unit 3 (metamorphic)
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describe metamorphism
when a rock undergoes heat, pressure, or chemically active fluids and changes
main components of metamorphism
Increased heat, increased pressure, chemically active fluids
pressure on rocks is mostly caused by?
the weight of the material above and stress caused by compressional forces
heat is the most important agent of metamorphism because…
it provides the energy to drive the chemical reactions that lead to the recrystallization of minerals
chemically active fluids are important because…
they help move the ions through solid rock
low grade metamorphism results in
small changes to the rock
high grade metamorphism results in
extreme changes to the rock
3 changes that result from metamorphism?
Texture, volume change, and chemical change
metamorphic textures depend on..
crystallization of new minerals and alignment of minerals
non foliated texture is when…
the minerals of a rock are changes creating uniform sized crystals with no visible foliation
foliated texture is
when the minerals of a rock are brought into parallel alignment during metamorphism
when metamorphized LIMESTONE turns into…
marble
when metamorphized SHALE turns into
slate
when metamorphized GRANITE turns into…
gneiss
where does contact metamorphism occur
beneath Laval flows, adjacent to magma intrusions, dikes and sills
where does regional contact metamorphism occur
areas of mountain building and subduction zones