Download Metamorphic Rock

4-4 pgs. 95-99
•IN:
What are some ways
that sedimentary rock can
form? Can you classify the
four we looked at?
sedimentary
compaction,
rock
cementation
metamorphic
rock
sediment
igneous
rock
magma
 Rocks
in which the structure,
texture, or composition of the
rock has changed.
 Heat

and/or pressure.
Metamorphism does not melt rockwhen rock melts, it becomes magma
and then igneous rock.
 Metamorphic
change takes place
at depths greater than 2 km.
 The
temperature at which
metamorphism occurs ranges
from 50oC to 1,000oC.
 Contact
◦ In contact with magma.
 Regional
◦ Heat and pressure cause rock to
chemically change.
 When
rock comes into contact
with magma.
 When
enormous pressure builds
up in rock that is deeply buried
under other rock formations, or
when large pieces of the Earth’s
crust collide.
 The
mineral composition of a rock
changes when the minerals it is
made of recrystallize to from new
minerals.
 Some
metamorphic minerals form
only within specific range of
temperature and pressure
conditions.
◦ Muscovite mica
◦ 700oC
◦ 5-34 km
 Many
of these new minerals occur
only in metamorphic rock.
◦ Chlorite
◦ Muscovite mica
◦ Garnet
 Foliated
◦ Contain aligned mineral grains.
 Nonfoliated
◦ Do not contain aligned minerals
grains.
 Metamorphic
rock can become
other metamorphic rocks if the
environment changes again.
◦ shaleslatephylliteschistgneiss
 Made
of only one, or just a few,
minerals.

Metamorphic rock formed from shale
and used for tiling.
◦ Foliated

Metamorphic rock that is formed from
slate metamorphosing again.
◦ Foliated

Metamorphic rock formed from the
igneous rock granite.
◦ Foliated

Metamorphic rock formed from
limestone and used for sculpture.
◦ Non-foliated
◦ Sandstone  Quartzite
◦ Limestone  Marble
◦ Shale  Slate
◦ Granite or Shale  Gneiss
OUT:
What some
features of
metamorphic rocks?