The Government of Canada’s terminology and linguistic data bank.

BASIC FRONT [1 record]

Record 1 2011-09-09


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

A zone enriched in basic constituents which are expelled from country rocks undergoing granitization.


The introduced elements (mainly iron and magnesium but commonly including aluminum, calcium, potassium, hydrogen, titanium, phosphorus, and manganese) are those that are either incompatible with a granite composition or in excess of the appropriate amounts.


mafic front: The preferred term of some petrologists.


  • Géochimie
  • Érosion et corrosion (Géologie)

Zone enrichie de constituants basiques (calcium, magnésium et fer), expulsés des roches pendant leur granitisation.


[...] une roche granitique [...] peut se former par remplacement de roches très variées, mais elle [...] refoule en dehors du front de granitisation les éléments chimiques qu'elle n'accepte pas. Ainsi prennent naissance : les concentrations mélanocrates (fronts basiques), les gîtes pyrométasomatiques, les concentrations d'étain [...]


[...] le granite expulse les éléments du groupe de l'étain et les «concentre» autour de lui (idée identique à celle des «fronts basiques»).


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