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Flashcards in Chapter 8 Deck (21):
1

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

Burial metamorphism

2

Stress that is applied uniformly in all directions

Confining pressure

3

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

Contact metamorphism

4

Forces that are unequal in different directions

Differential stress

5

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

Foliation

6

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

Gneissic texture

7

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

Hydrothermal metamorphism

8

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

Aureole

9

Metamorphism that occurs when meteorites strike earths surface

Impact metamorphism

10

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

Index mineral

11

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

Metamorphism

12

When substantial chemic change accompanies metamorphism

Metasomatism

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

Migmatite

14

Metamorphic rocks that do not exhibit foliation

Nonfoliated texture

15

The rock from which a metamorphic rock formed

Parent rock

16

Metamorphism associated with large scale mountain building

Regional metamorphism

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

Rock cleavage

18

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

Schistosity

19

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

Slaty-cleavage

20

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

Cataclastic metamorphism

21

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

Metamorphic facies