Unit Three - Rocks and Minerals - Metamorphic Rocks Flashcards
What is Contact Metamorphism?
When heat from magma rearranges the atoms in rocks that are nearby
What are the two types of Metamorphism?
- Regional Metamorphism
- Contact Metamorphism
What is foaliation?
Due to extreme pressure, minerals rearrange into flat layers.
What are Metamorphic Rocks?
Parent rocks that are altered by an increase in temptrature and/or pressure
What is a Parent Rock?
Preexisting rock from which metamorphic rocks are formed.
What is Non - foaliated?
When minerals rearrange and change form but do not change layers
What are the three types of textures to classify a metamorphic rock?
- Foliation
- Banding
- Non - foaliated
How does pressure affect a metapmorphic rock?
- Under extreme pressure atoms bonds are broken
- Atoms are rearranged into a denser and more compact structure.
How does heat affect a metamorphic rock?
- Rock EXPANDS when heat causes atoms to break bonds and move
- When temp. decreases, atoms join with other atoms to form different compounds
The result is a structural and chemical change
These are notes about contact metamorphism that will form a deeper understanding.
There is a stream of magma underneath the earth, that is in between sedimentary rocks. The magma that is in contact with those sedimentary rocks is truly metamorphic rocks, since the high heat of the magma and the pressure beneath the earth factors into the creation of the metamorphic. You can also identify the type of metamorphic rock by the parent rock, which is the type of sedimentary rock that is in contact with the magma.
What is banding?
Pressure seperates minerals into alternating light and dark layers (Type of foaliation).
What is Regional Metamorphism?
Metamorphic rocks are formed over large areas due to extreme temperatures and pressures.
Ex: Underneath Mountain
This is the most common and standard type of metamporphism.
