Protolit

En protolit er den oprindelige bjergart, der sidenhen bliver udsat for metamorfose og dermed bliver udsat for forandringer i omgivelserne. Hvis protolitten er en basalt, så vil den blive omdannet til følgende bjergarter ved stigende tryk og temperatur i en kontinental skorpe, hvor den følger den normale geotermiske gradient (den oliven grønne pil): Grønskiffer, Amfibolit, Mafisk Granulit (Figur 1). Grønskiffer er den første omdannelse, der finder sted og sker derfor i pilens øvre del, lige efter diagenesen. Til sidst, ved meget højt tryk og temperatur omdannes bjergarten til en mafisk granulit.

Figur 1: Tryk-Temperatur diagrammet viser bjergarters omdannelse på grund af metamorfose. Figuren er modificeret fra Understanding Earth 1994 W. H. Freeman and Company.

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