Made of small grains of sand Sandstone
As the rock is exposed to () and/or () the individual mineral grains recrystallize. Grains are much larger Quartzite
There are 2 types of metamorphism that occur.
() metamorphism Lava Contact Metamorphism Magma Contact Metamorphism
Contact metamorphism Intrusive Igneous Rock Metamorphic Rock Extrusive Igneous Rock Metamorphic Rock Intrusive Igneous Rock Metamorphic Rock
Contact Metamorphism – () the () rocks
What is parent rock you ask…
Lets take a look. Side Note All metamorphic rocks come from () in a () rock. The parent rock is the original rock the metamorphic rock came from. Lets take a look.
Parent Rock
Contact metamorphism Parent rock Metamorphic rock
Parent Rock
Contact metamorphism Parent rock Metamorphic rock
Parent Rock It doesn’t say, but what sedimentary rock do you think is the parent rock?
conglomerate Metaconglomerate Parent rock Metamorphic rock
The 2nd type of metamorphism that occurs. 2. () metamorphism – heat and pressure combine to alter () over a large area. These rocks get changed when () plates collide. The () the rock is to the plate boundaries the more the rock gets changed.
Differential stress Regional metamorphism can create mountains!!!
Folded rock caused by plate tectonics Regional Metamorphism (large area)
Folded rock caused by plate tectonics Regional Metamorphism (large area)
What is the parent rock???
Foliation
Rock type and depth of burial
() regional metamorphism (high heat and pressure) () the minerals in a rock. This flattens and () the minerals. Foliated – flattened and aligned minerals. () rocks split easily along the flattened, aligned mineral layers. Lets see what foliation looks like…
The minerals normally line up perpendicular to the direction of the pressure.
When the minerals are () into light and dark mineral layers it is called () Nice!!! oops… Gneiss!!!
One more thing… Since metamorphic rocks are formed under such () what do think happens to their ()?
() metamorphism – just () that changes rock Summing it all up () metamorphism – just () that changes rock Regional ()– heat and () change rock
Metamorphic Rock Identification Reference tables page 7 Metamorphic Rock Identification Lets check out the properties of metamorphic rocks.
What it looks like
How big the mineral grains are
What minerals are in the rock
Is it formed by regional or contact metamorphism
Important information
Umm, rock names
How the rock may be shown on a map
Lets try to figure out a mystery metamorphic rock. Observed properties: 1. The texture is foliated, minerals are aligned but not banded. 2. The grains are fine to medium sized. 3. Contains, mica, quartz, feldspar, amphibole, garnet and pyroxene.
1. The minerals are aligned but not banded.
2. The grains are fine to medium sized.
3. Contains, mica, quartz, feldspar, amphibole, garnet and pyroxene.
Through which rock do all the properties match?
Our mystery rock is… Yup, it is Schist. We can figure out information about any metamorphic rock with the E.S.R.T.