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Diagenesi

Diagenesi avviene prima del metamorfismo. Accade a temperature inferiori a 200 ° C e a pressioni inferiori a 3 Kbar, si tratta quindi di un processo di alterazione a basse temperature e pressioni. Il processo prevede cambiamenti chimici e fisici per compattazione, cementazione ecc. Poiché esistono diversi minerali all’interno di una roccia, l’effetto sarà diverso sui diversi tipi di roccia. Per esempio, la diagenesi del feldspato lo trasformerà in argilla minerale. In generale i cambiamenti diagenetici della roccia o dei sedimenti si verificano tra la deposizione e consolidamento.

 

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