Earth Sciences 1070A/B Lecture Notes - Lecture 6: Metamorphic Rock, Staurolite, Muscovite
21 Mar 2017
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Document Summary
Chemical composition of a metamorphic rock largely reflects that of its parent rock, the texture and make up depends on the physical processes involved. Basically burial metamorphism but at much greater depths, 400* - 800*. The thermal aureole or zone of recrystallized rock surrounding the igneous body is rock that experienced higher temperatures and as a result recrystallized. Limestone to marble, sandstone to quartizite, shale to a hornfels. Foliation new minerals are formed and tend to be elongated along direction of least stress, i. e. greatest stress in east-west, minerals will grow preferentially in north south. Zeolite facies shallow burial, low temps, mostly textural changes, few mineralogical. Greenschist facies increased depth, mineral changes occur with recrystallization of low temp minerals such as those containing water (i. e. chlorite are green) Amphibolie facies increased temp and pressure, larger volumes of water squeezed out, minerals recrystallize to higher temp stable forms.
