Question 1

A heavy book is placed on top of a ball of pizza dough,causing the dough to flatten.This is an application of

Accepted Answer

A)   normal stress.
B)   pressure.
C)   shear stress.
D)   metasomatism.E) B) and C)
F) A) and D)

Question 2

What is a metamorphic aureole? What is the relationship between grade of metamorphism and proximity to the intrusion? What types of conditions are responsible for the formation of an aureole?

Accepted Answer

A metamorphic aureole is a zone of alter...

Question 3

________ metamorphism affects the greatest volumes of rock and produces the greatest variety in metamorphic rock types.

Accepted Answer

A)   Thermal
B)   Regional
C)   Dynamic
D)   ShockE) B) and C)
F) A) and B)

Question 4

Marble and quartzite are non-foliated metamorphic rocks because

Accepted Answer

A)   they are never found beneath fault zones or collisional mountain ranges.
B)   both are dominated by minerals that produce equant grains.
C)   both are dominated by minerals with crystalline structures that cannot be dissolved.
D)   dynamothermal metamorphism can break down the structures of their constituent minerals,but the minerals are unstable in that metamorphic environment.E) A) and D)
F) None of the above B

Question 5

A body of gneiss is subjected to heat and forms a melt.Later,the melt cools and crystallizes to form a(n) ________ rock.

Accepted Answer

A)   metamorphic
B)   igneous
C)   sedimentary
D)   volcanicE) A) and C)
F) A) and B)

Question 6

Mylonites,formed from dynamic metamorphism,typically occur where there has been substantial

Accepted Answer

A)   high temperature.
B)   high pressure.
C)   hydrothermal fluid movement.
D)   shearing.E) B) and D)
F) All of the above

Question 7

The blueschist facies form under which of these conditions?

Accepted Answer

A)   high temperature and high pressure
B)   low temperature and low pressure
C)   high temperature but relatively low pressure
D)   high pressure but relatively low temperatureE) None of the above
F) All of the above

Question 8

What distinguishes metamorphic grade from metamorphic facies?

Accepted Answer

Metamorphic grade is a somewhat informal...

Question 9

Rocks resulting from shock metamorphism are likely to reveal minerals that underwent _______.

Accepted Answer

A)   plastic deformation
B)   hydrothermal alteration
C)   a phase change
D)   recrystallizationE) A) and D)
F) A) and B)

Question 10

The mineral assemblage within metamorphic rock is

Accepted Answer

A)   always identical to that found within its protolith.
B)   dependent only on the mineral assemblage of its protolith.
C)   dependent only on the temperature and pressure of formation.
D)   dependent on both the mineral assemblage of its protolith and the temperature and pressure of formation.E) None of the above
F) A) and C)

Question 11

Regional metamorphism

Accepted Answer

A)   takes place at low temperatures and low pressure.
B)   takes place at low temperatures but high pressure.
C)   is another name for thermal metamorphism.
D)   is another name for dynamothermal metamorphism.E) A) and C)
F) A) and D)

Question 12

A buried body of shale is subjected to differential stress,causing clay minerals to realign and produce slate.This is an example of

Accepted Answer

A)   diagenesis.
B)   erosion.
C)   metamorphism.
D)   weathering.E) None of the above
F) C) and D)

Question 13

Which of the following is a primary difference between phyllite and schist?

Accepted Answer

A)   Schist contains mica,whereas phyllite contains only clay.
B)   Phyllite contains mica,whereas schist contains only clay.
C)   Mica crystals within schist are larger than those within phyllite.
D)   Mica crystals within phyllite are larger than those within schist.E) C) and D)
F) B) and D)

Question 14

Which list properly orders foliated metamorphic rocks from lowest to highest grade from left to right?

Accepted Answer

A)   conglomerate,sandstone,siltstone,and shale
B)   shale,slate,phyllite,and quartzite
C)   slate,phyllite,schist,and gneiss
D)   gneiss,phyllite,schist,and slateE) C) and D)
F) B) and D)

Question 15

Metamorphism caused by shear stress that does not require changes in temperature or pressure results in a rock known as _________.

Accepted Answer

A)   slate
B)   gneiss
C)   breccia
D)   myloniteE) A) and D)
F) None of the above D

Question 16

What is an index mineral? What do metamorphic isograds indicate? What is a metamorphic zone?

Accepted Answer

An index mineral is a mineral that forms...

Question 17

In the formation of gneiss from a granite protolith,distinctive compositional bands form because of

Accepted Answer

A)   crystals migrating within the rock.
B)   crystals dissolving,with atoms and ions migrating and reorganizing as new crystals.
C)   crystals melting,with new crystals solidifying in color bands.
D)   chemical reactions with groundwater.E) A) and B)
F) A) and C)

Question 18

Dynamothermal (regional) metamorphism occurs when

Accepted Answer

A)   rock becomes deeply buried during continental collision and mountain building.
B)   regression of the sea leads to erosion of sedimentary cover on a body of rock.
C)   the upper surface of a body of rock develops a thick soil profile.
D)   a pluton causes metamorphism in a small surrounding region.E) A) and B)
F) A) and C)

Question 19

Foliated metamorphic rocks possess

Accepted Answer

A)   leafy plant fossils (ancient foliage) .
B)   a homogeneous texture resulting from randomly oriented grains.
C)   mineral grains in preferred orientations or patterns of association.
D)   minerals precipitated directly from seawater.E) None of the above
F) C) and D) C

Question 20

Consult the figure below.Compared with amphibolite metamorphic facies,the minerals in greenschist facies occur in

Accepted Answer

A)   lower-grade rocks.
B)   higher-grade rocks.
C)   partially melted rocks.
D)   the same grade but a different chemistry due to different protoliths.E) All of the above
F) None of the above

Exam 7: Metamorphism: a Process of Change

A heavy book is placed on top of a ball of pizza dough,causing the dough to flatten.This is an application of

Correct AnswerverifiedShow Answer

What is a metamorphic aureole? What is the relationship between grade of metamorphism and proximity to the intrusion? What types of conditions are responsible for the formation of an aureole?

Correct AnswerverifiedA metamorphic aureole is a zone of alter...View AnswerShow Answer

________ metamorphism affects the greatest volumes of rock and produces the greatest variety in metamorphic rock types.

Correct AnswerverifiedShow Answer

Marble and quartzite are non-foliated metamorphic rocks because

Correct AnswerverifiedB

A body of gneiss is subjected to heat and forms a melt.Later,the melt cools and crystallizes to form a(n) ________ rock.

Correct AnswerverifiedShow Answer

Mylonites,formed from dynamic metamorphism,typically occur where there has been substantial

Correct AnswerverifiedShow Answer

The blueschist facies form under which of these conditions?

Correct AnswerverifiedShow Answer

What distinguishes metamorphic grade from metamorphic facies?

Correct AnswerverifiedMetamorphic grade is a somewhat informal...View AnswerShow Answer

Rocks resulting from shock metamorphism are likely to reveal minerals that underwent _______.

Correct AnswerverifiedShow Answer

The mineral assemblage within metamorphic rock is

Correct AnswerverifiedShow Answer

Regional metamorphism

Correct AnswerverifiedShow Answer

A buried body of shale is subjected to differential stress,causing clay minerals to realign and produce slate.This is an example of

Correct AnswerverifiedShow Answer

Which of the following is a primary difference between phyllite and schist?

Correct AnswerverifiedShow Answer

Which list properly orders foliated metamorphic rocks from lowest to highest grade from left to right?

Correct AnswerverifiedShow Answer

Metamorphism caused by shear stress that does not require changes in temperature or pressure results in a rock known as _________.

Correct AnswerverifiedD

What is an index mineral? What do metamorphic isograds indicate? What is a metamorphic zone?

Correct AnswerverifiedAn index mineral is a mineral that forms...View AnswerShow Answer

In the formation of gneiss from a granite protolith,distinctive compositional bands form because of

Correct AnswerverifiedShow Answer

Dynamothermal (regional) metamorphism occurs when

Correct AnswerverifiedShow Answer

Foliated metamorphic rocks possess

Correct AnswerverifiedC

Consult the figure below.Compared with amphibolite metamorphic facies,the minerals in greenschist facies occur in

Correct AnswerverifiedShow Answer

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A metamorphic aureole is a zone of alter...
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B

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Metamorphic grade is a somewhat informal...
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D

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An index mineral is a mineral that forms...
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C

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