The Exam: The exam is scheduled for Tuesday, May 16^th, from 10:00am to noon in AB20. The exam will consist of two parts. The first part will deal with metamorphic petrology including lecture material as well as readings from Chapters 18-24 and Appendix #2 from Blatt and Tracy. The second part of the exam will be cumulative for the entire course (igneous, sedimentary, and metamorphic petrology in approximately equal parts). Expect the format to be primarily essay questions and possibly some multiple choice. Each of the two parts of the exam should take ~1 hour to complete.

Metamorphic Section Study Questions
The following questions are intended to give you an idea of the depth and types of questions that may be asked on the metamorphic sections of the exam. This list of questions is not meant to be an exhaustive coverage of all possible topics of questions, nor is it intended to approximate the amount of questions that will ultimately be asked on the exam. Some of these study questions may show up on the exam in a similar or modified form - many will not - but you will benefit from studying them all.

1. Given the following mineral assemblages and textures, identify an appropriate metamorphic rock name, metamorphic facies, and protolith for each rock.

   1. biotite	35%	Texture: gneissic, porphyroblastic
      plagioclase	20%
      quartz	20%
      garnet	10%
      sillimanite	10%
      K-feldspar	5%

   2. glaucophane	60%	Texture: schistose
      epidote	40%

2. How does prograde metamorphism differ from retrograde metamorphism? Give an example of each. Are prograde mineral assemblages more likely to represent the highest temperature or pressure achieved during metamorphism? Why don't retrograde reactions commonly occur?
3. What mineral zones did Barrow use to define increasing metamorphic grade in pelitic rocks in Scotland? What types of textures would you expect to find in pelitic rocks undergoing regional metamorphism? How do these textures change with increasing grade of metamorphism? What is the origin of these textures?
4. On the accompanying P-T diagram, label the regions of the following metamorphic facies: blueschist, eclogite, granulite, greenschist, amphibolite. Were these facies originally defined based on mafic, pelitic, or calcareous rocks? Draw and label a reaction curve with the appropriate shape for a generalized prograde dehydration reaction (A + B => C + H₂O).
5. What type of metamorphism is commonly associated with mid-ocean spreading ridges? Give an example of a type of mineral reaction that commonly occurs in this setting. Give two examples of metamorphic rocks that might be formed in association with a subduction zone. Explain how each reflects the P-T conditions present in this type of plate tectonic setting.

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