Ch 7 Metamorphic Rocks

25 July 2022
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question
What two metamorphic rocks are composed predominantly of single minerals?
answer
marble & quartzite
question
Which of the following statements concerning slate is not true?
answer
Has abundant, coarse-grained mica
question
What major change occurs during metamorphism of limestone to marble?
answer
Calcite grains grow larger and increase in size
question
Which low-grade metamorphic rock, composed of extremely fine-sized mica and other mineral grains, typically exhibits well-developed rock cleavage?
answer
Slate
question
forms by contact metamorphism of mudstones and shales
answer
hornfels
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foliated fine-grained metamorphic rock formed from mudstone and shale
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phyllite
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nonfoliated metamorphic rock consisting mostly of calcite
answer
marble
question
coarse-grained, metamorphic rock with alternating bands or stringers of light and dark minerals
answer
gneiss
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What platy, parallel, mineral grains are the most visual aspect of foliated metamorphic rocks?
answer
micas
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Tektites originate in what metamorphic environment?
answer
High temperature associated with meteorite impacts
question
Which one of the following is not likely to be genetically associated with impact of an asteroid or large meteorite?
answer
blueschists
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What is the major source of heat for contact metamorphism?
answer
Heat from a nearby magma body
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_______ is a strong, parallel alignment of coarse mica flakes and/or of different mineral bands in a metamorphic rock.
answer
Foliation
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________ is a nonfoliated rock formed by contact metamorphism of a shale or mudstone.
answer
hornfels
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________ is typically formed by metamorphism of a sandstone.
answer
Quartzite
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Which of the following metamorphic rocks could be used to neutralize acidic mine waters?
answer
marble
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________ forms from the metamorphism of limestone or dolostone.
answer
marble
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which of the following lists the rocks in the order of increasing grain size and increasing grade of metamorphism?
answer
slate, phyllite, schist
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________ is characterized by the segregation of light- and dark-colored minerals into thin layers or bands.
answer
Granitic gneiss
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What type of foliation results from the parallel alignment of abundant, coarse-grained, mica flakes in a metamorphic rock?
answer
schistosity
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Which of the following best describes the conditions of contact metamorphism?
answer
Pressures are fairly low, the rock is in the upper part of the crust, the heat is supplied from a nearby magma body
question
Calcite is the main mineral constituent of the sedimentary rock limestone and of the metamorphic rock marble.
answer
true
question
Rock cleavage or slaty cleavage in slates is largely a consequence of abundant, parallel-aligned, very fine-grained mica flakes in the rock.
answer
true
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Slate and schist are both derived by metamorphism of shales and mudstones.
answer
true
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Three major factors involved in metamorphism are elevated temperature, elevated pressure, and the chemical action of hot fluids.
answer
true
question
The distinctive layers or bands of different minerals in gneisses may be complexly folded.
answer
true