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FRACTIONAL CRYSTALLIZATION [10 records]

Record 1 2011-07-22

English

Subject field(s)
  • Geochemistry
  • Petrography
  • Mineralogy
DEF

[The] crystallization from a magma in which the early-formed crystals are prevented from equilibrating with the parent liquid, resulting in a series of residual liquids of more extreme composition than would have resulted from continuous reaction.

CONT

Those [deposits] formed by fractional crystallization are usually found in plutonic igneous rocks...

OBS

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

PHR

Assimilation and fractional crystallization.

French

Domaine(s)
  • Géochimie
  • Pétrographie
  • Minéralogie
DEF

Processus de cristallisation de différents minéraux à des moments successifs dans un magma en refroidissement, se traduisant par une série de réactions chimiques complexes.

CONT

Les gîtes stratiformes de chromite se sont manifestement formés au cours de la cristallisation fractionnée de magmas mafiques ou ultramafiques.

OBS

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

PHR

Processus d'assimilation et de cristallisation fractionnée.

Spanish

Campo(s) temático(s)
  • Geoquímica
  • Petrografía
  • Mineralogía
Save record 1

Record 2 2009-05-25

English

Subject field(s)
  • Geochemistry
  • Petrography
  • Mineralogy
CONT

Most arc lavas have experienced significant assimilation and fractional crystallization(AFC) during magma evolution. Although AFC processes can fundamentally change trace element and isotopic features of magma, its effect on U[ uranium]-series disequilibria has not been rigorously investigated despite its importance.

OBS

AFC: abbreviation used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Géochimie
  • Pétrographie
  • Minéralogie
CONT

Les processus d'assimilation et de cristallisation fractionnée se sont manifestés à divers degrés dans la croûte et, dans certains cas, ont produit des icelandites, quelques petits volumes de rhyolites et des granophyres, avec les compositions en Nd [néodyme] dominées par les matériaux du manteau.

OBS

processus d'assimilation et de cristallisation fractionnée : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 2

Record 3 2006-11-15

English

Subject field(s)
  • Petrography
CONT

The lherzolite-bearing flows have relatively low Mg numbers and are the result of low degrees of partial melting followed by fractional crystallization in the upper mantle.

OBS

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

French

Domaine(s)
  • Pétrographie
CONT

[...] l'on retrouve de par le monde, en gros, deux types d'ophiolites : Les ophiolites à section crustale épaisse, continue (gabbros épais) et à harzburgite (olivine + Orthopyroxène) [...]. À l'opposé [...], les ophiolites à section crustale réduite (épaisseur réduite des gabbros) discontinue et à lherzolite (olivine + orthopyroxène + clinopyroxène) [...]

OBS

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

Spanish

Save record 3

Record 4 2003-11-17

English

Subject field(s)
  • Mineralogy
CONT

The occurrence of chromitites in which chromite is the only cumulus mineral is problematic because chromite is not expected to be the sole liquidus phase during the normal course of fractional crystallization of mafic or ultramafic magma.

French

Domaine(s)
  • Minéralogie
CONT

L'existence de chromitites dans lesquelles la chromite constitue l'unique minéral de la phase cumulus est problématique parce qu'on ne s'attendrait pas à ce que la chromite soit la seule phase à atteindre le liquidus au cours d'un processus normal de cristallisation fractionnée d'un magma mafique ou ultramafique.

Spanish

Save record 4

Record 5 2003-11-17

English

Subject field(s)
  • Mineralogy
CONT

The occurrence of chromitites in which chromite is the only cumulus mineral is problematic because chromite is not expected to be the sole liquidus phase during the normal course of fractional crystallization of mafic or ultramafic magma.

French

Domaine(s)
  • Minéralogie
CONT

L'existence de chromitites dans lesquelles la chromite constitue l'unique minéral de la phase cumulus est problématique parce qu'on ne s'attendrait pas à ce que la chromite soit la seule phase à atteindre le liquidus au cours d'un processus normal de cristallisation fractionnée d'un magma mafique ou ultramafique.

Spanish

Save record 5

Record 6 2003-10-27

English

Subject field(s)
  • Geochemistry
  • Petrography
CONT

Differentiation on cooling of a mafic magma ... would enable separation of plagioclase of the composition found in anorthosite masses and the gradual enrichment of the remaining magma in ferromagnesian, alkali, and volatile constituents ...

CONT

Stratiform chromite deposits clearly formed by the fractional crystallization of mafic or ultramafic magmas.

French

Domaine(s)
  • Géochimie
  • Pétrographie
DEF

Magma riche en magnésium et en fer.

CONT

Les gîtes stratiformes de chromite se sont manifestement formés au cours de la cristallisation fractionnée de magmas mafiques ou ultramafiques.

Spanish

Save record 6

Record 7 2003-08-29

English

Subject field(s)
  • Petrography
  • Geochemistry
CONT

Stratiform chromite deposits clearly formed by the fractional crystallization of mafic or ultramafic magmas.

French

Domaine(s)
  • Pétrographie
  • Géochimie
CONT

Les gîtes stratiformes de chromite se sont manifestement formés au cours de la cristallisation fractionnée de magmas mafiques ou ultramafiques.

Spanish

Save record 7

Record 8 2001-06-06

English

Subject field(s)
  • Geochemistry
  • Geophysics
DEF

Referring to conditions of pressure, temperature, and composition under which two or more solid phases crystallize at the same time, with no resorption, from a single liquid over a finite range of decreasing temperature.

CONT

If the growth rate for plagioclase were much greater, this mineral could crystallize almost completely before the pyroxene substantially developed. Such a phenomenon could not develop under equilibrium conditions where cotectic(simultaneous) crystallization of both phases would occur at a very early stage.... The observation that [the ophitic] texture is normally absent in coarser gabbros of the same composition that have cooled very slowly supports this hypothesis, as does the fact that it is pyroxene rather than plagioclase that is generally observed to have separated prior to cotectic precipitation during fractional crystallization of differentiated tholeiitic sills...

French

Domaine(s)
  • Géochimie
  • Géophysique
PHR

Courbe cotectique, cristallisation cotectique, surface cotectique.

Spanish

Save record 8

Record 9 1999-04-14

English

Subject field(s)
  • Geology
DEF

A process of magmatic differentiation wherein a magma, having crystallized to a mush of interlocking crystals in liquid, is compressed by Earth movements and the liquid moves toward regions of lower pressure, thus becoming separated from the crystals.

CONT

Fractional crystallization... includes any mechanical process by which early-formed crystals are prevented from equilibrating with the melt from which they grew. The important processes are gravity fractionation, flowage differentiation, filter pressing and dilatation...

French

Domaine(s)
  • Géologie
CONT

Les liquides subsistant à la suite de l'élimination d'une proportion plus ou moins grande de tels ou tels cristaux, à un stade plus ou moins tardif de l'évolution, pourront [...] avoir des compositions diverses à partir d'un même liquide initial. On dira qu'ils se sont différenciés à partir de ce liquide. Les processus les plus usuels de telles séparations sont la décantation de minéraux lourds, ou bien l'effet de «filtre-presse» qui élimine sous l'influence de pressions tectoniques le liquide d'un agrégat de cristaux imprégnés par ce liquide.

Spanish

Save record 9

Record 10 1992-08-05

English

Subject field(s)
  • Geology
  • Petrography
CONT

As the end product of igneous evolution, possibly fractional crystallization, the Strange Lake deposits may be compared to the Mountain Pass evolved carbonatite....

French

Domaine(s)
  • Géologie
  • Pétrographie
CONT

Cette notion de granite, terme ultime du métamorphisme, a été confortée par l'anatexie expérimentale (...)

Spanish

Save record 10

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