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TUFFEAU [4 records]

Record 1 1998-07-16

English

Subject field(s)
  • Geology
DEF

A grayish marly rock rich in chalk and containing up to 30% clayey material;...

CONT

The location of the tunnels 40 m under the sea bed makes use of geological strata which are favourable for the tunnelling operations. The UK drives are mostly in fairly impermeable chalk marl. Their TBM's (Tunnel Boring Machine) are open face.

French

Domaine(s)
  • Géologie
CONT

[...] la couche de craie bleue descend sous la côte, et les tunnels se trouvent dans des couches géologiques très perméables.

Spanish

Save record 1

Record 2 1995-12-07

English

Subject field(s)
  • Mineralogy
OBS

See "marly" and "chalk."

French

Domaine(s)
  • Minéralogie
CONT

[La craie] se présente sous différents aspects [...] "Craie marneuse", jaunâtre(mélangée d’argile) ou tuffeau en Touraine.

Spanish

Save record 2

Record 3 1977-05-06

English

Subject field(s)
  • Chemical Engineering
  • Geology
OBS

A term used in France for tufa, micaceous chalk, and soft, very porous, extremely coarse limestone made up of bryozoan fragments.

French

Domaine(s)
  • Génie chimique
  • Géologie
OBS

Variété de craie en Touraine, à gros éléments, tendre, friable, poreuse, avec beaucoup de débris de coquilles; elle appartient au Crétacé supérieur; faiblement agglomérée, elle est riche en quartz et mica enrobés de [carbonate de calcium] amorphe. Dans le Nord de la France, c’est un calcaire qui tirerait son nom de son étouffé et sourd produit par le marteau quand on le brise.

Spanish

Save record 3

Record 4 1976-06-19

English

Subject field(s)
  • Geology

French

Domaine(s)
  • Géologie

Spanish

Save record 4

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