Class Notes (838,242)
Canada (510,788)
EASC 101 (3)

Oct.3- CH.9

3 Pages
Unlock Document

Earth Sciences
EASC 101
Glyn Williams- Jones

Ch.9- Metamorphic Rock -One rock into another (pressure, temp +composition) - no/very little melting involved -Parent Rock (or protolith) the following are "process" metamorphic this occurs at surface and at depth igneous sedimentary metamorphic Factors controlling metamorphism Fluids -> volatiles (C02), enhances migration of ions (helps with recrystalization) Sources of fluids Pore spaces of sedimentary rocks fracture in igneous rocks Hydrated minerals (clay & mica) Time Crystallization, recrystallization & chemical reactions are slow (millions of years) Longer the time the bigger the crystals Temperature Most important agent Recrystalilizations-> new stable mineral (geothermal) Two sources of heat: igneous intrusion, increase temperature with depth -> geothermal gradient (20-60 degrees Celsius/km, 30-450 degrees Celsius at 15km) Pressure increase with burial depth confining pressure applied equally in all directions (uniform pressure) differential stress -> when unequal in different directions TEXTURE: size, shape, and arrangement of grains with rock FOLIATION: any planar arrangement of mineral/grains of structural features within rock Low grade-> high grade Slaty cleavage-> schistosity-> gniessic Increase temperature + pressure (depth)-> foliation Increase temp but not pressure-> non foliated Subduction zone metamorphism-> dragging down (describes environment at depth) Burial metamorphism can occur in two ways: contact or subduction zone metamorphism NON FOLIATED Non foliated sedimentary rocks is common where only lithost
More Less

Related notes for EASC 101

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.