1GLY4310Name 52 pointsFebruary 8, 201018 took examFlorida Atlantic UniversityPETROLOGY -- MIDTERM ONE KEYTrue-False- Print the letter T or F in the blank to indicate if each of the following statements istrue or false. Illegible answers are wrong. (1 point each)4F 1. A biotite-hornblende granite contains more biotite than hornblende. 3F 2. In the IUGS classification scheme, the letter F refers to feldspars, including alkali andplagioclase.8T 3. If a rock is found in the middle of the QAP part of the IUGS diagram, it is silicaexcessive.2T 4. If a rock has P + M > 90%, it should be classified using the “gabbroic” diagram. 2T 5. Rocks with an aphanitic texture are composed of either glass, or crystals too small to beseen with the unaided eye, or a mixture of these two.0F 6. During nucleation, the surface area/volume ratio is low.1T 7. In a magma chamber lacking magma movement, the rate of diffusion controls the rateof dissipation of the heat of crystallization.1F 8. Systems in which the cooling rate is rapid usually maintain equilibrium. 9T 9. As they travel deeper in the mantle, the velocity of both P and S waves increases.9F 10. Pyrophyllite is a dioctahedral triphormic phyllosilicate. There are two layers in thestructure, one tetrahedral, and one octahedral. Multiple-Choice- Choose the best response to each statement or question. Print the lettercorresponding to your choice in the blank. (1 point each)8B 1. Large crystals formed by relatively slow cooling of magma below the earth’s surfaceare called:A. PhaneriticB. PhenocrystsC. PyroclastsD. Xenocrysts
has intentionally blurred sections.
Sign up to view the full version.