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BIOCHEMICAL ROCK [1 record]

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Record 1 1992-07-22

English

Subject field(s)
  • Petrography
  • Geochemistry
DEF

A sedimentary rock characterized by or resulting directly or indirectly from, the chemical processes and activities of living organisms; e.g. bacterial iron ores and certain limestones.

French

Domaine(s)
  • Pétrographie
  • Géochimie
CONT

Roches biochimiques. Le support de ces roches est de nature diverse : siliceuse, carbonatée, ferrugineuse, carbonée. L'intérêt de ces faciès biochimiques n'est plus à démontrer : gisements de phosphate; gisements des édifices récifaux, notamment plomb, zinc, cuivre; gisements associés à des roches carbonées : Kupferschiefer d'Allemagne (à cuivre, plomb, zinc), mines d'or et uranium du Rand en Afrique du Sud, uranium lié à des débris organiques au Colorado.

Spanish

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