TERMIUM Plus®

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SILICIFICATION [1 record]

Record 1 2004-07-12

English

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

The introduction of, or replacement by, silica, generally resulting in the formation of fine-grained quartz, chalcedony, or opal, which may both fill pores and replace existing minerals.

CONT

In the course of wall rock alteration and skarn development, the hydrothermal solutions react most extensively with the carbonate rocks, resulting in an increase in their pH, silicification of the wall rock ...

OBS

The term covers all varieties of such processes as late diagenetic.

French

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

Remplacement total ou partiel des roches et des fossiles par la silice (sous forme de quartz, de calcédoine, etc.).

CONT

Cette mobilité de la silice est caractéristique de ces climats hydrolysants. Ceci entraîne la formation de croûtes ou nodules siliceux à quelques mètres de la surface. Il existe aussi des dalles de quartzite à la surface du sidérolithique; ici se situe une silicification en table [...]

CONT

Durant l'altération des roches encaissantes et la skarnification, les solutions hydrothermales réagissent préférentiellement avec les roches carbonatées, ce qui entraîne une augmentation de leur pH, une silicification des roches encaissantes [...]

Spanish

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