https://www.pairform.fr/doc/17/138/463/web/res/5_1-2.png
Une roche métamorphique est un type de roches dont la formation a pour origine la transformation à l'état solide des roches sédimentaires, magmatiques ou encore métamorphiques, en raison des modifications des paramètres physico-chimiques du milieu dans lequel elles évoluent (notamment la pression et la température). Cette transformation, désignée sous le terme de métamorphisme, se traduit par une modification de la texture, de l'assemblage minéralogique à l'équilibre ou de la composition chimique de la roche. La roche originelle d'une roche métamorphique est appelée le protolithe.
https://viagallica.com/auvergne/img/roches_metamorphiques_005_(tableau_sequence).gif
http://www.ahhhlessciences.com/Science%20et%20technologie%20I/Compl%C3%A9ment%20au%20cours/La%20Terre/Les%20roches/Photos%20de%20roches/Gneiss%20-%20Lac%20Gagnon%20(03).jpg
les roches métamorphiques
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