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Diagenese (geologi)

Diagenese er omdannelse av løse sedimenter til faste bergarter. F.eks. sand til sandstein. Diagenese brukes både om hele prosessen, og om stadiet som skjer før metamorfose. Det innebærer både kjemiske og fysiske endringer. Flere forskjellige mineraler kan omdannes innenfor en stein, og sammensetningen er med på å skille dem som bergarter. Et eksempel er at diagenese av feltspat har innslag av leirmineral.

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