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GRADATIONAL CONTACT [6 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

Save record 2

Record 3 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 3

Record 4 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 4

Record 5 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 5

Record 6 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 6

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