4310FE_S10_KEY - GLY4310 88 points 18 took exam Name...

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1 GLY4310 Name 88 points April 30, 2010 18 took exam Florida Atlantic University PETROLOGY -- FINAL EXAMINATION KEY Scores to the left of the answer in red are the number of incorrect responses. Instructor comments and answers are in blue . Questions in gray , with answers marked NG, were duplicates and were not graded. True-False - Print the letter T or F in the blank to indicate if each of the following statements is true or false. Illegible answers are wrong. (1 point each) 0 T 1. The largest difference between orogenic metamorphism and burial metamorphism is the lack of significant structural deformation during burial metamorphism. 0 T 2. Many orogenic episodes produce repeated episodes of deformation and metamorphism, leaving a polymetamorphic imprint. 2 F 3. All minerals show the transition from brittle to ductile under very similar conditions. 1 F 4. Prograde metamorphic reactions are exothermic. 3 T 5. Barrow found a much greater change in the pelitic rocks he studied, compared to the sandstones. 1 T 6. It is possible for an index mineral to be present in a zone of higher grade than its own. 0 F 7. When andalusite is present, the pressure at the time of formation exceeded 0.4 GPa. 0 T 8. At very low metamorphic grade, reaction rates are slow. 1 T 9. Ca-bearing minerals, like laumonite, prehnite, and pumpellyite are stable in water- rich, carbonate-free fluids. 2 F 10. The Franciscan belt lies nearer the former subduction zone than the Sierra belt. The Sierra belt is richer in alkaline elements than the Franciscan belt. 2 F 11. Ordinary prograde metamorphic reactions are common in high-temperature mafic igneous rocks. 1 F 12. The original facies classification was based primarily on metamorphosed felsic rocks. 2 T 13. There is little difference in mafic rock facies that develop at low, medium, or even high pressure.
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2 1 T 14. If equilibrium is maintained, there is a correlation between the An content of plagioclase and the temperature at which metamorphism was occuring. 1 T 15. Hydrous pelitic and quartzo-feldspathic rocks do not reach granulite grade. 0 T 16. Eclogites span a greater temperature range than any other facies. 3 F 17. Greenschist-amphibolite facies, such as those of Western North Carolina, require an average continental crustal geotherm to form. 1 F 18. For most P-T-t paths, P max and T max occur at the same time. 4 F 19. Counterclockwide P-T-t paths are found only in granulite facies rocks. 0 F 20. Metamorphic grade is most closely related to P max . 2 T 21. In a Buchan sequence, oligoclase appears before hornblende. 2 F 22. In the low-grade mafic assemblages, complete alteration of the protolith minerals occurs, and it is easy to define new chracteristic mineral assemblages. 1
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4310FE_S10_KEY - GLY4310 88 points 18 took exam Name...

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