metamorphic rock. definition of metamorphic rocks metamorphic rocks are formed when existing rocks...

Metamorphic Rock

Definition of Metamorphic Rocks

• Metamorphic rocks are formed when existing rocks are changed into a new rock because of heat, pressure, or chemical change

HeatPressure

Types of Metamorphism

Regional Metamorphism

• Occurs over a wide area.

• The heat and pressure are created at convergent boundaries where plates are colliding

• Usually produces foliated rocks

Contact Metamorphism

• A rock’s mineral and texture changes when the rock comes into contact with a magma chamber

• Change caused mainly by heat

• Creates mainly non-foliated rocks

Contact Metamorphism

Types of Metamorphic Rocks

• Foliated Rocks metamorphic rocks formed under great pressure where the new minerals are aligned into bands

• Non-Foliated Rocks metamorphic rocks

formed under lower heat and pressure where the minerals are not aligned into bands

Foliated Rock Examples

Parent Rock: Shale Daughter Rock: Slate

Foliated Rock Examples

Parent Rock: Granite Daughter Rock: Gneiss

Foliated Rock Examples

Parent Rock: Sandstone Daughter Rock: Schist

Non-Foliated Rock Examples

Parent Rock: Limestone Daughter Rock: Marble

Non-Foliated Rock Examples

Parent Rock: Sandstone Daughter: Quartzite