Metamorphism and METAMORPHIC Rocks

Question 1

These rocks have altered fabric form the parent rock by different mineral sizes, arrangements, and textures.

Answer 1

metamorphic rocks

Question 2

process of transforming minerals and structures of rocks involving heat and distortion, together or separately.

Answer 2

metamorphism

Question 3

2 types of metamorphism

Answer 3

regional and contact

Question 4

5 main factors of metamorphism

Answer 4

Parent rock mineral fabric
Temperature
Pressure
Fluid availability (usually water)
Time

Question 5

considered to be the igneous or sedimentary rock origin of the metamorphic rock

Answer 5

parent rock

Question 6

affects the texture and cause foliation

Answer 6

pressure

Question 7

same pressure from all directions

Answer 7

equal confining pressure

Question 8

side pressure higher than top and bottom pressure

Answer 8

directed pressure

Question 9

pressure pushes sides in opposite directions

Answer 9

shear stress

Question 10

same composition different crystal structure

Answer 10

polymorphs

Question 11

other 2 types of metamorphic rocks

Answer 11

foliated and non-foliated

Question 12

directed pressure / shear stress

Answer 12

foliated

Question 13

no to little pressure

Answer 13

non-foliated

Question 14

the “layering” or “banding” in metamorphic rocks causing “sheet-like” structure

Answer 14

foliation

Question 15

4 classifications of foliated rocks

Answer 15

slaty, phyllitic, schistose, gneissic

Question 16

From low-grade metamorphism of shale.
Microscopic clay and mica crystals have grown and aligned perpendicular to the largest stress.
Breaks into very thin flat sheets along cleavage using a chisel

Answer 16

slaty

Question 17

Similar to slate but heated to a higher temperature
Has larger mica crystals but still barely visible to the eye as sheen on the surface
Can form in wavy / silky / crenulated layers

Answer 17

phyllite

Question 18

High enough temperatures forming mica big enough to be seen by the naked eye, possibly with quartz, feldspar, etc. visible.
Strongly foliated and often bonded with coarse crystals.

Answer 18

schist

Question 19

Minerals have been separated into distinct bands
Dark bands are usually biotite and hornblende and light bands are quartz and feldspar.
Foliation is not as intense as schist.

Answer 19

gneiss

Question 20

Form in areas where pressure is just confining pressure (same pressure from all sides) or low-pressure conditions.
Mostly, these rocks are not buried deep enough and the heat is coming from a nearby body of magma.

Answer 20

non-foliated rocks

Question 21

the difference of a material’s property at
different directions.

Answer 21

anisotropy