Metamorphic Rocks
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Every metamorphic rock has ___
a parent rock
Metamorphism occurs from low-high grade. List the rocks in order from low-high grade
Slate - Phyllite - Schist - Gneiss
shale ->
slate
granodiorite ->
folded gneiss
2 methods of metamorphism:
contact and regional
Contact metamorphism:
Magma heats the adjacent rock to temperatures that cause metamorphic changes
Regional Metamorphism:
During mountain building, rocks are subjected to high temperatures and pressures
Mudrock ->
Schist
Limestone ->
marble
Sandstone ->
Quartzite
Foliated rocks
Slate, phyllite, schist, gneiss
Nonfoliated rocks
marble, quartzite
What are kimberlites?
Kimberlites are rare, volatile-rich, ultramafic igneous rocks from the Earth’s mantle, known primarily as the main source rock for most natural diamonds,
Pegmatites
coarse-grained igneous rocks deep in Earth’s crust, which contain valuable minerals such as tourmaline, beryl, and lithium
Impact/Shock Metamorphism
caused by immense pressure and heat from an asteroid/meteorite impact (causes the formation of high-pressure materials such as ooesite and stishouite)
migmatites
metamorphic rocks that show sign of partial melting
Barrovian metamorphisim
chlorite - biotite - garnet - staurolite - kyanite- silimanite (zones)