4. Arrange the following metamorphic rocks according to their metamorphic grade: augen gneiss, mica schist, migmatite, and slate.

Assignment 2: Sedimentary and Metamorphic Rocks
This assignment is marked out of 100 and is worth 10 per cent of your final grade for the course. Please answer the following questions in the spaces provided or on additional paper as required. Marks are as indicated. When you are finished, make a copy of your assignment and send the original to your Open Learning Faculty Member.
Part 2—Sedimentary and Metamorphic Rocks
(20 Marks)
To answer the questions in this section you should refer to the section on identification of sedimentary and metamorphic rocks in Unit 2, and Chapters 6 and 7 of the course text.
1. Have the following rock types experienced a long or short transport history during their formation? For each, give two reasons to support your answer.
Conglomerate (2 marks)

Arkose (2 marks)

Quartz Arenite (2 marks)

2. In what type of environment did the following rock types form?
Rock Gypsum (2 marks)

Oolitic Limestone (2 marks)

Coal (2 marks)

3. Define the following terms:
Fossil (1 mark)

Index Fossil (1 mark)
4. Arrange the following metamorphic rocks according to their metamorphic grade:
augen gneiss, mica schist, migmatite, and slate. (2 marks)
Highest grade:

Lowest grade:

5. Arrange the following metamorphic rocks as you would expect to find them as you approached an igneous intrusion (i.e., the source of contact meta-morphism):
marble, granodiorite, and limestone. (2 marks)
Country Rock Aureole Intrusion

6. Describe how basalt would change as it underwent progressive regional metamorphism. (2 marks)

Part 3—Field Exercise
(20 marks)
7. This exercise involves fieldwork and some follow-up research at home.
a) Collect a sample of a sedimentary or metamorphic rock from an outcrop, stream bed, beach, or other suitable location. Sandstone, limestone, schist, or gneiss are good examples to look for. A word of caution: streambeds and beaches are not generally good places to find fragments of sedimentary rock because sedimentary rocks tend to be relatively weak and soft and they get quite quickly ground up in high-energy environments. On the other hand, you might find metamorphic rocks, such as gneiss or schist in the gravel of a streambed or on a rocky beach.
b) Indicate where the sample was found (e.g., name of river, nearest town, etc.) and briefly describe the sample location (i.e., was the sample collected from a rock outcrop, stream bed, beach, etc.). On the following page include a sketch or photograph of the sample site, remembering to show a measure of scale such as a notebook, hammer or person, and where the sample site is located.
(5 marks)
Site Description

Sketch or Photo of Sample Site

Please use additional pages if needed.
Please reference any additional maps and
other sources of information that you use.
c) Describe sample texture and composition. Break the sample in half and send half to your Open Learning Faculty Member so that your analysis can be checked. Keep the other half for yourself for future reference.
Texture
Describe the overall appearance of the sample and its colour, the range of grain sizes, grain shape, and structures (such as bedding or foliation) visible in hand specimen.
(4 marks)

Composition
Estimate the percentage proportions of minerals in your sample. (4 marks)

d) Provide a name and briefly outline the geological history of your specimen. Compare your sample with the descriptions and classification of sedimentary and metamorphic rocks in your textbook and Lab Manual.
Name (2 marks)

Geologic History (5 marks)
Briefly describe the history of how your rock sample formed and how it got to where you collected it.

Please use additional pages if needed.
Please reference any additional maps and
other sources of information that you use.
Part 4—Relative Dating
(10 marks)
Photograph 25 in the GEOL 1011 Photo Poster shows a sequence of igneous and metamorphic rocks found at Caulfeild Park in West Vancouver. The rocks could be briefly described as follows:
a) Light grey fine-grained porphyritic volcanic rock with black needle-like phenocrysts of hornblende.
b) Distinctly folded black and white banded and foliated metamorphic rock composed of quartz and feldspar (light bands), and hornblende and plagioclase feldspar (dark bands).
c) Thin veins of white quartz.
d) Black and white speckled (but appears mostly white in photograph) coarse-grained igneous rock composed primarily of quartz, orthoclase feldspar, sodium plagioclase, and biotite mica.
8. In the space below, draw a sketch of the photograph (not a copy of the photo) showing the four rock types; label them a, b, c, and d as described above. (5 marks)
9. Using the principle of cross-cutting relationships described in Chapter 8 of the textbook, list the order in which these rocks formed from oldest to youngest. (Hint: These are not sedimentary rocks, so the principle of superposition does not apply.) (2 marks)
Oldest Youngest

10. Rock b is folded. Did this folding occur before or after the formation of the other three rock types? What is the evidence for your answer? (1 mark)

11. Provide appropriate rock names for the rock types a to d described above.
(2 marks)
Rock A:
Rock B:
Rock C:
Rock D:
Part 5—Essay Questions
(40 marks)
12. Write a short essay (no more than three pages), giving specific examples where appropriate, explaining why sedimentary rocks are particularly useful in determining past environments (e.g. weathering, erosional and depositional conditions, topography, and climate) and the history of the Earth. You may wish to use other reference sources in addition to the course material (for instance Chapter 6 of the textbook and DVD Track 17: Sedimentary Rocks). (20 marks)
13. Write a short essay (no more than two to three pages) summarizing the most important aspects of the information provided in Chapter 7 (Metamorphism, Metamorphic Rocks, and Hydrothermal Rocks), DVD Track 18 (Metamorphic Rocks), and any relevant parts of the Geoscape Vancouver poster and Geomap Vancouver. (20 marks)

 

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