TERM 1
Metamorphism
DEFINITION 1
Metamorphism: Change in form of a proto-lith due to
increase in pressure and temperatureAs metamorphism
increases, so does grain sizeComplete metamorphism takes
a million years!Common rocks: slate, phyllite, schist, gneiss
TERM 2
Contact metamorphism
DEFINITION 2
Contact metamorphism: High temperatures, low
pressureWhere?Forms along subduction plate
boundariesTexture- Recrystallization of minerals to
interlocking, monominerallic textureQuartz sandstone +
contact metamorphism = quartziteLimestone with calcite +
contact metamorphism = marble
TERM 3
Regional metamorphism
DEFINITION 3
Regional metamorphism : Highest temperatures, high
pressureWhere?Forms along subduction boundaries with
greatest temp. & pressure TextureFoliatedShale + regional
metamorphism =Slate,Phyllite,Schist,Gneiss
TERM 4
Geologic units
DEFINITION 4
Rocks or sediments that ahve been mapped at a 1:24000
scale (7.5 minte topographic quadrangle) because of similar
traits:
Geologic age
Metamorphic age
Fossil content
Rock type
TERM 5
Geologic Formation vs. Unit
DEFINITION 5
Unit: Non-sedimentary geologic units (have the rock in
name)Formation : Sedimentary geologic feature
