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Diagenese
Diagenese sker forud for metamorfose. Det sker ved temperature lavere end 200°C og tryk lavere end 3 Kbar, hvilket også kaldes en lav-tryk, lav-temperatur forandringsproces. Processen involverer både kemiske og fysiske forandringer via kompaktion og cementering osv. Et eksempel er feldspat, der under diagenese omdannes til lermineraler. Generelt medfører diagenese konsolidering af sedimenter.
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