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Metamorfiske bjergarter

Metamorfiske processer forekommer i bestemte omgivelser, hvor temperaturen og trykket når et vist niveau. Metamorfiske bjergarter dannes, hvis trykket overstiger 3 Kbar, og temperaturen er højere end 200°C. Sådanne omgivelser findes dybt inde i jorden, f.eks ved vulkanske arker, kollisions bjergkæder og stabile kontinenter. Kontakt-metamorfose forekommer ved lavt tryk og høj temperatur, hvilket kan ske lige ved siden af en intrusion, der opvarmer den omkringliggende bjergart. Disse forandringer danner bestemte bjergartstyper med et bestemt mineralindehold, der er afhængigt af protolitten, temperaturen og trykket.

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