Noun
The state or quality of being metamorphic; the process by which the material of rock masses has been more or less recrystallized by heat, pressure, etc., as in the change of sedimentary limestone to marble.
Source: Webster's dictionaryA diagram of folds, indicating an anticline and a syncline Even higher pressures and temperatures during horizontal shortening can cause both folding and metamorphism of the rocks. Source: Internet
Alteration of basalt Metamorphism Basalt structures in Namibia Basalts are important rocks within metamorphic belts, as they can provide vital information on the conditions of metamorphism within the belt. Source: Internet
A subgroup is the andalusite -, staurolite -, kyanite - and sillimanite -schists which usually make their appearance in the vicinity of gneissose granites, and have presumably been affected by contact metamorphism. Source: Internet
Around the igneous rock that forms from the cooling magma is a metamorphosed zone called a contact metamorphism aureole. Source: Internet
Folding and metamorphism Remains of the ancient Servian Walls in Rome, made of tuff blocks In course of time, other changes than weathering may overtake tuff deposits. Source: Internet
Another important mechanism of metamorphism is that of chemical reactions that occur between minerals without them melting. Source: Internet