Lecture Quiz #5
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Blinn College *
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1403
Subject
Geology
Date
Apr 3, 2024
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docx
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Lecture Quiz
#5
Metamorphic rocks
1.
Metamorphism typically occurs:
Deep beneath Earth’s surface.
2.
The metamorphic grade refers to:
The degree to which the parent rock changes during metamorphism.
3.
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.
4.
What is the principal effect of heat as a metamorphic agent?
Recrystallization of mineral grains.
5.
The best clue for identifying the parent rock from which a metamorphic rock was derived is:
The chemical composition of the metamorphic rock.
6.
Is a strong, parallel alignment of coarse mica flakes and/or of different mineral bands in a metamorphic rock?
Foliation.
7.
Give two examples of metamorphic rocks with a
nonfoliated
texture:
Marble, Quartzite, and Hornfels
8.
Is typically formed by metamorphism of a sandstone?
Quartzite.
9.
What foliated, metamorphic rock is texturally intermediate between slate and schist?
Phyllite.
10.
Lists the rocks in the order of increasing grain size and increasing grade of metamorphism beginning with unmetamorphosed shale?
Slate, Phyllite, Schist, and Gneiss.
11.
Provide a description of the conditions of contact metamorphism?
Pressures are fairly low, the rock is in the upper part of the crust, and heat is supplied from a nearby magma body. 12.
What rock type forms at the highest grade of regional metamorphism?
Schist.
13.
Which type of metamorphism occurs specifically in the heated zone around a pluton or other body of magma?
Contact or thermal metamorphism.
14.
Can provide good indication of the metamorphic environment in which a rock formed?
Index minerals.
15.
What is meant by confining pressure?
When pressure is applied equally on all surfaces of a rock.
16.
Is a common mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks?
Quartz.
17.
Is typically formed by metamorphism of a
limestone.
Marble.
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