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GRAYWACKE [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2009-09-29

English

Subject field(s)
  • Petrography
CONT

Metamorphic sandstones are those which have been subjected to heat. They are too hard to work for building purposes, but are very suitable for breaking into road metal.

CONT

Graywacke is a metamorphic sandstone in which grains or fragments of various minerals, as quartz and feldspar, or of rocks, as slate and siliceous clay rocks, are embedded in an indurated matrix, which may be siliceous or argillaceous.

French

Domaine(s)
  • Pétrographie
DEF

Grès [qui] a subi une altération métamorphique par la pression, transformant ainsi sa structure.

CONT

Les quartzites, qui sont des grès métamorphiques au grains fusionnées, sont des roches très denses, mais qui se gélifractionnent bien avec la fissuration [...]

Spanish

Save record 1

Record 2 2009-05-25

English

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

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

Key term(s)
  • volcanic-lithic greywacke
  • volcanic lithic graywacke
  • volcanic lithic greywacke

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
OBS

grauwacke : Roche détritique sombre, pauvre en quartz, riche en débris de roches variées et à ciment détritique abondant très chloriteux.

OBS

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

Key term(s)
  • grauwacke volcanolithique

Spanish

Save record 2

Record 3 2006-11-02

English

Subject field(s)
  • Petrography
OBS

Similar to graywacke but has less feldspar and more and better rounded quartz grains.

French

Domaine(s)
  • Pétrographie
CONT

[...] les subgrauwackes seraient particulièrement riches en illite et chlorite, la kaolinite étant subordonnée, mais plus abondante dans les niveaux gréseux.

Spanish

Save record 3

Record 4 2005-07-05

English

Subject field(s)
  • Analytical Chemistry
DEF

Said of [chemical species, for example] rocks and minerals, that are mechanically or chemically unstable ...

CONT

... a "labile sandstone" or "labile graywacke" containing abundant unstable fragments of rocks and minerals...

OBS

As opposed to "stabile."

OBS

labile: The term has loosely been used to describe either a relatively "unstable" and "transient" chemical species or (less commonly) a relatively stable but reactive species. It must therefore not be used without explanation of the intended meaning, and is best avoided altogether. [Related concepts:] inert, persistent, reactive, unreactive.

PHR

Labile salts.

French

Domaine(s)
  • Chimie analytique
DEF

Se dit de ce qui est fragile, peu stable (surtout en chimie [...])

OBS

labile : Terme flou pour qualifier soit une espèce chimique «transitoire» et «instable», soit moins couramment une espèce relativement «stable» mais «réactive». On ne doit donc pas l'utiliser sans explication sur le sens qu'on lui donne. [Notions apparentées :] inerte; non réactif; réactif; persistant.

PHR

Composé labile.

Spanish

Campo(s) temático(s)
  • Química analítica
DEF

Que tiene escasa constancia o consistencia y desaparece pronto.

Save record 4

Record 5 2005-01-11

English

Subject field(s)
  • Petrography
DEF

[A] consolidated sedimentary rock composed of sand-sized fragments irrespective of composition; e. g. sandstone, graywacke, arkose, and calcarenite.

CONT

The arenites are subdivided into quartz arenite (more than 95% quartz grains), arkosic arenite (more than 25% feldspar and more feldspar than rock fragments), subarkose arenite (5-25% feldspar grains and more feldspar than rock fragments), lithic arenite (more than 25% rock fragments and more rock fragments than feldspar), and sublitharenite (5-25% rock fragments and more rock fragments than feldspar).

CONT

The Mufulira copper deposit occurs in Proterozoic rocks ... Chalcopyrite is the principal sulphide mineral ... Fluviatile and aeolian arenites form the footwall rocks.

OBS

The term is equivalent to the Greek-derived term, psammite ...

French

Domaine(s)
  • Pétrographie
DEF

Roche détritique dont la majorité des grains est comprise entre 2 mm et 64 µm quelles qu'en soient l'origine et la composition minéralogique.

CONT

Suivant les dimensions croissantes des grains on distingue les lutites (argiles et silts), les arénites (sablons et sables) et les rudites (graviers, galets et blocs) [...]

Spanish

Campo(s) temático(s)
  • Petrografía
OBS

Nombre con que ciertos geólogos designan a toda arena no cuarzosa producida por alteración química o disgregación.

Save record 5

Record 6 2004-05-19

English

Subject field(s)
  • Chronology
  • Petrography
CONT

Lower Proterozoic graywacke.

CONT

The [Sudbury Igneous] Complex is overlain by the ... Early Proterozoic Whitewater Group ...

CONT

The early Proterozoic Thompson Nickel Belt of northern Manitoba.

French

Domaine(s)
  • Chronologie
  • Pétrographie
CONT

Grauwacke du Protérozoïque précoce.

CONT

Une accumulation sédimentaire du Protérozoïque précoce [...] connue sous le nom de Groupe de Whitewater, surmonte le Complexe igné de Sudbury [...]

OBS

La ceinture nickélifère de Thompson dans le nord du Manitoba remontant au Protérozoïque précoce.

Spanish

Save record 6

Record 7 1996-11-21

English

Subject field(s)
  • Petrography
  • Mineralogy
DEF

Graywacke that may be merely cataclastically deformed, or in which quartz and potassic feldspar have been recrystallized, albite porphyroblasts may be developed, and the clayey matrix has crystallized to form a fine-grained sericite-chlorite-magnetite aggregate.

Key term(s)
  • metagreywacke

French

Domaine(s)
  • Pétrographie
  • Minéralogie
CONT

District Alleghany (Californie) [...] Les faciès représentés, dans le secteur, sont des métagrauwackes, quartzites, schistes à biotite-hornblende. Les filons de quartz minéralisés se situent plus précisément dans ces roches métamorphiques et au contact de serpentines [...]

Spanish

Save record 7

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