Classifications de Folk
- Classifications de Folk
-
Classification de Folk
La classification de Folk concerne les roches carbonatées (ou calcaires), il essaie de nommer ces roches en observant différentes caractéristiques: Il existe une autre classification pour ces calcaires: la classification de Dunham
La classification
Allochems :
- Intraclastes : fragments de roches (gros fragment anguleux)
- Ooïdes : structure sphérique avec des oolithes et/ou pisolithes .
- Bioclastes : correspond aux fossiles
- Pelloïdes : structure ovoïdes.(déjection animale, pellote alguaire, ooïdes micritisés)
Orthochems : phase de liaison reliant les grains entre eux
Exemples
Ainsi imaginons un calcaire contenant des contenants des oolithes (préfixe: oo-) et ayant une phase de liaison cristalline, nous avons donc une oosparite.
Un autre exemple un calcaire possédant des fossiles donc des bioclastes (préfixe bio-) et ayant une phase de liaison très fine microcristalline : Nous avons une biomicrite.
Liens internes
Portail des minéraux et roches
Catégorie : Roche sédimentaire
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Contenu soumis à la licence CC-BY-SA. Source : Article Classifications de Folk de Wikipédia en français (auteurs)
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Oosparite
