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Please copy into your IAN! Metamorphic Rocks Chapter 4. 4 Objectives: 1. Describe two ways a rock can undergo metamorphism. 2. Describe the difference between foliated and nonfoliated metamorphic rock.
n n I. Complete Change in Shape A. Caterpillar > Butterfly B. Dry cookie dough ingredients > Gooey Cookies II. Origins of Change (2 step process) A. Heat B. Pressure C. Two Categories! 1. Contact a. b. 2. Regional a. b. Silly Putty example ( stretch bands into rocks 30 x the size)
III. Composition A. Original Minerals become new! 1. Index Minerals (Chlorite, Mica, Garnet) 2. Example Below!
n Please open your IAN to your Metamorphic Rocks notes/Roman Outline n Review the 2 classifications of these rocks.
! e r u IV. Textures A. Foliated 1. Bands or Planes & t r P s s e a e H 2. Schist Mica, Chlorite, Gneiss, Slate 3. Shale (sed) =Slate (Meta) 4. Slate (meta) = Phyllite (meta) 5. Phyllite (meta) = Schist Mica (meta) = Gneiss! B. Nonfoliated
B. Nonfoliated 1. No Bands, not aligned, scattered 2. Crystallization occurs 3. Sandstone + Quartz = Quartzite 4. Limestone + Calcite = Marble V. Structures A. Deformation: _____(Silly Putty) 1. Squeezed or Stretched 30 x the size 2. Creates folds and bands
In Summary: Metamorphic Rocks n Meta. Rocks occur when the structure, texture or composition has changed. n Heat and pressure can change the existing minerals into new minerals. n Metamorphic rock structures are caused by deformation. (silly putty)
Metamorphic Classification n Contact metamorphism: Happens when rock comes in very close contact with a magma chamber. This forms more from heat than pressure. (pancake batter) n Regional metamorphism: happens when rock is under tremendous pressure from plate tectonics. Forms more from pressure than heat. (peanut butter cookies pressed with a fork)
2 Types of Texture n Foliated – the texture of metamorphic rock in which the mineral grains are arranged in planes or bands. – Examples : Slate, gneiss n Nonfoliated – the texture in which the mineral grains are not arranged in planes or bands – Examples: quartzite, marble
Basics: Which are nonfoliated?
We heard it, we did it, now let’s see it again! n Metamorphic n Now Rocks Review let’s review our lab and analyze our qualitative observations!
3 bullets each Physical Properties (include the phase of matter) Ingredient Earth Ingredient Sprinkles / M&Ms Water - solid -dry -light weight -small particles Final Observation (what did the ingredient look like in the end) (What real substance under the surface of the earth does Did it change? this ingredient remind you of & why!) pancake mix Dependent Variable (y) (YES or NO) HOW did it change? (Disappear? Melt? include color and phase) - - raisins - marshmallows - chocolate morsels -
Kaolin (Gray) Marble Schist Mica Coal Olivine Pyrite Slate
Conclusion: (Write your OWN paragraph using starters) 30 pts Where would you find these sentence starters? Remember paragraph form with a topic sentence.