Chapter 8

Question 1

Low-grade metamorphism that occurs in the lowest layers of very thick accumulations of sedimentary strata

Answer 1

Burial metamorphism

Question 2

Stress that is applied uniformly in all directions

Answer 2

Confining pressure

Question 3

Changes in rock caused by the heat from a nearby magma body

Answer 3

Contact metamorphism

Question 4

Forces that are unequal in different directions

Answer 4

Differential stress

Question 5

A term for a linear arrangement of texture features often exhibited by metamorphic rocks

Answer 5

Foliation

Question 6

A texture of metamorphic rocks in which dark and light silicate minerals are separated; giving the rock a banded appearance

Answer 6

Gneissic texture

Question 7

Chemical alterations that occur as hot, ion-rich water circulated through fractures in rock

Answer 7

Hydrothermal metamorphism

Question 8

A zone or halo of contact metamorphism found in the rock surrounding an igneous intrusion

Answer 8

Aureole

Question 9

Metamorphism that occurs when meteorites strike earths surface

Answer 9

Impact metamorphism

Question 10

A mineral that is a good indicator of the metamorphic environment in which it formed. Used to distinguish different zones of regional metamorphism

Answer 10

Index mineral

Question 11

The changes in mineral composition and texture of rock subjected to high temperatures and pressures within earth

Answer 11

Metamorphism

Question 12

When substantial chemic change accompanies metamorphism

Answer 12

Metasomatism

Question 13

A rock exhibiting both igneous and metamorphic rock characteristics. Such rocks may form when light colored silicate minerals melt and then crystallize, while dark minerals remain solid

Answer 13

Migmatite

Question 14

Metamorphic rocks that do not exhibit foliation

Answer 14

Nonfoliated texture

Question 15

The rock from which a metamorphic rock formed

Answer 15

Parent rock

Question 16

Metamorphism associated with large scale mountain building

Answer 16

Regional metamorphism

Question 17

The tendency of rocks to split along parallel, closely spaced surfaces. These surfaces are often highly inclined to the bedding planes in the rock

Answer 17

Rock cleavage

Question 18

A type of foliation characteristic of coarser grained metamorphic rocks. Such rocks have parallel arrangements of Plath minerals such as the Micas.

Answer 18

Schistosity

Question 19

The type of foliation characteristic of slates in which there is a parallel of fine-grained metamorphic minerals

Answer 19

Slaty-cleavage

Question 20

Results from the crushing and shearing of rock during tectonic movement, generally localized along fault planes

Answer 20

Cataclastic metamorphism

Question 21

A group of associated minerals that are used to establish the pressures and temperatures at which rocks undergo metamorphism

Answer 21

Metamorphic facies