frange d'altération

15:05 May 21, 2018
This question was closed without grading. Reason: Other

French to English translations [PRO]
Tech/Engineering - Geology / étude géotechnique
French term or phrase: frange d'altération
Ces terrains sont généralement de bonne compacité mais présentent généralement une frange d’altération
en tête au contact des Alluvions
Local time: 15:01

Summary of answers provided
3deformation belt/strip
liz askew
2altered fringe
Claire N.

Discussion entries: 1



14 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
frange d\'altération
deformation belt/strip

89. Figure 4.1.C : Hydrogramme de crue proposé par Roche International. ...... importantes et sont localisés dans la frange d'altération des roches cristallines.

Note added at 21 mins (2018-05-21 15:27:38 GMT)

or strata
S. M. MATHUR - 2001 - ‎Science
They are produced by deformation of strata, and in some cases of crystalline rocks. Sometimes, gross structures may not be clear on the ground and may require ...

liz askew
United Kingdom
Local time: 14:01
Native speaker of: Native in EnglishEnglish
PRO pts in category: 26

Peer comments on this answer (and responses from the answerer)
neutral  philgoddard: How do we know it's deformation? Couldn't it be geochemical alteration, for example?
9 mins
  -> because it says nothing about "geochemical" in the source document.
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5 days   confidence: Answerer confidence 2/5Answerer confidence 2/5
altered fringe

"altération" can be translated as "alteration":ération_(géologie)

n géologie, l'altération est l'ensemble des modifications des propriétés physico-chimiques des minéraux, et donc des roches, par les agents atmosphériques (altération météorique), par les eaux souterraines (altération de subsurface) et les eaux thermales (altération hydrothermale). Elle dépend en particulier du climat, de la température des eaux, de la nature des roches et de leur degré de fracturation

Mineral alteration refers to the various natural processes that alter a mineral's chemical composition or crystallography. [1]

Mineral alteration is essentially governed by the laws of thermodynamics related to energy conservation, relevant to environmental conditions, often in presence of catalysts, the most common and influential being water (H2O).

For the "frange" part, it can be translated as "fringe", specifically when referring to the "frange capillaire/capillary fringe", which is a layer.

Here is an example of the use of "atered fringe":

"developed over the sericite-pyrite altered fringe"

Another example:

Sampling was along a 1-km transect perpendicular to the alteration zones extending from the potassically altered core to the propylitically altered fringe of the system.

Also see the following refereces to "alteration zone" or "zone of alteration" in the field of geology:

See examples in this document:

Blanket-like carbonate- bearing ALTERATION ZONES in the upper part of some geothermal/epithermal systems may reflect the condensation of gases (CO2) from deeper boiling zones.

and as the upper or outer ALTERATION ZONES associated with intrusion- related skarn/sulphide replacement bodies.

Albite alteration is generally distributed along fracture and vein envelopes, typically becoming more pervasive toward the centre of the ZONE OF ALTERATION, where it may form a dense massive rock.

Claire N.
Local time: 09:01
Native speaker of: English
PRO pts in category: 8
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