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METASOMATOSE [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2007-10-23

English

Subject field(s)
  • Geochemistry
  • Erosion and Weathering (Geol.)
DEF

The process of practically simultaneous capillary solution and deposition by which a new mineral may grow in the body of an old mineral or mineral aggregate.

CONT

Metasomatism, or replacement, is the process of essentially simultaneous removal and deposition of chemical matter. A striking manifestation of this process in mineral deposits is the replacement of one mineral by another mineral ... of partly or wholly different composition. A large volume of rock may be transformed ..., and the resulting deposit is generally of equal volume.

CONT

... columbite may have formed by metasomatism of pyrochlore (replacement of calcium in pyrochlore by iron ...).

OBS

Compare with the term "replacement" (see record) that has a more general meaning.

OBS

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

French

Domaine(s)
  • Géochimie
  • Érosion et corrosion (Géologie)
DEF

Métamorphisme qui s'accompagne d'une modification de la composition chimique globale des roches originelles par la substitution d'un solide minéral par un autre au sein de cette même roche.

CONT

Les processus métasomatiques ont lieu dans des conditions de température et de pression très variables. Ils peuvent s'accompagner de modifications de volume, mais, très souvent, les substitutions ont lieu sans changement de volume [...]

CONT

Dans la métasomatose, les nouveaux minéraux se substituent aux anciens sans que leurs formes extérieures en soient modifiées. Les cas les plus fréquents sont la dolomitisation des calcaires et les silicifications [...]

OBS

La notion de variation chimique tend à se substituer à celle d'apport magmatique dont la réalité n'a jamais été démontrée. Plutôt que d'apports, il s'agit d'échanges d'éléments, de remplacement d'une molécule, d'un atome ou d'un ion par un autre, définition même de la métasomatose.

OBS

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

Spanish

Campo(s) temático(s)
  • Geoquímica
  • Erosión y corrosión (Geología)
DEF

Proceso de transformación de una roca consistente en el reemplazamiento de uno de sus minerales por otro llamado mineral de substitución.

Save record 1

Record 2 2005-08-08

English

Subject field(s)
  • Erosion and Weathering (Geol.)
  • Geochemistry
CONT

The mineralization was associated with retrograde metamorphism, which resulted in ... argillic alteration ... The argillic alteration was superimposed on preceding lateritization ... Tourmalinization and magnesian metasomatism were common companions of these processes.

French

Domaine(s)
  • Érosion et corrosion (Géologie)
  • Géochimie
CONT

[...] les skarns magnésiens dériveraient des skarns calciques par «métasomatose magnésienne» [...]

Spanish

Save record 2

Record 3 2005-03-07

English

Subject field(s)
  • Geochemistry
  • Erosion and Weathering (Geol.)
DEF

A mass change in the composition of rocks in contact with an invading magma from which fluid constituents are carried out to combine with some of the country-rock constituents to form a new suite of minerals.

CONT

Intrusion of the diabase sheets was accompanied by contact metasomatic alteration of the country rocks ...

French

Domaine(s)
  • Géochimie
  • Érosion et corrosion (Géologie)
DEF

Modification chimique d'une roche envahie par une intrusion magmatique.

CONT

L'intrusion des feuillets de diabase a été accompagnée d'un métasomatisme de contact des roches encaissantes [...]

Spanish

Save record 3

Record 4 2004-03-09

English

Subject field(s)
  • Metals Mining
  • Economic Geology
  • Geochemistry
CONT

Metasomatic deposits ... commonly are superimposed on older rocks of the intrusive complex by continuing igneous activity or fluid transport of elements of economic interest (among other); may be crosscutting with respect to intrusive units; and commonly have associated alteration which may be a guide to ore.

CONT

Metasomatic deposits ... occur in alkalic igneous rocks or surrounding country rocks, with mineralization superimposed on pre-existing rocks. The principal commodities recoverable from deposits of this type are niobium, tantalum, beryllium, yttrium, rare earths, gallium, uranium, thorium, and zirconium. Normally only one or two commodities carry the deposit economically, with others if recovered, as byproducts. The principal Canadian example is the Highwood Resources deposit at Thor Lake, NWT ...

CONT

... metasomatic deposits form by the reaction of fluids released during crystallization with pre-existing carbonatite or country rocks.

French

Domaine(s)
  • Mines métalliques
  • Géologie économique
  • Géochimie
CONT

[...] les gîtes métasomatiques proviennent de la réaction de fluides libérés au cours de la cristallisation avec des carbonatites de formation antérieure ou avec les roches encaissantes.

CONT

Phlogopite. [...] Mica fréquent des gîtes métasomatiques de contact [...]

OBS

Le terme «gisement de substitution» est [...] plus large que celui de «gisement par métasomatose», puisqu'il peut couvrir des mécanismes par précipitation, analogues à ceux des remplissages de vides filoniens.

Key term(s)
  • gîte par métasomatose

Spanish

Campo(s) temático(s)
  • Minas metálicas
  • Geología económica
  • Geoquímica
Save record 4

Record 5 2001-03-15

English

Subject field(s)
  • Erosion and Weathering (Geol.)
  • Geochemistry
CONT

Carbonatization of silicate rocks involves ... anion metasomatism ...

OBS

As opposed to "cation metasomatism."

French

Domaine(s)
  • Érosion et corrosion (Géologie)
  • Géochimie

Spanish

Save record 5

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