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Allochem is a term introduced by Folk to describe the recognisable "grains" in carbonate rocks. Any fragment from around 0.5 mm upwards in size may be considered an allochem. Examples would include ooids, peloids, oncolites, pellets, fossil or pre-existing carbonate fragments. Fragments are still termed allochems if they have undergone chemical transformations – for example if an aragonite shell were to dissolve and be later replaced by calcite, the replacement would still be deemed an allochem. The allochems are typically embedded in a matrix of micrite (lime mud) or sparry calcite.

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  • Al·loquímic (ca)
  • Allochem (en)
  • Allochème (fr)
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  • Allochem is a term introduced by Folk to describe the recognisable "grains" in carbonate rocks. Any fragment from around 0.5 mm upwards in size may be considered an allochem. Examples would include ooids, peloids, oncolites, pellets, fossil or pre-existing carbonate fragments. Fragments are still termed allochems if they have undergone chemical transformations – for example if an aragonite shell were to dissolve and be later replaced by calcite, the replacement would still be deemed an allochem. The allochems are typically embedded in a matrix of micrite (lime mud) or sparry calcite. (en)
  • Allochème (allochem en anglais) est un terme d'origine anglo-saxone introduit par Folk pour décrire les grains reconnaissables dans des roches carbonatées. Le mot a été construit à partir du grec allos = autre, et de l'anglais chemical = chimie. (fr)
  • Al·loquímic (en anglès:Allochem) és un terme introduït per Folk per descriure els grans recognoscibles en les roques carbonatades. Qualsevol fragment d'una mida d'uns ½mm cap amunt, es pot considerar un al·loquímic. Els exemples inclouem ooides, peloides, oncòlits, pel·lets, fragments de fòssils o fragments preexistents de carbonat. Els fragments continuent dient-se al·loquímics si han experimentat transformacions químiques - per exemple en una closca d'aragonita substituïda més tard per calcita, la substitució continua sent un al·loquímic. (ca)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/OoidSurface01.jpg
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  • Al·loquímic (en anglès:Allochem) és un terme introduït per Folk per descriure els grans recognoscibles en les roques carbonatades. Qualsevol fragment d'una mida d'uns ½mm cap amunt, es pot considerar un al·loquímic. Els exemples inclouem ooides, peloides, oncòlits, pel·lets, fragments de fòssils o fragments preexistents de carbonat. Els fragments continuent dient-se al·loquímics si han experimentat transformacions químiques - per exemple en una closca d'aragonita substituïda més tard per calcita, la substitució continua sent un al·loquímic. Els al·loquímics típicament estan embeguts en una matriu geològica de micrita o calcita. (ca)
  • Allochem is a term introduced by Folk to describe the recognisable "grains" in carbonate rocks. Any fragment from around 0.5 mm upwards in size may be considered an allochem. Examples would include ooids, peloids, oncolites, pellets, fossil or pre-existing carbonate fragments. Fragments are still termed allochems if they have undergone chemical transformations – for example if an aragonite shell were to dissolve and be later replaced by calcite, the replacement would still be deemed an allochem. The allochems are typically embedded in a matrix of micrite (lime mud) or sparry calcite. (en)
  • Allochème (allochem en anglais) est un terme d'origine anglo-saxone introduit par Folk pour décrire les grains reconnaissables dans des roches carbonatées. Le mot a été construit à partir du grec allos = autre, et de l'anglais chemical = chimie. (fr)
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