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metamorphic rocks. ESRT page 7. Key ideas. Formed when existing rocks are changed by HEAT & PRESSURE, forming new, larger, denser crystalline structures The new rocks resemble the “parent” rock. Parent rock: Preexisting rock

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key ideas
Key ideas
  • Formed when existing rocks are changed by HEAT & PRESSURE, forming new, larger, denser crystalline structures
  • The new rocks resemble the “parent” rock
slide3

Parent rock: Preexisting rock

  • Recrystallization: A process in which rocks undergo change without truly melting
more key ideas
More Key Ideas
  • IMPORTANT- THE ORIGINAL ROCK CANNOT MELT WHEN IT BECOMES METAMORPHIC! (If it melts, it’s igneous!)
  • Metamorphism
slide7
CONTACT
  • Magma touches layers of rock and the HEAT causes the rock layers to change
the bells whistles for metamorphic rock identification
the bells & whistles for metamorphic rock identification
  • BANDING – alternating layers of different colored minerals due to sorting by density
    • These bands are usually distorted from the heat & pressure
    • not to be confused with sedimentary layers!!!!!!
foliation
FOLIATION
  • FOLIATION – mineral alignment – the minerals in the rock are layered, which facilitates breakage along flat planes- look for “scratches” in the rocks
slide14

More foliation – slate & phyllite

Foliation – note the “scratches” in the rock – this is mineral alignment!

Excellent example of banding & distortion – this is GNEISS 

Banding – mica schist

difference between marble and quartzite
Difference Between Marble and Quartzite

-Both are white in color

  • Marble reacts with HCl acid and quartzite does not
slide17

When I was young, liquid granite I was diagnosed schizophrenic Neither feldspar, nor mica, nor quartz But the sum of the three Bonded igneouslyThat means melted together for life

Well, I was hot and dejected Oh, I was injected Under layers and layers of dirt But, it was there that I changed All my crystals rearranged Into G-N-E-I-S-S, gneiss

So, take a look, and you'll see That I'm not what I used to be I've been touched metamorphicallyAll the heat and the pressure Have changed me forever So don't take me for granite, I'm gneiss

The GNEISS SONG

Well, I wasn't to been seen Until time changed the scene Exposing my face to the sun But, now its here that I sit Being worn down bit by bit Oh, erosion is wearing me down

Refrain

So, be aware, have a look Underground or underfoot For that beautiful pinky-gray face The Canadian shield Holds a magnamous yield Of the rock that was changed into gneiss

Refrain

slide18

Okay…

Let’s sum up!

there are 3 classifications of rocks
There are 3 classifications of ROCKS
  • Igneous – formed by the cooling of magma (melted rock)
  • Sedimentary – formed by compaction & cementation of rock fragments
  • Metamorphic – formed by heat & pressure changing existing rocks
remember the bells whistles when identifying rocks
Remember the “bells & whistles” when identifying rocks!
  • Igneous – obvious crystals of different minerals
  • Sedimentary – stratification, fragments, fossils
  • Metamorphic – foliation, banding