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ALGOMAN-TYPE IRON FORMATION [1 record]

Record 1 2006-06-06

English

Subject field(s)
  • Gold and Silver Mining
  • Petrography
  • Iron and Manganese Mining
DEF

Chemically precipitated iron formation composed of thinly banded chert and iron minerals with associated volcanic rocks and graywackes.

CONT

Algoma type. This type is characteristic of the Archaean greenstone belts where it finds its most widespread development. It also occurs ... in younger rocks including the Phanerozoic. It shows a greywacke-volcanic association suggesting a geosynclinal environment. The oxide, carbonate and sulphide facies are present, with iron silicates often appearing in the carbonate facies. Algoma-type BIF [banded iron formation] generally ranges from a few centimetres to a hundred or so metres in thickness ...

CONT

Significant gold in non-stratiform type deposits is associated with sulphide-rich Algoma-type BIF that occurs in either sediment- or volcanic-dominated portions of greenstone belt terrains.

OBS

[This type of iron-formation] is found along volcanic arcs, chiefly Archean in age ...

French

Domaine(s)
  • Mines d'or et d'argent
  • Pétrographie
  • Mines de fer et de manganèse
CONT

La formation ferrifère du type Algoma a été déposée avec des roches volcaniques et sédimentaires caractéristiques du milieu eugéosynclinal [...] Les formations du type Algoma ont une épaisseur allant de quelques pouces à plus de 100 pieds [...]

CONT

Les formations ferrifères stratifiées du type Algoma s'étendent généralement dans les zones volcano-sédimentaires. Les parties les plus étendues et les plus riches de ces formations peuvent constituer des massifs de minerai.

CONT

Presque toutes les zones de roches volcaniques et sédimentaires dans les provinces tectoniques du lac Supérieur et de Churchill contiennent quelques formations de fer du type «Algoma».

Spanish

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