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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.
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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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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 7/33 These rocks were subducted, as evidenced by the blueschist mineral glaucophane. They were likely on some oceanic crust that was metamorphosed under high pressure but low temperature conditions. These rocks were subjected to differential stress during mountain building, causing them to develop metamorphic foliation in the form of slaty cleavage. However, they were not too throughly recrystallized, which is why we can still see primary sedimentary bedding. Hence, these rocks were probably on the fringes of a mountain belt. These rocks were subjected to confining pressure during an episode of rifting. Magma intrustions baked them into contact metamorphic rocks. The rocks were throughly recrystallized. These rocks were subjected to intense differential stress during mountain building, causing them to develop metamorphic foliation in the form of gneissic banding .They were throughly recrystallized at temperature / pressure conditions near the solidus, which is why we can see evidence of partial melting. Hence, these rocks were probably in the heart of a mountain belt. 1 / 1 pts Question 10 Compare samples "F" and "G." There is a scale bar (in centimeters) at the top of the "F" image. The scale of "G" is indicated by the red pen. Both samples show dark and light stripes, but this striping has different causes. In one, it's original sedimentary bedding viewed in cross-section on the surface of a slate cleavage plane. In the other, the striping is gneissic banding, viewed in cross-section. Which sample, F or G, is the result of higher-grade metamorphism?
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 8/33 "F" is higher grade, since it is fine-grained. "G" is higher grade, since it is coarse-grained. 1 / 1 pts Question 11 Compare samples "F" and "G" again. There is another line of evidence that suggests the one is much more metamorphosed than the other. What is it? Folding Garnet porphyroblasts Metamorphic aureole 1 / 1 pts Question 12 Examine sample H. This sample is 20 cm across. Is it foliated or nonfoliated? Foliated Nonfoliated 1 / 1 pts Question 13
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 9/33 Describe the shape of the large grains of quartz (light colored) in sample H. Angular Moderately rounded Well rounded 1 / 1 pts Question 14 Consider sample I. This sample's scale is indicated by the centimeter markings on the scale card. Is the rock sample foliated or nonfoliated? Foliated Nonfoliated 1 / 1 pts Question 15 Describe the shape of the large grains of quartz (light colored) in sample I. Angular Moderately rounded Well rounded
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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 10/33 1 / 1 pts Question 16 Compare samples H and I. One is a metaconglomerate. The other is a metabreccia (fault breccia). Which is which? Match the sample letter to the correct identification below: Sample H Metaconglomerate Sample I Metabreccia (fault brecc 1 / 1 pts Question 17 Interpret sample H. There was once a deposit of limestone which was later metamorphosed under differential stress, resulting in this foliated marble. It indicates passive margin sedimentation on a carbonate bank followed by orogeny (mountain-building). There was once a deposit of limestone which was later metamorphosed under confining pressure, resulting in this nonfoliated marble. It indicates passive margin sedimentation on a carbonate bank followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body. There was once a deposit of conglomerate which was later metamorphosed under differential stress, resulting in this foliated metaconglomerate. It indicates depostion of gravel in a high-energy river current followed by orogeny (mountain-building).
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 11/33 There was once a deposit of conglomerate which was later metamorphosed under confining pressure, resulting in this nonfoliated metaconglomerate. It indicates depostion of gravel in a high-energy river current followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body. There was once a breccia that formed in a fault zone and was later metamorphosed under differential stress, resulting in this foliated metabreccia. It indicates faulting (brittle behavior at shallow depths in the crust) followed by orogeny (mountain-building). There was once a breccia that formed in a fault zone and was later metamorphosed under confining pressure, resulting in this nonfoliated metabreccia. It indicates faulting (brittle behavior at shallow depths in the crust) followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body. There was once a deposit of muddy sandstone which was later metamorphosed under differential stress, resulting in this foliated schist. It indicates passive margin sedimentation on a beach followed by orogeny (mountain-building). There was once a deposit of muddy sandstone which was later metamorphosed under confining pressure, resulting in this nonfoliated quartzite. It indicates passive margin sedimentation on a beach followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body. 1 / 1 pts Question 18 Interpret sample I.
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 12/33 There was once a deposit of limestone which was later metamorphosed under differential stress, resulting in this foliated marble. It indicates passive margin sedimentation on a carbonate bank followed by orogeny (mountain-building). There was once a deposit of limestone which was later metamorphosed under confining pressure, resulting in this nonfoliated marble. It indicates passive margin sedimentation on a carbonate bank followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body. There was once a deposit of conglomerate which was later metamorphosed under differential stress, resulting in this foliated metaconglomerate. It indicates depostion of gravel in a high-energy river current followed by orogeny (mountain-building). There was once a deposit of conglomerate which was later metamorphosed under confining pressure, resulting in this nonfoliated metaconglomerate. It indicates depostion of gravel in a high-energy river current followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body. There was once a breccia that formed in a fault zone and was later metamorphosed under differential stress, resulting in this foliated metabreccia. It indicates faulting (brittle behavior at shallow depths in the crust) followed by orogeny (mountain-building). There was once a breccia that formed in a fault zone and was later metamorphosed under confining pressure, resulting in this nonfoliated metabreccia. It indicates faulting (brittle behavior at shallow depths in the crust) followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body.
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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 13/33 There was once a deposit of muddy sandstone which was later metamorphosed under differential stress, resulting in this foliated schist. It indicates passive margin sedimentation on a beach followed by orogeny (mountain-building). There was once a deposit of muddy sandstone which was later metamorphosed under confining pressure, resulting in this nonfoliated quartzite. It indicates passive margin sedimentation on a beach followed by either burial metamorphism in a sedimentary basin or contact metamorphism by an intruding magma body. 1 / 1 pts Question 19 Compare the outcrop in Sample "J" to the previous two samples, "H" and "I." A sense of the scale of the image is provided by the yellow pencil and the scale card. Does sample J more closely resemble H or I? Why? Sample J seems more like H: both have well-rounded grains of light- colored quartz. Sample J seems more like I: both have angular grains of light-colored quartz. 0 / 1 pts Question 20 Incorrect Incorrect
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 14/33 What is the principle difference between the rock making up samples I and J? Different clast composition Different matrix (cement) composition Different clast shape One is foliated; the other is nonfoliated. 1 / 1 pts Question 21 Compare samples K and L. Note that for each rock sample, two GigaPan views are provided. One of these samples is a fault breccia; the other is a mylonite. Review the characteristics of fault breccia and mylonite with this SmartFigure video (http://media.pearsoncmg.com/bc/bc_0media_geo/smartfigure/mylonite-vs- fault-breccia.html) . Which of these two samples, K or L, is the mylonite? Why? K is the mylonite. It has chunks of garnet in it. K is the mylonite. It has angular clasts and slickensides on the lower surface of the sample. L is the mylonite. It has chunks of garnet in it. L is the mylonite. It displays "augen" of several minerals, with "tails" that stretch out parallel to the foliation.
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 15/33 1 / 1 pts Question 22 Which of these samples, K or L, formed under brittle conditions? K; the rocky chunks in it are crushed up and angular L; the rocky chunks in it are smeared out - evidence of ductile flow 1 / 1 pts Question 23 Select the zone - A or B - where sample K formed: A B
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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 16/33 1 / 1 pts Question 24 Select the zone - A or B - where sample L formed: A B 0 / 1 pts Question 25 Incorrect Incorrect Review what your textbook has to say about serpentinite, a metamorphic rock dominated by the mineral serpentine. Sample M is serpentintite. What is the mineral habit of the serpentine you can see in sample M?
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 17/33 cubic hexagonal prisms asbestiform sheets 1 / 1 pts Question 26 Select the zone (metamorphic environment) where Sample M would have formed.
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 18/33 A
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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 19/33 B C 1 / 1 pts Question 27 Examine sample N. Is it foliated or nonfoliated? Foliated Nonfoliated 1 / 1 pts Question 28 Examine sample N. This rock would NOT effervesce (fizz) if you put hydrochloric acid (HCl) on it. Identify the rock. metaconglomerate quartzite marble hornfels 1 / 1 pts Question 29 What is the protolith of sample N?
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 20/33 conglomerate quartz sandstone limestone shale 1 / 1 pts Question 30 Examine sample O. Is it foliated or nonfoliated? Foliated Nonfoliated 0 / 1 pts Question 31 Incorrect Incorrect Examine sample O. This rock would effervesce (fizz) if you put hydrochloric acid (HCl) on it. Identify the rock. metaconglomerate quartzite marble hornfels
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 21/33 1 / 1 pts Question 32 What is the protolith of sample O? conglomerate quartz sandstone limestone shale 1 / 1 pts Question 33 Compare samples N and O again. You identified rock mineralogy as well as an important metamorphic texture in the previous questions. What does this 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. Original sedimentary deposits included quartz sand only. Original sedimentary deposits included both quartz sand and lime mud. The rocks experienced confining pressure only. The rocks experienced differential stress.
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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 22/33 1 / 1 pts Question 34 Examine samples P1 and P2. Are they foliated or nonfoliated? Foliated Nonfoliated 1 / 1 pts Question 35 Identify sample P1, noting its dull luster. slate phyllite schist gneiss migmatite 1 / 1 pts Question 36 Identify sample P2, noting its shiny luster and wavy foliation. slate phyllite schist
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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 23/33 gneiss migmatite 1 / 1 pts Question 37 What is the protolith of samples P1 and P2? conglomerate quartz sandstone limestone shale 1 / 1 pts Question 38 If samples P1 and P2 were subjected to further progressive regional metamorphism, what rock be formed next? schist metaconglomerate migmatite mylonite anthracite marble
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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 24/33 1 / 1 pts Question 39 Consider sample Q. Is it foliated or nonfoliated? Foliated Nonfoliated 1 / 1 pts Question 40 Consider sample Q. Is it fine-grained or coarse-grained? fine coarse 1 / 1 pts Question 41 Identify sample Q, noting the textural features you identified in previous questions. slate phyllite schist gneiss migmatite
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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 25/33 1 / 1 pts Question 42 You identified important aspects of sample Q's metamorphic texture in the previous questions. What do these features imply about the tectonic history of this sample? 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. 1 / 1 pts Question 43 Which of the following is the best interpretation for sample Q? This rock was subducted, as evidenced by the blueschist mineral glaucophane. It was likely some oceanic crust that was metamorphosed under high pressure but low temperature conditions.
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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 26/33 This rock was subjected to differential stress during mountain building, causing it to develop metamorphic foliation in the form of slaty cleavage. However, it was snot too throughly recrystallized, which is why we can still see primary sedimentary bedding. Hence, this rock was probably on the fringes of a mountain belt. This rock was subjected to confining pressure during an episode of rifting. Magma intrustions baked it into contact metamorphic rocks. The rock was throughly recrystallized. This rock was subjected to intense differential stress during mountain building, causing it to develop metamorphic foliation in the form of gneissic banding. It was throughly recrystallized at high temperature / pressure conditions. Hence, this rock probably formed in the heart of a mountain belt. 1 / 1 pts Question 44 Consider sample R. Is it foliated or nonfoliated? Foliated Nonfoliated 0 / 1 pts Question 45 Incorrect Incorrect Consider sample R. In many places, it shows blobs of light-colored, coarse-grained material. It's white and peach colored, with gray transparent mineral matter too. What is this material?
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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 27/33 garnet granite glaucophane grenache 1 / 1 pts Question 46 Regarding yoru answer above (sample R), so what? In other words: what process has this rock undergone? Hydrothermal alteration Faulting Partial melting (mafic material melts to form magma; felsic material remains solid) Partial melting (felsic material melts to form magma; mafic material remains solid) 0 / 1 pts Question 47 Incorrect Incorrect Identify sample R, noting the textural features you identified in previous questions. slate
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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 28/33 phyllite schist gneiss migmatite 1 / 1 pts Question 48 Examine the four specimens in sample set S. These are metamorphic index minerals. Are minerals the same thing as rocks? Yep. And "elements" is yet another synonym for Earthy stuff. No. Minerals are the building blocks of rocks. 0 / 1 pts Question 49 Incorrect Incorrect The GigaPan of sample set S shows a collection of four different mineral samples. These are common metamorphic index minerals : minerals found in metamorphic rocks that indicate a particular set of metamorphic conditions. From left to right, let's call them S1, S2, S3, and S4. Use the following metamorphic index mineral classification Hardness Streak Cleavage Color Distinctive features Name ~ 2.5 White? 1 excellent Dark green 1 excellent cleavage, green color Chlorit
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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 29/33 6-7 White to grey 1 good Light ‘pistachio’ green Dull luster, often occurs in “pods” Epidot > 6.5 None None Reddish- brown; may show rust Forms 12- sided crystals Garne ~ 4.0 White 1 excellent Light blue to grey, often with a rusty surface Breaks into thin, bladed crystals Kyanit > 6.5 None Poor Dull brown Hexagonal prisms, forms crosses Staurol S1 garnet S2 kyanite S3 chlorite S4 staurolite 1 / 1 pts Question 50
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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 30/33 Sample set T was originally one sample, but it was then cut in half and polished. There are three minerals in this rock. First, examine the white / tan mineral. This is the main mineral in this rock. It would effervesce (fizz) if you put hydrochloric acid on it. What mineral is it? calcite quartz garnet chlorite staurolite kyanite 1 / 1 pts Question 51 Continue examining the minerals that make up sample T. Now examine the green mineral. This is the second most common mineral in this rock, imparting the prominent green stripes to the rock. It is a metamorphic index mineral (one of the ones you saw in the previous sample set, "S"). What mineral is it? calcite quartz garnet chlorite staurolite kyanite
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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 31/33 1 / 1 pts Question 52 Continue examining the minerals in sample T. Now it is time to examine the dark red mineral. This is the least common mineral in this rock. It is a metamorphic index mineral (another one of the minerals that you saw in the previous sample set, "S"). What mineral is it? calcite quartz garnet chlorite staurolite kyanite 0 / 1 pts Question 53 Incorrect Incorrect Given the presence of these two metamorphic index minerals in sample T, pick the number on the chart below that best corresponds to the rock's position and metamorphic grade:
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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 32/33 (Note the blue numbers running along the bottom: pick the one of these numbers that best matches the mineralogy of this sample.) Parent Rock Low grade Low grade Low grade Low grade Intermediate grade Intermediate grade Intermediate grade Intermediate grade Intermediate grade Intermediate grade / high grade High grade
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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 33/33 High grade High grade High grade 1 / 1 pts Question 54 What is the protolith of sample T? conglomerate quartz sandstone limestone layers interbedded with layers of shale granite Quiz Score: 45 out of 54
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