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ALLOCHEM [1 record]

Record 1 2001-06-13

English

Subject field(s)
  • Petrography
  • Geochemistry
DEF

... one of several varieties of discrete and organized carbonate aggregates that serve as the coarser framework grains in most mechanically deposited limestones, as distinguished from sparry calcite and carbonate-mud matrix.

CONT

In carbonate sands ..., grains are produced chemically or biochemically "within" the basin of accumulation. They are "intrabasinal" in origin. To these grains Folk ... has applied the term "allochems."

CONT

Important allochems include: silt-, sand-, and gravel-size intraclasts; ooliths; pellets; lumps; and fossils or fossil fragments.

French

Domaine(s)
  • Pétrographie
  • Géochimie
DEF

Sédiment formé par les précipitations chimiques ou biochimiques d'éléments transportés, dans un bassin de sédimentation.

DEF

[...] éléments figurés [dans un calcaire] : débris microbréchiques (intraclastes), débris coquilliers (bioclastes), gravelles, pelotes (pellets), oolites, coprolites et agrégats (lumps).

Spanish

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