Lab 5 Metamorphic Rocks PDF

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Geology 10L:

Name:_______________________ Lab #5 Metamorphic Rocks

Objectives:

1. Identify three basic types of metamorphic rocks: quartzite, marble and schist. 2. Be able to describe how foliation occurs in metamorphic rocks. Part 1 -Formation of Foliation During Metamorphism You will use a clay glitter mixture to model the behavior of solid rock as it forms a rock like schist. The glitter represents the mica and the clay represents the quartz. The clay is much easier to mold than real quartz is; so you can accomplish in a few minutes what it takes Mother Nature millions of years to do. Materials (per group): Handful of plastalena clay Tube of glitter 1. Mix the glitter in with the clay (take turns mixing it in) 2. Work the clay, in any way you wish, to make the glitter particles line up with each other so that the clay/glitter mixture looks like schist. Questions 1. What natural processes could accomplish the same results in rocks?

2. Which of the Metamorphic Rocks at the front of the room are foliated?

Part 2: Metamorphic Rocks, Processes, and Resources From the supplemental reading provided on Canvas: Metamorphic Rocks, Processes, and Resources

2. Explain the following terms or processes:

3. Look at figure 7.1 on pg. 188 of the supplemental reading. List the four rocks shown that the parent rock shale can turn into in order of increasing metamorphic grade:

4. How about the limestone in figure 7.1, what does the limestone turn into over the same change in metamorphic grade that affected the shale?

Part 3: Agents of Metamorphism Refer to the supplemental reading pages 6. Explain the following terms or processes:

7. Figure 7.6 on pg. 192 (supplementary reading) shows the index minerals that appear when shale is metamorphosed to increasing grades. Please cross out hornblende on that figure , hornblende is NOT an index mineral seen in rocks with a shale parent rock. Part 4: Minerals and Textures of Metamorphism Refer to the supplemental reading pages 8. Explain the following terms or processes:

Part 5: Common Metamorphic Minerals Minerals that most commonly occur in metamorphic rocks include: quartz, plagioclase feldspar, potassium feldspar, calcite, biotite, muscovite, talc, amphibole, garnet and serpentine. Identify the mineral samples labeled 1A-1J. Use the mineral identification charts page 90-92 (provided) if you get stuck.

Part 6: Classification of Metamorphic Rocks Describe and identify samples R25-R32 in the rock identification box. Larger examples of these samples are also available in the front of the room for you to examine. For each sample, complete a line on the Metamorphic Rock Table (provided on canvas).

Part 7: Extra Credit Study the Supplemental Material and the information given in question C, on page 206, then answer the following questions: 1. What is meant by the term facies? 2. Look at the diagram shown below: a. What type of temperature and pressure would you expect at Letter A?

b. What metamorphic facies would you expect to find at Letter A?

c. What metamorphic facies would you expect to find at Letter B?

d. What metamorphic rock would you expect to form at Letter C?...