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25 Cards in this Set
- Front
- Back
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Metamorphism is a change in . . .
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1. mineralolagy
2. texture 3. solid state 4. structure |
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Does metamorphism include melting? Why or why not?
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No, because then it would be igneous.
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Metamorphic rock
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rock that forms from a protolith when the protolith undergoes mineralogical and textural changes in response to modification of its physical or chemical enviro.
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Protolith
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original rock that gets metamorphosed
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The amount of change to a protolith depends upon . . .
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composition + temp + pressure
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limestone becomes . . .
granite becomes . . . |
marble
gneiss |
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stability field
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minerals exist under a specific range of temperatures and pressure
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lithostatic pressure
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pressure from all around
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differential stress
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being stretched unequally from different sides
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foliation
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alignment of platey minerals
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deformation/lineation
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the creation of elongated grains
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shear stress
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causes rock to shear
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preferred mineral orientation results from
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the internal texture of a rock changing as it changes shape
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gneiss is identified by
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alternating bands of light and dark minerals
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non-foliated metamorphic rocks
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quartzite (from ss)
marble (from ls) low grade greenstone (from basalt) hornfels amphibolite |
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foliated metamorphic rocks
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slate
phyllite schist flattened-clast conglomerate schist gneiss |
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metamorphic grade
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indicates amount or degree of metamorphic change
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prograde metamorphism
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occurs when both temp and pressure increase
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retrograde metamorphism
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takes place when temps and pressure progressively decrease; water must be added back to the rock
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high temperature, low pressure in subduction zones create
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blue schist
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What are the 3 types of metamorphism?
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1. contact
2. regional 3. dynamic |
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Define Contact Metamorphism
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lots of heat, less pressure, from an intrusion
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Define Regional Metamorphism
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overlying rocks cause pressure
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Define Dynamic Metamorphism
What is a common result? |
occurs along faults, friction and heat from shearing
mylonite |
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hydrothermal fluid
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hot water that hydrates a rock and changes its internal chemistry
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