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CARBONATE FORMATION [2 records]

Record 1 2001-04-25

English

Subject field(s)
  • Geochemistry
  • Petrography
CONT

These [manganiferous] deposits ... are basically minor manganese-rich divisions of larger non-ore carbonate formations. ... Usually the succession contains three distinct units: (a) a lower terrigenous, often red bed, unit; (b) the ore-bearing unit, dominantly a carbonate formation with subordinate red clay and sometimes gypsum; (c) an upper terrigenous unit, again often red.

French

Domaine(s)
  • Géochimie
  • Pétrographie
CONT

[...] un gîte [...] se trouve dans une formation carbonatée ou gréseuse, etc.

Spanish

Save record 1

Record 2 2001-04-25

English

Subject field(s)
  • Geochemistry
  • Metals Mining
DEF

An iron formation characterized by alternating laminae of chert and iron-rich carbonate minerals ...

OBS

Banded iron formation is characterized by its fine layering. ... The simplest and commonest BIF consists of alternating hematite and chert layers. ... James (1954) identified four important facies of BIF. (a) Oxide facies. ... (b) Carbonate facies. ... (c) Silicate facies. ... (d) Sulphide facies.

French

Domaine(s)
  • Géochimie
  • Mines métalliques
OBS

Diagramme montrant les principaux types de formations ferrifères résultant d'une précipitation chimique; on donne aussi le faciès de sédimentation [...]. Faciès oxyde. Faciès silicate. Faciès carbonate. Faciès sulfure.

CONT

Les B.I.F. oxydés et carbonatés sont fréquents.

OBS

Voir fiches «formation ferrifère rubanée» et «faciès carbonaté».

Spanish

Save record 2

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