4.4 Metamorphic Rocks
What is a common feature of metamorphism?
A common feature of metamorphism is foliation.
What does change in pressure cause?
Change in pressure cause minerals to align and form layers.
Change in temperature/ pressure and addition of chemical fluids can lead to what?
Change in temperature/ pressure and addition of chemical fluids can result in rearrangment of minerals or formation of minerals.
How is the change in pressure different than clastic sedimentary rocks?
Changes in pressure cause minerals to form layers in both clastic and metamorphic rocks but the difference in this is the presence of crystalline minerals.
What are clues of metamorphism?
Clues of metamorphism is changes in composition and structure.
Foliated rocks definition?
Foliated rocks contain parallel layers of flat and elongated minerals.
Definition of regional metamorphism?
Is the formation of metamorphic rock bodies that are hundreds of square kilometers in size in which can create mountain ranges.
How is the crystal arrangment of non-foliated metamorphic different than in igneous rocks?
It is a different arrangment because metamorphic non-foliated rocks are multi-colored and igneous rocks are not.
Where do most metamorphic rocks form?
Most metamorphic rocks form deep in earth's crust.
When do non-foliated rocks form?
Non-foliated rocks form when magma intrudes rock.
Definition of non foliation?
Non-foliation is metamorphic rock that have mineral grains with a random, interlocking pressure with no obvious alignment of mineral crystals.
Define plastic deformation?
Plastic deformation is the permanent change in shape by bending or folding(1 way texture changes in metamorphism).
When does plastic deformation occur?
Plastic deformation occurs during uplift events when tectonic plates collide and form mountains.
What are the mineral crystals like in non-foliated metamorphic rocks>?
The crystals are blocky and approximately equal in size.
What happens to the parent rock in metamorphism and when does this occur?
The parent rock when exposed to high temperature and pressure are buried deeper in earth's surface by tectonic plates. This occurs at temperatures greater than 200 celcius and pressure greater than 3kb.
What is the rock called that changes in metamorphism?
The rock that changes in metamorphism is called the parent rock.
How are metamorphic rocks different and similair to sedimentary rocks?
They are similair because they can form layers but are not formed through deposition.
What happens as you go deeper into earth's interior?
As you go deeper into earth's interior temperature and pressure increase.
What can contact metamorphism do?
Contact metamorphism can increase crystal size, form new minerals and change rocks.
Contact Metamorphism definition?
Contact metamorphism is when magma comes in contact with exsisting rock, its thermal energy and gases interact and form this rock.
Metamorphic non-foliated examples?
Examples of metamorphic non- foliated rocks are marble and quartzite.
Example of regional metamorphism?
Examples of regional metamorphism has formed the Appalachian Mountains and the Himalaya's in Asia.
Metamorphic foliated rock examples?
Examples of this are slate, gneiss, schist and phyllite.
What two groups are metamorphic rocks classified into?
Metamorphic rocks are classified based on texture and the two groups are foliated and non- foliated.
What are metamorphic rocks effected by?
Metamorphic rocks are effected by changes in temperature and pressure.
How are metamorphic rocks identified?
Metamorphic rocks are identified by texture and composition.
How are metamorphic rocks similair and different than igneous rocks?
Metamorphic rocks are similair to igneous rocks because they form under high temperature and pressure conditions but they do not crystallize from magma.
Define metamorphism?
Metamorphism is any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure or addition of chemical fluids.
What does high pressure cause foliated rocks to do?
When foliated rocks are in conditions of high pressure they cause some minerals to align perpendicular to the pressure, which causes bands/layers of dark and light colors.
What happens to rock as temperature and pressure increase?
When pressure and temperature increase a metamorphic rock becomes plastic-like.
