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PINCH SWELL STRUCTURE [1 record]

Record 1 2011-02-03

English

Subject field(s)
  • Tectonics
  • Various Metal Ores
DEF

A structural condition common in pegmatites and veins of quartz in metamorphosed rocks.

CONT

Veins frequently pinch and swell out as they are followed up or down a stratigraphic sequence ... This pinch-and-swell structure can create difficulties during both exploration and mining.

CONT

... with partial burial the evaporites usually dominated by salt, may develop pinch-and-swell structures and rolls ("salt anticlines") from tabular beds.

OBS

[In this type of structure,] the vein is pinched at frequent intervals, leaving expanded parts between.

OBS

pinch and swell structure: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Tectonique
  • Minerais divers (Mines métalliques)
CONT

[...] si l'enfouissement se poursuit, les évaporites originales formant des couches tabulaires surtout composées de sel peuvent se transformer en structures à boudins et étranglements et en rouleaux (anticlinaux salifères).

OBS

Un filon peut se resserrer jusqu'à avoir moins d'un centimètre d'épaisseur, et n'apparaître ainsi, dans une galerie, que comme un simple fil (d'où le nom de «filon»), qu'on suit dans l'espoir qu'il se rouvrira plus loin.

OBS

structure à boudins et étranglements : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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