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NDSU Geosciences Petrology 422/622 Spring 2004 Study Questions for Exam 1 Exam 1 will cover Winter Chapters 1, 2, 4, 5, 6, and 7.1 through 7.4. Optical mineralogy will be covered in the lab quiz. Below are some sample questions and topics. You collect fine-grained rocks (a basalt, a rhyolite) and a glassy rock (obsidian). How do you classify these samples using a Q-A-P-F diagram? (Winter, p. 23) Discuss the basis of the Chondritic Earth Model. What is a pyroclastic rock? How is it formed? Contrast landforms you would expect to find due to subaerial basaltic volcanism with those due to a) subaqueous basaltic volcanism, and b) subaerial silicic volcanism. For the Fo-An-Di ternary system, write a complete narrative of the crystallization history for a liquid of arbitrary composition. Apply the phase rule to interpret the phase relations. (Winter Ch. 7) Discuss and draw supporting diagrams on: the structure and composition of the Earth G vs T (at constant P) for solid and liquid phases of a substance. zoning of plagioclase feldspars during equilibrium vs. non-equilibrium crystallization (remember we discussed this at the end of mineralogy, too) difference between the composition of liquid produced by melting a forsterite-enstatite rock at high pressure and low pressure. (Winter, p. 101-102) difference between crystallizing alkali feldspars at high and low pressure. (Winter, p. 102-104) As you prepare by reviewing the text and your notes, think up similar questions.

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