Geology Powerpoint 6 Quiz- Metamorphic Rocks
Non-foliated metamorphic rocks are composed of what kind of minerals?
Fine grained
Granular
Angular
Coarse grained
What have metamorphic rocks been mineralogically or texturally changed by?
Water and Heat
Water and pressure
Heat and Wind
Heat and Pressure
Rocks are metamorphosed, I.e. Changed mineralogically or texturally by what commonly?
Solids
Mica
Shale
Fluids
What do metamorphic rocks provide a window into?
Temperatures
Pressures
Fluid composition
It provides a window into all of these
Metamorphism occurs at pressures and temperatures much _____ than those on the earth's surface?
Higher
Lower
The same
There is no answer
Metamorphic rocks occur below temperatures and pressure conditions that cause melting.
False
True
Where do metamorphic rocks form?
Mantle
Middle crust
Lower crust
Both middle and lower crust
Metamorphic rocks remain in what state?
The solid state
The liquid state
The gaseous state
The fluid state
What three things increase as you go from low grade rock to high grade?
Increasing intensity of metamorphism
Increasing crystal size
Increasing coarseness of foliation
All of these
What rocks break smoothly along foliation planes for foliated metamorphic rocks?
Phyllite
Gneiss
Slate
Mica
True or false phyllite is very fine grained
True
False
True or false- schists are not coarser than phllyite and will not break along cleavage planes?
True
False
What are the light bands made on gneiss?
Quartz
Amphibole
Biotite
Feldspar
Both amphibole and biotite
Both quartz and feldspar
What results in secondary minerals, streaks and bands in marble?
Fracturing and rejoining
Impurities
Chemistry
Purities
What are the sources of causing heat in metamorphic processes?
Magma
Pressure
Both magma and burial
Burial
What reduced space and drives reactions to denser forms of minerals?
Differential stress
Confining pressure
Contracting pressure
Differential contraction
Differential stress is also called directed pressure and results in ultimately what?
Fracture
Non-foliation
Faulting
Foliation
Differential stress cause _____ of _____ or ___ minerals and growth of new minerals in the same direction
What are the three sources of fluids from metamorphism?
Ground/sea water
Magma
Release of water from minerals
All of these
When chemical change in a rock results from interaction with fluids what is it called?
Metamorphism
Metasomatism
Metasomas
Somatism
What type of metamorphism includes pressures, temperatures and fluids?
Regional
Contact
Shock
Cataclastic
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