GLGY 209 Lecture Notes - Lecture 10: Metamorphic Rock, Migmatite, Metamorphism
4 May 2019
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Document Summary
Changes of the preexisting rocks during the metamorphic process are. Most cases are both textural and mineralogical. The changes during the metamorphic process is due to the fact that the rocks have the trend to remain in equilibrium with the surrounding environment. The metamorphic changes are made while the rocks remain under the solid state this doesn"t always happen e. g. migmatite. If process of burial continues mineral transformed because of close melting point. Minerals start moving in the mass, impression of folds but are minerals at high pressure. Migmatite half way between igneous and metamorphic. Example of metamorphism the transformation from a limestone into a marble involves rock recrystallization. Shallow waters limestone will present fossils because of the number of organisms in shall water. Metamorphic rocks exposed at the earth"s surface provide a window into different levels into the earth"s crust. gives clue of what happens in the earth"s interior.
