GEO 303 Chapter Notes - Chapter 9: Gneiss, Mica, Muscovite
10 May 2016
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Document Summary
A rock that was once sedimentary or igneous that has transformed significantly enough to justify calling it a new rock. High pressure and high temperature are the factors that warrant a rock being metamorphic. Sheer stress: force that is applied to the rock along certain directions only. Role of water in metamorphism: during metamorphism, water is dissolved within the rock. High temperature is the chief ingredient: regional metamorphism: sheer stress, high pressure, and high temperature are all likely to be important here. Affects a very large areas in which rocks that formed near the surface have been brought down to great depth where they recrystallize, attaining equilibrium with the condition of the new environment. Ancient regional metamorphism: a classic study: isograds: mark zones of equal grade or intensity of metamorphism.
