Metamorphic Rocks

what does metamorphic mean

to change

what are the 3 sources of metamorphic rocks

igneous rocks, sedimentary rocks, and pre-existing metamorphic rocks

when do igneous rocks, sedimentary rocks and pre-existing metamorphic rocks become metamorphic rocks

when they’re changed

what are the 3 things metamorphic rocks are classified by

their formation conditions, their texture, and the parent rock they came from

what 2 things change rocks into metamorphic rocks

heat and pressure

3 things that increase temperature for metamorphic rocks

deep burial, plate friction, and intrusion of magma or hot pore fluids

what causes temperature to increase due to deep burial

radioactive decay

how many degrees celsius per kilometers below the earth’s surface due to deep burial

20-30 degrees celsius

what type of metamorphism is deep burial

regional

what causes temperature to increase due to plate friction

friction

how many degrees celsius per kilometers below the earth’s surface due to plate friction

100-300 degrees celsius

what type of metamorphism is plate friction

dynamic/local

what type of metamorphism is intrusion by magma or hot pore fluids

contact/thermal

2 sources of pressure for metamorphic rocks

weight of overlying rocks and transform boundaries

where is overlying rock weight found

convergent boundaries

how many pounds does 1 cubic foot of granite weigh

167 pounds

4 effects of metamorphism on rocks

impurities such as holes and fossils are destroyed, pore space between grains is lost due to compression, rock density increases, and mineral crystals are flattened, enlarged and elongated.

3 types of metamorphism

regional, dynamic, and thermal/contact metamorphism

where does regional metamorphism occur

large areas

what does regional metamorphism occur in response to

deep burial by large areas of rock

what does regional metamorphism occur with

mountain building at collision boundaries

what grades of metamorphic rocks can regional metamorphism have

it can have a range in grade of metamorphic rocks

where does dynamic metamorphism occur, how localized is it, and how fast does it occur

occurs between moving plates, it’s very localized and happens quickly

what's thermal/contact metamorphism and what are 2 examples of fluids that can cause it

Occurs when rock comes into contact with magma or hot pore

fluids like geysers and hot springs