GEOL 256 Lecture Notes - Lecture 26: Convergent Boundary, Metamorphic Rock, Overburden Pressure
13 Nov 2020
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Document Summary
Mineral, chemical and physical changes that occur in the solid state. Intermediate pressures and temperatures sedimentary diagenesis > metamorphism < igneous melt generation. Minerals become unstable, chemical reactions occur and new minerals form. Carries new dissolved elements into/out of rocks. Carry dissolved ions in and out of rocks. Hot fluids can also increase temperature in the rock. Causes much of the high pressures and temperatures and fluid migration in crust. Original sedimentary, igneous, or metamorphic rock before metamorphism. Original minerals unstable due to temperature and pressure. New dissolved ions can be brought in by fluids. Amphibole, quartz, plagioclase, pyroxene, garnet, sillimanite, little to no mica. Facies: a collection of minerals that are stable. Compression and shear, thickening of crust increases heat and pressure. Minerals: chlorite, epidote muscovite, biotite, actinolite, serpentine. Minerals: quartz and feldspar increase, hornblende, garnet muscovite, biotite, staurolite, kyanite. Minerals: quartz and feldspar increase, pyroxene, garnet, hornblende, sillimanite.
