1. EARTH MATERIALS EQ:What are metamorphic rocks?
CLASSROOM
UNSQUARED
EARTH MATERIALS EQ:What are metamorphic rocks?
A rock that has changed its mineral assemblage and texture from a pre-exiting one due to increases in temperature and pressure .
Metamorphic Rocks

2. Metamorphic Rocks A. Temperature Pressure (Stress) B.
Depth of burial
(Avg. geothermal gradient = C / km)
Proximity to magma
Pressure (Stress)
A. Overburden
(Avg. geopressure gradient = 33 MPa / km)
B. Lateral Compression
Old bedding planes B.
Foliation
Metamorphism causes
Recrystallization
Foliation (mineral bands)
Chemical change
Metamorphic grade

3. Metamorphic Rocks and Parent Rocks
Sandstone
Shale
Limestone
Granite
Diorite
Slate
Phyllite
Schist
Metamorphic Rock
Quartzite
Slate
Marble
Gneiss
Phyllite
Schist
(Identification Key)

4. Two Kinds of Metamorphism
Regional metamorphism
Compression in convergent plate boundary
Covers large area in a region along a plate boundary
Contact metamorphism
Local effect along the margin of a magma intrusion
Location of valuable mineral ores