Geology Chapter 8 – Flashcards

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question
Metamorphism involves the transformation of pre-existing rocks by _____.
answer
heat and pressure
question
How are metamorphic rocks formed?
answer
Preexisting rock is altered through heat and pressure.
question
Do metamorphic rocks look like the preexisting rock from which they form?
answer
sometimes, but not always
question
What is foliation?
answer
banding in metamorphic rocks that results from the reorientation of minerals
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How will foliation in continental metamorphic rocks formed during subduction be oriented?
answer
perpendicular to the direction of plate movement
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What would you call a granite that has undergone metamorphism and now exhibits foliation?
answer
gneiss
question
Which of the following factors describe the conditions at a zone where low-grade regional metamorphism is occurring?
answer
low pressure low temperature
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Which of the following factors describes the conditions at a zone where contact metamorphism is occurring?
answer
high temperature low pressure
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What is a metamorphic aureole?
answer
a ring of metamorphic rocks adjacent to an igneous intrusion
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How is quartz sandstone metamorphosed into quartzite during contact metamorphism?
answer
Sand grains are fused together because of high temperatures.
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Which of the following best describes confining pressure and the location in which it occurs?
answer
moderate pressures at shallow depths
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What do we call a metamorphic rock that has microscopic to very fine-grained texture, breaks into slabs or sheets and is dull on the surface?
answer
slate
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What do we call a metamorphic rock that has a coarse-grained texture, is dominated by mica, and contains no other notable minerals?
answer
mica schist
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Which of the following statements describes a mylonite?
answer
They are formed through ductile deformation.
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Which of the following phrases describes brittle deformation?
answer
Metamorphic rocks are broken. It occurs at cold temperatures.
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What would the presence of a fault breccia tell you about the history of an area?
answer
Brittle deformation occurred. A transform fault was present.
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During metamorphic process, the rock essentially remains a _____.
answer
solid
question
Metamorphism can lead to changes in _____.
answer
mineralogy texture chemical composition
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