What occurs in the Earth to change these rocks?
- Pressure from overlying rock layers
- High heat, but not enough to melt the rockRocks may be flattened or bent or atoms may be exchanged to form new mineral
You can think of metamorphic rocks as a squished peanut butter & jelly sandwich in your lunch.
How are metamorphic rocks classified?
- Non-Foliated—No bands are formed
- Example: marble formed from limestone
Non-foliated metamorphic rocks include marble, which comes from limestone, and quatzite, which comes from sandstone
- High temperatures and pressures at depth cause changes in mineralogy, texture, and composition
–Changes take place in Solid State by recrystallization and chemical reactions
–Temperatures greater than 250°, less than 700°
- Regional Metamorphism - High pressures and temperatures derive from regional collision, deformation and mountain building.
- Contact Metamorphism - Locally high temperatures, adjacent to intrusions.
–Changes take place in Solid State by recrystallization and chemical reactions
–Temperatures greater than 250°, less than 700°
- Regional Metamorphism - High pressures and temperatures derive from regional collision, deformation and mountain building.
- Contact Metamorphism - Locally high temperatures, adjacent to intrusions.
Types of Metamorphic Rocks
What is a metamorphic rock?
A metamorphic rock is any sedimentary or igneous rock that has been changed, or morphed, because of pressure and heat.
- Marble
- Schist
How is a metamorphic rock made?
Metamorphic rocks are made deep inside the earth where heat and pressure change the rocks
IGNEOUS ROCKS 1
