M2odule 08 Part 1 Metamorphic rock identification and interpretation Lab_Quiz_ (Fall 2023) GOL 105 (

11/13/23, 9:54 PM Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz: (Fall 2023) GOL 105 (E81A) - Physical Geology https://learn.vccs.edu/courses/561798/quizzes/4263921 1/33 Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz Due Nov 13 at 11:59pm Points 54 Questions 54 Available Oct 18 at 12am - Nov 13 at 11:59pm Time Limit None Allowed Attempts 3 Instructions Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz Purpose The purpose of completing this lab assignment is to reinforce the concepts presented in this Module and to help you understand the basic criteria used to classify metamorphic rocks and the environments in which they are formed. You'll be bearing in mind some of the lessons of the Minerals, Igneous Rocks, and Sedimentary Rocks lab here, and establishing competence in the final domain of rock identification, building a foundation for the collaborative Rock Identification and Interpretation assignment at the end of this unit. Use this MOD 08_Metamorphic Rocks_ID-key.pdf (https://learn.vccs.edu/courses/561798/files/147273938/download?wrap=1) (https://learn.vccs.edu/courses/561798/files/147273938/download?download_frd=1) classification chart to put names to the different samples. Directions Virtual samples for Metamorphic Rocks (http://opengeology.org/historicalgeology/virtual-sample- sets/vss-metamorphic-rocks/) for this lab are online. The format of these virtual samples is "GigaPans," very large photos that you can explore by zooming in to check out details. You may need Flash installed on your computer in order to view these GigaPans. Examine the specimens in the order specified, bearing in mind additional information that is described in the assignment. Answer the questions to the best of your ability. You have the ability to go back and change your answers before submitting the assignment. There is no time limit, but you cannot save and return later to finish. You must finish each attempt in one sitting. You have 3 attempts to complete the assignment. The highest grade will be saved in Grades for this assignment.

11/13/23, 9:54 PM Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz: (Fall 2023) GOL 105 (E81A) - Physical Geology https://learn.vccs.edu/courses/561798/quizzes/4263921 2/33 Attempt History Attempt Time Score KEPT Attempt 2 37 minutes 45 out of 54 LATEST Attempt 2 37 minutes 45 out of 54 Attempt 1 81 minutes 31.75 out of 54  Answers will be shown after your last attempt Score for this attempt: 45 out of 54 Submitted Nov 13 at 9:54pm This attempt took 37 minutes. Grading This assignment is worth 54 points: 54 multiple choice questions, each worth 1 point. Take the Quiz Again 1 / 1 pts Question 1 Samples A, B, and C are all examples of schist: different kinds of schist, each with distinctive porphyroblasts. Which schist sample is dominated by the mineral muscovite ? Sample A Sample B Sample C All three schists are dominated by muscovite mica.

11/13/23, 9:54 PM Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz: (Fall 2023) GOL 105 (E81A) - Physical Geology https://learn.vccs.edu/courses/561798/quizzes/4263921 3/33 1 / 1 pts Question 2 Samples A, B, and C are all examples of schist: different kinds of schist, each with distinctive porphyroblasts. Which schist sample has porphyroblasts of the mineral garnet ? Sample A Sample B Sample C All three display garnet. 1 / 1 pts Question 3 Samples A, B, and C are all examples of schist: different kinds of schist, each with distinctive porphyroblasts. Which schist sample has porphyroblasts of the mineral magnetite ? Sample A Sample B Sample C All three display magnetite.

11/13/23, 9:54 PM Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz: (Fall 2023) GOL 105 (E81A) - Physical Geology https://learn.vccs.edu/courses/561798/quizzes/4263921 4/33 1 / 1 pts Question 4 Samples A, B, and C are all examples of schist: different kinds of schist, each with distinctive porphyroblasts. Which schist sample has porphyroblasts of the mineral glaucophane ? Sample A Sample B Sample C All three display glaucophane. 1 / 1 pts Question 5 The graphs below compare various combinations of metamorphic temperature / pressure conditions. Different metamorphic rocks form under different conditions. The second graph shows the tectonic interpretation of these different metamorphic "facies." Consider the minerals found in schist samples A, B, and C. Which of the three is an example of blueschist, a rock that forms in subduction zones, where the temperature is relatively low compared to the high pressure? Sample A Sample B

11/13/23, 9:54 PM Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz: (Fall 2023) GOL 105 (E81A) - Physical Geology https://learn.vccs.edu/courses/561798/quizzes/4263921 5/33 Sample C 1 / 1 pts Question 6 Compare samples D and E. "D" is a small sample of rock, about 4 cm across. "E" is an outcrop of rock; a yellow pencil on the outcrop provides a sense of scale. Both "D" and "E" exhibit a distinctive metamorphic texture. What is it? Foliation: slaty cleavage Foliation: schistocity Foliation: gneissic banding Nonfoliation: "fused" texture 1 / 1 pts Question 7 Compare samples D and E again. You identified an important metamorphic texture in the previous question. What is the other feature to be seen in these rocks? gneissic banding porphyroblasts brecciation

11/13/23, 9:54 PM Module 08 Part 1 Metamorphic rock identification and interpretation Lab/Quiz: (Fall 2023) GOL 105 (E81A) - Physical Geology https://learn.vccs.edu/courses/561798/quizzes/4263921 6/33 original sedimentary bedding 0 / 1 pts Question 8 Incorrect Incorrect Compare samples D and E again. You identified an important metamorphic texture and a primary feature of the protolith in the previous questions. What do these features imply about the tectonic history of these two samples? This question has two (2) possible correct answers. You will receive .5 points for each correct answer and lose .5 points for each incorrect answer selection. The rocks experienced low grades of metamorphism. The rocks experienced high grades of metamorphism. The rocks experienced confining pressure only. The rocks experienced differential stress. 0 / 1 pts Question 9 Incorrect Incorrect Refer once again to samples D and E. Which of the following is the best interpretation for these rocks?

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