Metamorphic Rocks Formed from heat and pressure changing the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock.
Where does the pressure come from? Pressure comes from: The weight of all the rock above Plate collisions (Regional Metamorphism)
Regional Metamorphism
How do high temperatures metamorphose rocks (without melting)? Rocks are heated when: they get buried, because it gets warmer as you go deeper they are near magma and get heated, especially as hot mineral rich water moves through it and reacts with it – Contact Metamorphism New minerals can be formed in . metamorphic rocks when . atoms are exchanged between . neighboring minerals within the . rock. Different combinations of heat and pressure can turn one . rock into several different metamorphic ones.
Contact Metamorphism
Characteristics of Metamorphic Rocks Foliated - Parallel alignment of flattened mineral grains and pebbles Caused when rock is squeezed and grains or crystals flatten and line up in parallel layers Rocks with foliated stripes made of different minerals are called banded. Unfoliated - Rocks that are not banded and do not break into layers
Metamorphic Rocks Gneiss Quartzite Garnet Schist Slate
Unfoliated Marble Quartzite
Deformation is the change in the shape of a rock caused by a force placed on it. Gneiss Shale
Parent Rocks Shale, mudstone or siltstone can become slate Slate can become phyllite Phyllite can become schist Schist can become gneiss Granite can become gneiss Sandstone can become quartzite Limestone can become marble
The Rock Cycle