Lec 9

Can any rock turn into any rock with the correct conditions

True

Is it shale or slate

shale

is it shale or slate

slate

what is it

schist

is it gneiss or schist

schist

igneous sedimentary or metamorphic rock

metamorphic

what temp does metamorphism begins

200C

what temp does melting begin

700C

What depth does metamorphism being

5-8km

What are factors controlling metamorphism

1.Composition of parent rock

2.Temp

3.Pressure

4.Chemically active fluids

what’s the main impact of temperature

recrystallization

What’s the difference between confining and direct pressure

confining equal as in uniform direct pressure is not equal in all directions

ductile deformation is caused from which pressure confining or differential

differential pressure

what does recrystallize come from which pressure

Confining

What is ductility

the ability for the material to stretch

what pressure is metamorphic rock

differential

what type of pressure is 1 and 2 and which is the change due to pressure for 1 and 2

1. Confining and recrystallization 2. differential and ductile deformation

will having fluid cause metamorphism

yes

what type of metamorphism is ABC

A. contact meta (mainly heat)

b.Dynamic meta (pressure)

C. Regional (heat and pressure)

if its far from magma pressure is high temp is low

ShorteningD

Stretching

Sliding and tearing

What would be a real life material for these

Elastic Deformation

Ductile deformation

Brittle deformation

Rubber

Steel

Glass

is elastic deformation permanent change

no

What’s another example of brittle deformation and how can you recognize brittle deformation

Concrete and you cant recognize deformation it fractures immediately

Can Glass bend rather than rupture and at what condition

yes heat brittle can be ductile

whats a stronger rock igneous or metamorphic

Igneous

Factors affecting deformation

Stress type

temp

confining pressure

rock type

time(rate of deformation)

Why can the same rock fold and other fracture it was subjected to same pressure and similar composition

temperature and confining pressure

Does a rock being near surface and at depth affect the ability to fold or fracture

if near surface temp low it fracture if at depth high temp it will fold

Whats the difference between faults and joints

layer displacement and joint no layer displacement just crack

displacement fold

joint

fracture and displace

joint

shallow or deep

deep

shallow