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1200
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Geology
Date
Dec 6, 2023
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Metamorphism and Metamorphic Rocks Metamorphism and Metamorphic Rocks
1.
What term describes the zone of contact metamorphism that surrounds an intrusive
magma body?
○
Aureole
2.
Which one of the following is not likely to be genetically associated with impact of an
asteroid or large meteorite?
○
Blueschists
3.
What metamorphic rock forms during the metamorphism of limestone or dolostone?
○
Marble
4.
What term describes a strong, parallel alignment of coarse mica flakes and/or of different
bands in a metamorphic rock?
○
Foliation
5.
What type of foliation results from the parallel alignment of abundant, coarse-grained,
mica flakes in a metamorphic rock?
○
Schistosity
6.
What is the major source of heat for contact metamorphism?
○
Heat from a nearby magma body
7.
What type of metamorphic facies associated with the subduction of oceanic crust and
sediments forms at very high pressure but moderately low temperature?
○
Blueschist
8.
Which of the following situations would exhibit sheared and mechanically fragmented
rocks?
○
Fault movements at shallow depths
9.
What major change occurs during metamorphism of limestone to marble?
○
Calcite grains increase in size.
10. Which of the following rock types form during the highest grade of regional
metamorphism?
○
Schist
11. What nonfoliated metamorphic rock forms during contact metamorphism of a shale or
mudstone?
○
Hornfels
12. What metamorphic environment produces tektites?
○
High temperatures associated with meteorite impacts
13. Which low-grade metamorphic rock, composed of extremely fine-sized mica and other
mineral grains, typically exhibits well developed rock cleavage?
○
Slate
14. In which setting would regional metamorphism be most likely?
○
At great depths in the crust where two continents are colliding
15. Which of the following lists foliated metamorphic rocks in the order of increasing grain
size and increasing grade of metamorphism?
○
Slate, phyllite, and schist
16. Of the following rock types, which is characterized by the segregation of light- and dark-
colored minerals into thin layers or bands?
○
Granitic gneiss
17. What metamorphic rock forms from sandstone?
○
Quartzite
18. What platy, parallel mineral grains are the most visual aspect of foliated metamorphic
rocks?
○
Micas
19. Which of the following statements concerning slate is not true?
○
Slate has abundant, coarse-grained mica.
○
True:
i.
Slate forms from shales and mudstones.
ii.
Sedimentary features may be visible in slates.
iii.
In slate, rock cleavage is common.
20. What foliated, metamorphic rock is texturally intermediate between slate and schist?
○
Phyllite
21. During metamorphism, what is the major effect of chemically active fluids?
○
They aid in the movement of dissolved silicate constituents and facilitate growth
of the mineral grains.
22. Which of the following best describes the conditions of contact metamorphism?
○
Pressures are fairly low, the rock may be in the upper part of the crust, and heat is
supplied from a nearby magma body such as a pluton, dike, or sill.
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