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GRADATIONAL [11 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-04-09

English

Subject field(s)
  • Petrography
  • Geology
CONT

The setting, age, and chemistry of AQD/SC is similar to dioritic and charnockitic lithologies in other orogens of the North Atlantic region...

CONT

... intrusives of charnockitic composition, often intruded into pelitic supracrustal rocks.

CONT

Charnockitic rocks are lithologically and chemically gradational with the layered unit, possibly due to contact metamorphism and metasomatism of the anorthosite suite during intrusion of the charnockite.

French

Domaine(s)
  • Pétrographie
  • Géologie
CONT

Les complexes charnockitiques. Toutes les roches qui les constituent, des norites aux granites et aux gneiss à pyroxène, présentent un «air de famille», déterminé par une gamme de minéraux : plagioclase [...]; feldspath potassique perthitique [...] orthopyroxènes [...]; hornblende; biotite; ilménite [...] C'est à ces cortèges, et non à un type pétrographique déterminé qu'il faut aujourd'hui réserver le nom de «charnockites», ou mieux de «complexes charnockitiques.

CONT

Complexe charnockitique : association de granulites, de charnockites, de gabbros, d'anorthosites et de péridotites, caractéristique de la base de la croûte continentale.

Spanish

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Record 2 2012-03-02

English

Subject field(s)
  • Petrography
  • Soil Science
DEF

A sedimentary bed, usually thin, exhibiting graded bedding, generally having an abrupt contact with the fine material of the underlying bed but a gradational or indefinite contact near the top...

CONT

The preferred site of ore minerals is as cement between sand grains resulting in disseminated sulphide blebs or spots in massive sandstones or concentrations of sulphides along the lower, more porous, portions of graded beds.

French

Domaine(s)
  • Pétrographie
  • Science du sol
DEF

Couche caractérisée par la décroissance progressive de la taille des éléments, qui passe de grossière à la base à fine au sommet de la couche (granodécroissance).

CONT

Les minéraux métallifères se rencontrent préférentiellement sous forme de ciment s'insinuant entre les grains de sable détritiques. Dans les grès massifs, cela se traduira par des bulles ou taches de sulfures disséminées, alors que dans les parties inférieures plus poreuses des couches granoclassées, on observera des concentrations de sulfures plus étendues.

Spanish

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Record 3 2011-11-24

English

Subject field(s)
  • Cartography
  • Graphic Reproduction
  • Computer Graphics
DEF

A cartographic line feature which is symbolized on a map by an interrupted line.

CONT

... poorly-defined or gradational contacts are shown as dashed lines...

OBS

As opposed to "solid line" or "continuous line."

OBS

dashed line; broken line: terms used at Natural Resources Canada - Earth Sciences Sector; pecked line: term standardized by NATO.

French

Domaine(s)
  • Cartographie
  • Production graphique
  • Infographie
DEF

Symbole constitué par une ligne interrompue à intervalles réguliers.

CONT

Les contacts géologiques mal définis ou progressifs [sont représentés] par des tiretés [...]

OBS

tireté; ligne en tirets; traitillé; ligne en traitillé; ligne discontinue; trait discontinu : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

OBS

tiretés : terme et définition normalisés par l'OTAN.

Spanish

Campo(s) temático(s)
  • Cartografía
  • Reproducción gráfica
  • Gráficos de computadora
DEF

Símbolo que consiste en una línea discontinua a trazos regulares.

CONT

[Un] terreno sujeto a inundación controlada es un terreno inundado por la regulación del nivel de agua retenida por una represa. Los límites externos del área se muestran con una línea de trazos que representa el alcance máximo de la inundación.

Save record 3

Record 4 2011-06-09

English

Subject field(s)
  • Metals Mining
  • Economic Geology
DEF

A zone in ore deposits consisting of the top of Lindgren’s mesothermal zone and the bottom of the epithermal zone.

CONT

... epigenetic-hydrothermal deposits are classified according to their depth and temperature of formation-hypothermal deposits being deep-seated high temperature deposits; mesothermal deposits those formed at low temperatures and medium depths, and, thirdly, epithermal, near-surface deposits. Later terms include leptothermal to cover deposits gradational from mesothermal to epithermal, and telethermal for very low-temperature deposits formed at great distances from the source of the hydrothermal solutions which gave rise to them.

OBS

leptothermal ... Mineral grain size averages smaller and more variable than in mesothermal ores. There is an increased development of vugs toward the shallower limit of the zone. Rock alteration varies from sericitic to propylitic. Vertical depth range is estimated from 10,000 to 15,000 feet.

French

Domaine(s)
  • Mines métalliques
  • Géologie économique
CONT

On sépare quelquefois un type «leptothermal», qui correspond à la partie supérieure du mésothermal, sans posséder franchement les caractéristiques épithermales. Les textures rubanées et drusiques y sont plus développées que dans le mésothermal; le grain plus irrégulier.

Spanish

Save record 4

Record 5 2011-01-24

English

Subject field(s)
  • Geology
  • Various Metal Ores
OBS

At the base of the Lower Zone [of the Sudbury Igneous Complex] is the "Sublayer, "which contains the nickel-copper sulphide deposits... Its contact with the Lower Zone norite is reportedly sharp in some places, but is gradational in others.

OBS

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

French

Domaine(s)
  • Géologie
  • Minerais divers (Mines métalliques)
OBS

À la base de la Zone inférieure [du Complexe igné de Sudbury] se trouve la Couche de base (Sublayer) qui contient les minéralisations de sulfures de nickel-cuivre [...] Son contact avec la norite de la Zone inférieure serait franc à certains endroits, et progressif ailleurs.

OBS

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

Spanish

Save record 5

Record 6 2010-10-11

English

Subject field(s)
  • Petrography
DEF

An intrusive igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars.

CONT

Frequently at the contacts of skarns and intrusions there is a completely gradational contact and this is the case at the Memé copper mine where a large block of Cretaceous limestone has been surrounded by quartz-monzonite.

OBS

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

French

Domaine(s)
  • Pétrographie
DEF

Roche acide contenant orthose, plagioclase, quartz, hornblende et biotite.

CONT

[...] la minéralisation de nombreux porphyres cuprifères est liée à la densité de fracturation précoce des roches encaissantes, souvent des monzonites quartzifères.

OBS

Le terme d'«adamellite» peut être considéré comme synonyme de granite monzonitique.

OBS

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

Spanish

Save record 6

Record 7 2009-09-29

English

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

An arenite of pyroclastic debris, including rock particles, crystal debris, and glass fragments.

CONT

... sandstones composed exclusively of volcanic debris are called volcanic sandstone, and are gradational, through the interplay of eruptive and erosional processes, to tuff, the fragmental volcanic rocks produced by the disintegration of magma during explosive volcanic eruptions.

OBS

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

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Les roches épiclastiques correspondent à l'accumulation des produits de l'altération, de l'érosion et du transport de roches volcaniques ou volcaniclastiques [...] Elles sont classées en fonction de la taille de leurs éléments constitutifs en trois catégories : - Les conglomérats volcaniques épiclastiques dont la taille des éléments dépasse 64 mm; - Les grès volcaniques constitués de particules dont la taille est comprise entre 2 et 64 mm [...]; - Les pélites volcaniques épiclastiques, formées d'éléments plus petits que 2 mm.

OBS

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

Spanish

Save record 7

Record 8 2005-07-11

English

Subject field(s)
  • Geology
  • Various Metal Ores
CONT

At the base of the Lower Zone [of the Sudbury Igneous Complex] is the "Sublayer", which contains the nickel-copper sulphide deposits... Its contact with the Lower Zone norite is reportedly sharp in some places, but is gradational in others.

French

Domaine(s)
  • Géologie
  • Minerais divers (Mines métalliques)
CONT

À la base de la Zone inférieure [du Complexe igné de Sudbury] se trouve la Couche de base (Sublayer) qui contient les minéralisations de sulfures de nickel-cuivre [...] Son contact avec la norite de la Zone inférieure serait franc à certains endroits, et progressif ailleurs.

Spanish

Save record 8

Record 9 2003-12-11

English

Subject field(s)
  • Petrography
  • Various Metal Ores
DEF

A process wherein the residual liquid of a differentiating magma is injected into rifts formed in the crystallized fraction at a late stage by deformation of unspecified origin.

CONT

Four stages in the development of metallic oxide minerals can usually be recognized; syngenetic in the host rocks, autointrusions during the lithification and cooling of the host intrusive rocks, as late-stage dykes and intrusions associated with the anorthositic gabbro host rock, and in the skarn and alteration zones in the host and wall rock.

CONT

Concentrations of metallic oxide minerals... are conspicuously developed in... irregular to conformable autointrusions which have sharp to indistinct or gradational borders with earlier phases of the host anorthosite and gabbro, and were emplaced during the lithification and cooling of the host intrusive rocks...

French

Domaine(s)
  • Pétrographie
  • Minerais divers (Mines métalliques)
CONT

Les concentrations d'oxydes métalliques [...] peuvent être attribuées [au style suivant de minéralisation : ] minerai sous forme d'autoinjections irrégulières à concordantes montrant des contacts nets, indistincts ou progressifs avec les phases plus anciennes des anorthosites et gabbros hôtes; la mise en place de cette minéralisation s'est produite au cours de la lithification et du refroidissement des roches intrusives hôtes.

Key term(s)
  • autointrusion

Spanish

Save record 9

Record 10 2003-10-29

English

Subject field(s)
  • Geology
CONT

Concentrations of metallic oxide minerals... are conspicuously developed in... irregular to conformable autointrusions which have sharp to indistinct or gradational borders with earlier phases of the host anorthosite and gabbro, and were emplaced during the lithification and cooling of the host intrusive rocks...

French

Domaine(s)
  • Géologie
CONT

Les concentrations d'oxydes métalliques [...] peuvent être attribuées [au style suivant de minéralisation :] minerai sous forme d'autoinjections irrégulières à concordantes montrant des contacts nets, indistincts ou progressifs avec les phases plus anciennes des anorthosites et gabbros hôtes; la mise en place de cette minéralisation s'est produite au cours de la lithification et du refroidissement des roches intrusives hôtes.

Spanish

Save record 10

Record 11 1992-09-02

English

Subject field(s)
  • Petrography
  • Chronology
CONT

Frequently at the contact of skarns and intrusions there is a completely gradational contact and this is the case at the Memé copper mine where a large block of Cretaceous limestone has been surrounded by quartz-monzonite.

French

Domaine(s)
  • Pétrographie
  • Chronologie
CONT

Parmi les pays européens, seule la Yougoslavie se classe honorablement grâce aux mines de Bor (...) (sulfures au contact du calcaire crétacé et de microdiorites tertiaires).

Spanish

Save record 11

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