METAMORPHIC ROCKS Flashcards
Different temperature and pressure ranges create specific sets of metamorphic minerals that are called metamorphic facies. Using the graph, determine what facies a rock would be found in if it was buried 30 km deep and heated to a temperature of approximately 200 degrees
Blueschist
Shale, a sedimentary rock, can be subjected to high heat and pressure through
burial during continental collision.
What type of metamorphism would occur at a plate boundary where two continents are colliding?
Dynamothermal or regional metamorphism
Which type of foliation does gneiss have?
Compositional layering
During metamorphism, the process that changes the crystal structure of a mineral without changing its chemical composition is called
phase change.
Which agent of metamorphism involves hot water moving ions?
Interaction with hydrothermal fluids
Metamorphic grade is determined mainly by
temperature.
Identify the metamorphic process that is shown in the image.
Recrystallization
The temperature range for the formation of low-grade metamorphic rocks is __________ degrees C.
250 to 400
Which nonfoliated metamorphic rock forms from the metamorphism of limestone?
Marble
Which statement about the pathways of the rock cycle is TRUE?
Granite that is eroded, transported, deposited, and lithified will become a sedimentary rock.
Using the graph, determine what type of metamorphism (related to its geologic setting) a rock would likely be experiencing if it was at a depth of 20 km and heated to a temperature of 500 degrees C.
Mountain belt metamorphism
Metamorphism can occur in the surrounding rock as an igneous pluton forms. Which type of metamorphism is most likely to occur in the surrounding rock?
Thermal or contact metamorphism
A rock experienced melting then cooling, burial to deep depths during mountain building, and then uplift and weathering. Which pathway did this rock take through the rock cycle?
Igneous → metamorphic → sedimentary
When a rock is subjected to compressional pressure, the grains will
elongate perpendicular to the direction of stress.
In a rock undergoing metamorphosis, which type of stress occurs when one part of a rock moves sideways relative to the rest of the rock?
Shear stress