Concept #5 Quiz

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Concept #5 Quiz
Choose the best possible answer to the following questions about Key Concept 5 "Metamorphic zones and metamorphic 'grade'."

This activity contains 5 questions.

Indicate where you would expect to find the following metamorphic rocks by selecting the correct response. (Map courtesy of NOAA)

The letters A through C appear on an image associated with this question.

The letters A through C appear on an image associated with this question.

For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
1.1 large areas of greenstone and ancient gneiss	[hint]

1.2 active seafloor alteration of basalts	[hint]

1.3 relatively recent contact metamorphism	[hint]

Why do “new” minerals that did not exist in the “parent rock” form during metamorphism of a rock (e.g., garnet in schist)?

no T and P conditions cause spontaneous weathering and destruction of the rock’s minerals, giving way to new ones“new” T and P conditions cause a change in the stability in the rock’s minerals “similar” T and P conditions cause no change in the stability in the rock’s minerals any of these

Indicate the term for each label on the diagram.

The letters A through B appear on an image associated with this question.

For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
3.1 porphyroblast

3.2 matrix of mica and quartz

What is the significance of metamorphic index minerals? Choose all that apply.

For the same rock chemical composition, different minerals grow at different metamorphic grades as the temperature and pressure changes for that rock.They are used to define “metamorphic zones” by the appearance of the minerals in metamorphic rocks found in the field.Index minerals are such because we interpret them to grow in restricted ranges of temperature and pressure, therefore they “indicate” the metamorphic conditions at which they grow in the metamorphic environment. Index minerals indicate the type of metamorphism that has changed the rock. The index minerals in the rock are found in the matrix, therefore, collectively, all the index minerals are the same composition as the parent rock.

Match the rock name with the appropriate label on the diagram:

The letters A through F appear on an image associated with this question.

For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
5.1 phyllite	[hint]

5.2 migmatite	[hint]

5.3 slate	[hint]

5.4 gneiss	[hint]

5.5 schist	[hint]

5.6 shale	[hint]

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