Metamorphic Rocks Overview
- Rocks are classified based on how they form; metamorphic rocks originate from existing rocks subjected to extreme heat and pressure.
- Sedimentary, igneous, and even existing metamorphic rocks can all transform into new metamorphic rocks.
- The original rock is called the proto lift, commonly referred to as the camp parent rock.
- Contact metamorphism: Occurs when existing rock comes into contact with extreme heat, such as magma inside the earth.
- Regional metamorphism: Driven by extreme pressure that presses and squeezes rock into a new form, often occurring at convex convergent plate boundaries.
Classification and Rock Transitions
- Foliated rocks: Metamorphic rocks characterized by distinct layers or bands.
- Non-foliated rocks: Metamorphic rocks that lack layers or bands.
- Shale progression: Shale morphs into slate, which morphs into phyllite, transfers into schist, and can morph into night.
- Sandstone transformation: Sandstone exposed to heat or pressure morphs into quartzite.
- Limestone transformation: Limestone morphs into marble.