metamorphic rocks Flashcards
change in rocks my adding/removing temp and psi
metamorphism
gneiss
eclogite
high temp/med psi
high psi/low-temp,old coal/bassalt at subduction zones
parent rock (again
things driving metamorphism
subduction, inc psi/temp
shallow rocks are metamorphized
low geothermal gradient
agents of metamorphism
-pressure/stress
(burring a sedimentary rock on coast and it gets deeper thickening the layers)
-differential stress (from convergence, deforms and folds rocks)
-compressional stress (rocks squeezed, shportned in direction)
-temp
-geothermal gradient
fluids (
metaconglomerate
under higher temp/
she asks question about which way the pressure was, can tell byulooking which way rock is squished
heat is most imporant agent in metamorphism
describe hopw this works
recrystallization in new minerals\
contact metamorphism= heat from magma, small area
regional metamorphism= convergence, big scale changes in geothermal gradient
naming metamorhic rocks
texture, size, shapes, mineral arrangeent, minerals
new term: pholiation, what is it?
hint: pages in an art book are called art folios
what deos minerals in metamorphic rocks:
allignment of minerals from random orientation of rocks
says what used to be and turned into
more on foliation
what is the relationship \btw allignment and foliation
perpendicular to direction of the force
what is the beginning of foliation called
slaty cleavage, turns into slate
tendancy to slip along parallel planes
schist
clay turns into mica
keep metamorhising it it tuens into a
gneiss
what does marble metamorphise from
limestone
