • Gestion des déchets
  • Déchets nucléaires

Spanish

Campo(s) temático(s)
  • Gestión de los desechos
  • Desechos nucleares
Save record 5

Record 6 1993-09-10

English

Subject field(s)
  • Waste Management
  • Nuclear Waste Materials
CONT

Because of difficulty in transporting liquid wastes safely, the hydrofracture facility must be located near the source of the waste. A hydrofracture site requires large, generally impermeable(to nearby aquifers) layered formations that fracture horizontally. The surface area needed and visual impact of a hydrofracture facility are relatively small. Major barriers to nuclide release are the grout(waste form) and the geologic formation used. Perhaps the greatest problem with hydraulic injection is that there is little control of fracture propagation and it is not possible to define the final geometry of the grout/waste sheets from the surface.

French

Domaine(s)
  • Gestion des déchets
  • Déchets nucléaires

Spanish

Save record 6

Record 7 1993-09-10

English

Subject field(s)
  • Waste Management
  • Nuclear Waste Materials
CONT

Because of difficulty in transporting liquid wastes safely, the hydrofracture facility must be located near the source of the waste. A hydrofracture site requires large, generally impermeable(to nearby aquifers) layered formations that fracture horizontally. The surface area needed and visual impact of a hydrofracture facility are relatively small. Major barriers to nuclide release are the grout(waste form) and the geologic formation used. Perhaps the greatest problem with hydraulic injection is that there is little control of fracture propagation and it is not possible to define the final geometry of the grout/waste sheets from the surface.

CONT

At Oak Ridge, Tennessee, the US Department of Energy has used hydrofracturing in shale formations for disposal of some liquid wastes. However, monitoring revealed that radionuclides are moving from the hydrofracture facility faster than expected and that operation has been stopped.

French

Domaine(s)
  • Gestion des déchets
  • Déchets nucléaires
OBS

Voir aussi «fracturation hydraulique».

Spanish

Save record 7

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