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LEUCOCRATIC TONALITE [2 records]

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Alphabetical list of terms

Record 1 2006-11-15

English

Subject field(s)
  • Petrography
CONT

Leucocratic tonalite-Forms local elongate masses of white rock composed of plagioclase... and quartz; appear to be very large-scale schlieren. Leucocratic tonalite texturally similar to tonalite forming main part of Lakeview Mountains pluton, except for absence of mafic minerals and slightly smaller grain-size. Extremely poikilitic biotite and hornblende locally present in very small amounts. Rare interstitial white mica found in some plagioclase.

OBS

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

French

Domaine(s)
  • Pétrographie
OBS

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

Spanish

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Record 2 2006-11-15

English

Subject field(s)
  • Petrography
CONT

Model 1 starts with an average modified Bell Island leucotonalite melt coexisting with two pyroxenes, two Fe-Ti oxides, and plagioclase at the beginning of hydration crystallization.

OBS

According to mineral and chemical compositions two types of basic granulites are recognized :leucocratic, close in contents of major and trace elements to low-titanium tholeiitic basalts, and melanocratic, depleted in SiO2, Na2O, Rb, Ba, Sr, and LREE and enriched in Fe2O3, Ti, Nb, HREE, Y, and Sc(compared with the leucocratic granulites) and compositionally similar to restite equilibrated with tonalite melt.

OBS

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

French

Domaine(s)
  • Pétrographie
OBS

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

Spanish

Save record 2

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