Metamorphic Rocks

Question 1

Metamorphism

Answer 1

Isochemical changes by which rocks are changed by heat and or pressure

Question 2

Metamorphic aureole

Answer 2

The area of country rock altered by the igneous intrusion

Question 3

Factors affecting aureole width

Answer 3

Angle of intrusion
Temp of intrusion
Country rock
Size and comp of intrusion

Question 4

Polymorph

Answer 4

A mineral which exists in 2+ forms with identical chemical compositions

Question 5

Metamorphic facies

Answer 5

Set of metamorphic minerals that were formed under similar temps and pressures

Question 6

Porphyroblastic fabrics

Answer 6

Large crystal that grew during metamorphism and surrounded by finer ground mass

Question 7

Granoblastic fabric

Answer 7

Randomly oriented equidimensional crystals

Question 8

Crenulation cleavage

Answer 8

Amount/ direction of stress applied to rocks varies so several foilations in different directions

Question 9

Slaty cleavage

Answer 9

Rock that split into thin sheets along their cleavage planes

Question 10

Schistosity

Answer 10

Rock having a silky shine die to the parallel alignment of micas

Question 11

Gneissose banding

Answer 11

Formed when light and dark minerals separated into bands