Metamorphism
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process when rock changes its form into a new one without undergoing melting or disintegration
metamorphism
metamorphic meaning..
changed form
two factors important in metamorphism
heat and pressure
when the hot magma intrudes layers of rock, the rock is changed by heat and pressure; the magma cools but the surrounding rock heats up
contact metamorphism
the zone of metamorphic rock around an intrusive body
metamorphic aureole
____ metamorphic rocks such as marble derived from limestone are formed in this manner (contact metamorphism)
non-foliated
occurs in wide region where rocks are subjected to differential stress due to plate movement
regional metamorphism
regional metamorphism result into
foliated rocks
contact is to? regional is to?
heat pressure
process that transforms a grain of one mineral into a grain of another mineral having the same composition but different crystal structure
phase change
the grains making up the pre-existing rock change shape and size; the identity of the mineral does not change during this process, only the texture
recrystallization
process that creates new minerals with different chemical components
neocrystallization
occurs when some minerals become flattened or elongated without changing either the composition or crystal structure
plastic deformation